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Journal articles on the topic 'Composition of root exudates'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Zhang, Cheng-Sheng, Yanfen Zheng, Lijuan Peng, and Jianmin Cao. "Rootstock-Scion Interaction Affects the Composition and Pathogen Inhibitory Activity of Tobacco (Nicotiana tabacum L.) Root Exudates." Plants 9, no. 12 (2020): 1652. http://dx.doi.org/10.3390/plants9121652.

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The composition and allelopathy to Phytophthora nicotianae (the causal agent of tobacco black shank disease) of root exudates from a resistant tobacco (Nicotiana tabacum L.) cultivar Gexin 3, a susceptible cultivar Xiaohuangjin 1025 and their reciprocal grafts were investigated. Grafting with disease-resistant rootstock could improve resistance to black shank; this is closely related to the allelopathy of root exudates. The root exudates from the resistant cultivar inhibited the growth of P. nicotianae, while those from the susceptible cultivar promoted the growth; the grafting varieties had i

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2

Broeckling, Corey D., Amanda K. Broz, Joy Bergelson, Daniel K. Manter, and Jorge M. Vivanco. "Root Exudates Regulate Soil Fungal Community Composition and Diversity." Applied and Environmental Microbiology 74, no. 3 (2007): 738–44. http://dx.doi.org/10.1128/aem.02188-07.

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ABSTRACT Plants are in constant contact with a community of soil biota that contains fungi ranging from pathogenic to symbiotic. A few studies have demonstrated a critical role of chemical communication in establishing highly specialized relationships, but the general role for root exudates in structuring the soil fungal community is poorly described. This study demonstrates that two model plant species (Arabidopsis thaliana and Medicago truncatula) are able to maintain resident soil fungal populations but unable to maintain nonresident soil fungal populations. This is mediated largely through

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Carvalhais, Lilia C., Paul G. Dennis, Dayakar V. Badri, Brendan N. Kidd, Jorge M. Vivanco, and Peer M. Schenk. "Linking Jasmonic Acid Signaling, Root Exudates, and Rhizosphere Microbiomes." Molecular Plant-Microbe Interactions® 28, no. 9 (2015): 1049–58. http://dx.doi.org/10.1094/mpmi-01-15-0016-r.

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Jasmonic acid (JA) is an essential hormone in plant development and defense responses in Arabidopsis thaliana. Exogenous treatment with JA has recently been shown to alter root exudate profiles and the composition of root-associated bacterial communities. However, it is currently unknown whether disruptions of the JA in the rhizosphere affect root exudation profiles and the relative abundance of bacteria and archaea in the rhizosphere. In the present study, two Arabidopsis mutants that are disrupted in different branches of the jasmonate pathway, namely myc2 and med25, were cultivated in nutri

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4

Li, Xia, Hai-Jing Hu, Jing-Yu Li, Cong Wang, Shuang-Lin Chen, and Shu-Zhen Yan. "Effects of the Endophytic Bacteria Bacillus cereus BCM2 on Tomato Root Exudates and Meloidogyne incognita Infection." Plant Disease 103, no. 7 (2019): 1551–58. http://dx.doi.org/10.1094/pdis-11-18-2016-re.

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Root-knot nematodes (Meloidogyne spp.) cause serious crop losses worldwide. The colonization of tomato roots by endophytic bacteria Bacillus cereus BCM2 can greatly reduce Meloidogyne incognita damage, and tomato roots carrying BCM2 were repellent to M. incognita second-stage juveniles (J2). Here, the effects of BCM2 colonization on the composition of tomato root exudates was evaluated and potential mechanisms for BCM2-mediated M. incognita control explored using a linked twin-pot assay and GC-MS. On water agar plates, J2 preferentially avoided filter paper treated with tomato root exudates (o

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5

Patchett, Aurora, and Jonathan A. Newman. "Comparison of Plant Metabolites in Root Exudates of Lolium perenne Infected with Different Strains of the Fungal Endophyte Epichloë festucae var. lolii." Journal of Fungi 7, no. 2 (2021): 148. http://dx.doi.org/10.3390/jof7020148.

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Lolium perenne infected with the fungal endophyte Epichloë festucae var. lolii have specific, endophyte strain-dependent, chemical phenotypes in their above-ground tissues. Differences in these chemical phenotypes have been largely associated with classes of fungal-derived alkaloids which protect the plant against many insect pests. However, the use of new methodologies, such as various omic techniques, has demonstrated that many other chemical changes occur in both primary and secondary metabolites. Few studies have investigated changes in plant metabolites exiting the plant in the form of ro

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6

Vieira, Selma, Johannes Sikorski, Sophie Dietz, et al. "Drivers of the composition of active rhizosphere bacterial communities in temperate grasslands." ISME Journal 14, no. 2 (2019): 463–75. http://dx.doi.org/10.1038/s41396-019-0543-4.

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Abstract The active bacterial rhizobiomes and root exudate profiles of phytometers of six plant species growing in central European temperate grassland communities were investigated in three regions located up to 700 km apart, across diverse edaphic conditions and along a strong land use gradient. The recruitment process from bulk soil communities was identified as the major direct driver of the composition of active rhizosphere bacterial communities. Unexpectedly, the effect of soil properties, particularly soil texture, water content, and soil type, strongly dominated over plant properties a

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7

Hromádko, Ladislav, Valerie Vranová, Didier Techer, et al. "Composition of root exudates of Miscanthus × Giganteus Greef et Deu." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, no. 1 (2010): 71–76. http://dx.doi.org/10.11118/actaun201058010071.

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Rate of root exudation and identification of selected compounds in root exudates of Miscanthus × Giganteus in the autumnal period of growth was performed. Total organic carbon of root exudates was formed from 7.8 % by carbohydrates and from 1.5 % by proteins. Aspartic acid, arginine, alanine and glutamic acid were exuded with the highest rate of all amino acids. This work brings new basic knowledge which can be used for phytoremediations.

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8

Marchi, Giuliano, Luiz Roberto Guimarães Guilherme, and Andrew C. Chang. "Plant availability of trace elements in sewage sludge-treated soils: methodology¹." Revista Brasileira de Ciência do Solo 35, no. 4 (2011): 1453–60. http://dx.doi.org/10.1590/s0100-06832011000400039.

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Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg

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9

Dundek, Peter, Ladislav Holík, Ladislav Hromádko, et al. "Action of plant root exudates in bioremediations: a review." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 1 (2011): 303–8. http://dx.doi.org/10.11118/actaun201159010303.

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This work presents a summary of literature dealing with the use of plant root exudates in bioremediations. Bioremediation using plants (phytoremediation or rhizoremediation) and associate rhizosphere to decontaminate polluted soil is a method based on the catabolic potential of root-associated microorganisms, which are supported by the organic substrates released from roots. These substrates are called “root exudates”. Root exudates support metabolism of pollutants-decomposing microorganisms in the rhizosphere, and affect sorption / desorption of pollutants. Awareness of exudation rates is nec

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10

Bozhkov, A. I., M. K. Kovalova, Z. A. Azeez, and А. V. Goltvjansky. "The effect of pre-sowing seed treatment on seedlings growth rate and their excretory activity." Regulatory Mechanisms in Biosystems 11, no. 1 (2020): 60–66. http://dx.doi.org/10.15421/022008.

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The importance of studying pre-sowing seed treatment lies in the possibility of regulating the rate of seed germination, the intensity of their growth and obtaining root exudates in biotechnology. The effect of three pre-sowing treatment methods was examined (control – washing with running water; the first method – washing with 0.05% sodium permanganate solution; the second method – 30 seconds in 70% ethyl alcohol (C2H5OH) and 30 minutes in 5% sodium hypochlorite (NaOCl); the third method – 5 minutes in 70% C2H5OH and 40 minutes in 5% NaOCl) on the growth rate, germination rate, excretion rat

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11

Dormaar, Johan F., Bonnie C. Tovell, and Walter D. Willms. "Fingerprint Composition of Seedling Root Exudates of Selected Grasses." Journal of Range Management 55, no. 4 (2002): 420. http://dx.doi.org/10.2307/4003481.

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12

Li, Xun, Wenying Chu, Jinlong Dong, and Zengqiang Duan. "An Improved High-performance Liquid Chromatographic Method for the Determination of Soluble Sugars in Root Exudates of Greenhouse Cucumber Grown under CO2 Enrichment." Journal of the American Society for Horticultural Science 139, no. 4 (2014): 356–63. http://dx.doi.org/10.21273/jashs.139.4.356.

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This study described a simple and quick method to detect trace quantities of a non-reducing sugar (viz. sucrose) in the root exudates of cucumber (Cucumis sativus) under CO2 enrichment. Sucrose was determined by analyzing fructose and glucose before and after invertase digestion using high-performance liquid chromatography. Using this technique, the optimal hydrolysis condition was 5.00 μg·mL−1 invertase for 10 minutes. The detection limit of ultraviolet-visible detector by post-column derivatization with tetrazolium was 0.25, 0.43, 0.48, and 1.95 μg·mL−1 for fructose, glucose, sucrose, and ma

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13

Lawson, CGR, BG Rolfe, and MA Djordjevic. "Rhizobium Inoculation Induces Condition-Dependent Changes in the Flavonoid Composition of Root Exudates From Trifolium subterraneum." Functional Plant Biology 23, no. 1 (1996): 93. http://dx.doi.org/10.1071/pp9960093.

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Rapid induction of chalcone synthase (predominantly CHSS) gene expression occurs within 6 h following the inoculation of Rhizobium leguminosarum bv. trifolii strain ANU843 on Trifolium subterraneum or wounding of plants (C. G. R. Lawson, M. A. Djordjevic, J. J. Weinman and B. G. Rolfe. 1994. Molecular Plant-Microbe Interactions 7, 498-507). Experiments were conducted under the same conditions to examine the time of onset of synthesis and excretion of flavonoids that might result from this early CHS expression. Flavonoids in root tissues and root exudates were examined by HPLC analysis and the

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14

Vishnevskaya, Nadezhda, Vlada Shakhnazarova, Alexander Shaposhnikov, and Olga Strunnikova. "The Role of Root Exudates of Barley Colonized by Pseudomonas fluorescens in Enhancing Root Colonization by Fusarium culmorum." Plants 9, no. 3 (2020): 366. http://dx.doi.org/10.3390/plants9030366.

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The aim of this study was to find out why after joint inoculation of the substrate with the phytopathogenic fungus Fusarium culmorum and the antagonistic bacterium Pseudomonas fluorescens the amount of the fungus on the root surface in the beginning of the colonization was greater on the roots colonized by the bacterium than on control roots. This phenomenon is especially interesting because joint inoculation with P. fluorescens was always followed by a considerable decrease in the incidence of Fusarium root rot. In two experiments barley was grown in sterile vermiculite inoculated only with F

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15

Tuason, M. M. S., and J. M. Arocena. "Root organic acid exudates and properties of rhizosphere soils of white spruce (Picea glauca) and subalpine fir (Abies lasiocarpa)." Canadian Journal of Soil Science 89, no. 3 (2009): 287–300. http://dx.doi.org/10.4141/cjss08021.

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Rhizosphere processes, such as the production and release of organic acids, contribute to differences in properties between rhizosphere (R) and nonrhizosphere (NR) soils. We compared the organic acid composition/concentrations in the R and NR soil extracts of Picea glauca and Abies lasiocarpa, and in the root exudates of the same tree species. We also evaluated the chemical properties and mineral composition of the soil samples. Higher concentrations of organic acids were observed in R than in NR soils with aliphatic acids predominating in both soil extracts and root exudates. Acetic, formic,

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16

Dundek, Peter, Ladislav Holík, Tomáš Rohlík, et al. "Methods of plant root exudates analysis: a review." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 3 (2011): 241–46. http://dx.doi.org/10.11118/actaun201159030241.

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The aim of this review is to summarise current knowledge on methods being used to determine individual compounds and properties of water-soluble plant root exudates. These compounds include amino acids, organic acids and simple sugars, as well as polysaccharides, proteins and organic substances. Qualitative composition of water-soluble root exudates and exudation rate are commonly measured with the aim of consequent synthetic preparation of plant root exudates to be supplied to soil to create artificial rhizosphere for different experimental purposes. Root exudates collection usually requires

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17

Liu, Na, Baoli Zhou, Xin Zhao, Bo Lu, Yixiu Li, and Jing Hao. "Grafting Eggplant onto Tomato Rootstock to Suppress Verticillium dahliae Infection: The Effect of Root Exudates." HortScience 44, no. 7 (2009): 2058–62. http://dx.doi.org/10.21273/hortsci.44.7.2058.

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Verticillium wilt (caused by Verticillium dahliae), a soilborne disease, often causes significant reductions of yield in eggplant (Solanum melongena L.) production where crop rotation is limited. Rootstock replacement through grafting is considered an effective method to control this disease. This 2-year study investigated the eggplant yield, resistance to verticillium wilt, and allelochemicals in root exudates of eggplant grafted onto a tomato rootstock. Both disease incidence and disease severity on grafted eggplant were markedly lower than those of nongrafted eggplants. Fifteen days after V

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18

Yuan, Hongzhao, Zhenke Zhu, Shoulong Liu, et al. "Microbial utilization of rice root exudates: 13C labeling and PLFA composition." Biology and Fertility of Soils 52, no. 5 (2016): 615–27. http://dx.doi.org/10.1007/s00374-016-1101-0.

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19

Piętka, Danuta, and Elżbieta Patkowska. "Effect of root exudates of various plants on composition of bacteria and fungi communities with special regard to pathogenic soil-borne fungi." Acta Agrobotanica 54, no. 1 (2013): 95–104. http://dx.doi.org/10.5586/aa.2001.009.

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The purpose of the studies conducted in the years 1996 - 1998 was to determine the composition of bacteria and fungi populations in the rhizosphere of winter wheat, spring wheat, soybean and potato, and in non-rhizosphere soil. Besides, the effect of root exudates of these plants on the formation of pathogenic fungi communities was established. The microbiological analysis showed that the greatest tolal number of bacteria was found in the rhizospheres of potato and soybean, and the lowest number in non-rhizosphere soil. The smallest total number of fungi was found in the rhizosphere of winter

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Astolfi, Stefania, Youry Pii, Tanja Mimmo, et al. "Single and Combined Fe and S Deficiency Differentially Modulate Root Exudate Composition in Tomato: A Double Strategy for Fe Acquisition?" International Journal of Molecular Sciences 21, no. 11 (2020): 4038. http://dx.doi.org/10.3390/ijms21114038.

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Fe chlorosis is considered as one of the major constraints on crop growth and yield worldwide, being particularly worse when associated with S shortage, due to the tight link between Fe and S. Plant adaptation to inadequate nutrient availabilities often relies on the release of root exudates that enhance nutrients, mobilization from soil colloids and favour their uptake by roots. This work aims at characterizing the exudomic profile of hydroponically grown tomato plants subjected to either single or combined Fe and S deficiency, as well as at shedding light on the regulation mechanisms underly

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Jofré, Edgardo, Viviana Rivarola, Héctor Balegno, and Gladys Mori. "Differential gene expression in Azospirillum brasilense Cd under saline stress." Canadian Journal of Microbiology 44, no. 10 (1998): 929–36. http://dx.doi.org/10.1139/w98-078.

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Previous studies in our laboratory demonstrated that the attachment of Azospirillum brasilense Cd to maize and wheat roots was altered when the bacteria were grown under saline stress. The aim of this work was to analyze the interaction when either the plant or both components were exposed to saline conditions. We demonstrated that this stress altered the early stages of development, in this plant model, leading to an inadequate colonization. The effect of saline stress on the expression of A. brasilense N2 fixation gene promoters was also studied. While nifA expression was increased in stress

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Bouhaouel, Imen, Gaëtan Richard, Marie-Laure Fauconnier, et al. "Identification of Barley (Hordeum vulgare L. subsp. vulgare) Root Exudates Allelochemicals, Their Autoallelopathic Activity and Against Bromus diandrus Roth. Germination." Agronomy 9, no. 7 (2019): 345. http://dx.doi.org/10.3390/agronomy9070345.

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Crops with weed suppressive root exudates or the direct use of bioherbicidal allelochemicals is a new approach in integrated weed management systems. In this context, the allelopathic activity and chemical composition of root exudates from six genotypes (modern varieties and landraces) of barley were characterized. The phenolic acids appeared to be particularly implicated in the inhibitory action of barley root exudates against Bromus diandrus. The amount of these compounds was higher in sandy substrate than in sandy-clay-loam substrate. Ten phenolic acids and one phenylpropanoid derivative we

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Kareem, Zana Jamal, Ling Su, Anna Rathgeb, et al. "Small-Scale Bioreactor for Sterile Hydroponics and Hairy Roots: Metabolic Diversity and Salicylic Acid Exudation by Hairy Roots of Hyoscyamus niger." Applied Sciences 9, no. 15 (2019): 3044. http://dx.doi.org/10.3390/app9153044.

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The volume and complexity of commercial bioreactors for sterile hydroponics and hairy roots are too large for comparative analysis of many cultures. Here a small-scale bioreactor fabricated from standard glass materials and suitable for both airlift and bubble aeration mode is described. The performance of the bioreactor was tested by growing oilseed rape (Brassica napus L.) and rose plants (Rosa canina L.) in sterile hydroponics and by cultivating hairy roots of henbane (Hyoscyamus niger L.) and sesame (Hyoscyamus niger L.). Plants grown in hydroponics for up to six weeks did not show chloros

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Potysz, Anna, and Jakub Kierczak. "Dissolution of lead matte and copper slag upon exposure to rhizosphere-like conditions." Geoscience Records 4, no. 1 (2017): 21–32. http://dx.doi.org/10.1515/georec-2017-0003.

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Abstract Metallurgical wastes displaying various chemical and mineralogical properties may reveal different behaviour under exposure to weathering conditions. The latter impact the stability of the wastes, which often results in metal release and subsequent pollution problems. The aim of this study was to compare the weathering of two types of metallurgical wastes (i.e., copper slag and lead matte) exposed to artificial root exudates organic solutions and demineralized water. The results of experimental weathering demonstrated that the extent of waste dissolution depends on the composition of

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Kamilova, Faina, Lev V. Kravchenko, Alexander I. Shaposhnikov, Tatiyana Azarova, Nataliya Makarova, and Ben Lugtenberg. "Organic Acids, Sugars, and l-Tryptophane in Exudates of Vegetables Growing on Stonewool and Their Effects on Activities of Rhizosphere Bacteria." Molecular Plant-Microbe Interactions® 19, no. 3 (2006): 250–56. http://dx.doi.org/10.1094/mpmi-19-0250.

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The influence of stonewool substrate on the exudation of the major soluble carbon nutrients and of the auxin precursor tryptophane for Pseudomonas biocontrol agents was studied. To this end, the composition of the organic acids and sugars, as well that of tryptophane, of axenically collected exudates of seed, seedlings, and roots of tomato, cucumber, and sweet pepper was determined. The major results were as follows. i) The total amount of organic acid is much higher than that of total sugar. ii) Exudation of both organic acids and sugars increases during plant growth. iii) Citric, succinic, a

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Lombardi, Nadia, Stefania Vitale, David Turrà, et al. "Root Exudates of Stressed Plants Stimulate and Attract Trichoderma Soil Fungi." Molecular Plant-Microbe Interactions® 31, no. 10 (2018): 982–94. http://dx.doi.org/10.1094/mpmi-12-17-0310-r.

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Plant roots release complex mixtures of bioactive molecules, including compounds that affect the activity and modify the composition of the rhizosphere microbiome. In this work, we investigated the initial phase of the interaction between tomato and an effective biocontrol strain of Trichoderma harzianum (T22). We found that root exudates (RE), obtained from plants grown in a split-root system and exposed to various biotic and abiotic stress factors (wounding, salt, pathogen attack), were able to stimulate the growth and act as chemoattractants of the biocontrol fungus. On the other hand, some

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Roesti, David, Kurt Ineichen, Olivier Braissant, Dirk Redecker, Andres Wiemken, and Michel Aragno. "Bacteria Associated with Spores of the Arbuscular Mycorrhizal Fungi Glomus geosporum and Glomus constrictum." Applied and Environmental Microbiology 71, no. 11 (2005): 6673–79. http://dx.doi.org/10.1128/aem.71.11.6673-6679.2005.

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ABSTRACT Spores of the arbuscular mycorrhizal fungi (AMF) Glomus geosporum and Glomus constrictum were harvested from single-spore-derived pot cultures with either Plantago lanceolata or Hieracium pilosella as host plants. PCR-denaturing gradient gel electrophoresis analysis revealed that the bacterial communities associated with the spores depended more on AMF than host plant identity. The composition of the bacterial populations linked to the spores could be predominantly influenced by a specific spore wall composition or AMF exudate rather than by specific root exudates. The majority of the

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Miller, Sarah B., Adam L. Heuberger, Corey D. Broeckling, and Courtney E. Jahn. "Non-Targeted Metabolomics Reveals Sorghum Rhizosphere-Associated Exudates are Influenced by the Belowground Interaction of Substrate and Sorghum Genotype." International Journal of Molecular Sciences 20, no. 2 (2019): 431. http://dx.doi.org/10.3390/ijms20020431.

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Root exudation is an important plant process by which roots release small molecules into the rhizosphere that serve in overall plant functioning. Yet, there is a major gap in our knowledge in translating plant root exudation in artificial systems (i.e., hydroponics, sterile media) to crops, specifically for soils expected in field conditions. Sorghum (Sorghum bicolor L. Moench) root exudation was determined using both ultra-performance liquid chromatography and gas chromatography mass spectrometry-based non-targeted metabolomics to evaluate variation in exudate composition of two sorghum genot

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Kaňová, Hana, Joffrey Carre, Valerie Vranová, Klement Rejšek, and Pavel Formánek. "Organic compounds in root exudates of Miscanthus × Giganteus greef et deu and limitation of microorganisms in its rhizosphere by nutrients." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, no. 5 (2010): 203–8. http://dx.doi.org/10.11118/actaun201058050203.

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This study was conducted to determine the composition of sugars and organic acids in root exudates of Miscanthus × Giganteus and to find out if microorganisms of the rhizospheric soil are limited by mineral nutrients. The following sugars and organic acids were determined in root exudates of this plant: glucose, saccharose, and acids such as succinic, propionic, citric, tartaric, malic, oxalic, ascorbic, acetic and fumaric. Respiration of soil from rhizosphere of Miscanthus × Giganteus was found to be limited by N, K and Ca. Respiration rate after application of mineral compounds increased i

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Ren, Lixuan, Ning Zhang, Ping Wu, Hongwei Huo, Guohua Xu, and Guoping Wu. "Arbuscular mycorrhizal colonization alleviates Fusarium wilt in watermelon and modulates the composition of root exudates." Plant Growth Regulation 77, no. 1 (2015): 77–85. http://dx.doi.org/10.1007/s10725-015-0038-x.

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Lv, Jiaxing, Yan Dong, Kun Dong, Qian Zhao, Zhixian Yang, and Ling Chen. "Intercropping with wheat suppressed Fusarium wilt in faba bean and modulated the composition of root exudates." Plant and Soil 448, no. 1-2 (2020): 153–64. http://dx.doi.org/10.1007/s11104-019-04413-2.

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Lünsmann, Vanessa, Uwe Kappelmeyer, Anja Taubert, et al. "Aerobic Toluene Degraders in the Rhizosphere of a Constructed Wetland Model Show Diurnal Polyhydroxyalkanoate Metabolism." Applied and Environmental Microbiology 82, no. 14 (2016): 4126–32. http://dx.doi.org/10.1128/aem.00493-16.

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ABSTRACTConstructed wetlands (CWs) are successfully applied for the treatment of waters contaminated with aromatic compounds. In these systems, plants provide oxygen and root exudates to the rhizosphere and thereby stimulate microbial degradation processes. Root exudation of oxygen and organic compounds depends on photosynthetic activity and thus may show day-night fluctuations. While diurnal changes in CW effluent composition have been observed, information on respective fluctuations of bacterial activity are scarce. We investigated microbial processes in a CW model system treating toluene-co

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Ovtsyna, Alexandra O., Geert-Jan Rademaker, Edwin Esser, et al. "Comparison of Characteristics of the nodX Genes from Various Rhizobium leguminosarum Strains." Molecular Plant-Microbe Interactions® 12, no. 3 (1999): 252–58. http://dx.doi.org/10.1094/mpmi.1999.12.3.252.

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We have analyzed the nucleotide sequences of the nodX genes from two strains of Rhizobium leguminosarum bv. viciae able to nodulate Afghan peas (strains A1 and Himalaya) and from two strains of R. leguminosarum bv. trifolii (ANU843 and CSF). The nodX genes of strains A1 and ANU843 were shown to be functional for the induction of nodules on Afghan peas. To analyze the cause of phenotypic differences of strain A1 and strain TOM we have studied the composition of the lipochitin-oligosaccharides (LCOs) produced by strain A1 after induction by the flavonoid naringenin or various pea root exudates.

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Toropova, E. Yu, I. G. Vorobyova, R. I. Trunov, and V. V. Piskarev. "CONSORTS MONITORING IN ECOSYSTEM: PLANT – PHYTOPATHOGENS – SOIL SAPROTROPHES." Ecology. Economy. Informatics.System analysis and mathematical modeling of ecological and economic systems 1, no. 5 (2020): 192–95. http://dx.doi.org/10.23885/2500-395x-2020-1-5-192-195.

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Monitoring studies were carried out according to generally accepted methods in the northern forest-steppe of West Siberia in 2019–2020, using the varieties collection of the Institute of Cytology and Genetics SB RAS. Studies have shown that the genotypes of spring wheat varieties had a significant impact on the functioning of the “plant-phytopathogensaprotrophs” system. The parasitic activity of phytopathogens (Bipolaris sorokiniana Sacc. Shoem., Fusarium spp. Link.) differed in the varietal groups to 43.6 %. Varieties of Asian origin (China, India, Kazakhstan, Syria) were most affected by the

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Fischer, Sonia Elizabeth, Marioli Juan Miguel, and Gladys Beatriz Mori. "Effect of root exudates on the exopolysaccharide composition and the lipopolysaccharide profile ofAzospirillum brasilenseCd under saline stress." FEMS Microbiology Letters 219, no. 1 (2003): 53–62. http://dx.doi.org/10.1016/s0378-1097(02)01194-1.

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Kosyan, A., O. Smirnov, N. Taran, and V. Burdyga. "TEST SYSTEM BASED ON ROOT EXUDATES FOR HIGH-YIELDING COMMON BUCKWHEAT ( FAGOPYRUM ESCULENTUM MOENCH.) FORM SCREENING." Bulletin of Taras Shevchenko National University of Kyiv. Series: Biology 72, no. 2 (2016): 71–75. http://dx.doi.org/10.17721/1728_2748.2016.72.71-75.

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A new effective non-invasive method of screening of highly productive forms of buckwheat sowing (Fagopyrum esculentum Moench.) based on rapid testing of buckwheat seedling intensity exudation of organic acids root system in the laboratory is offered. Buckwheat seeds were germinated on agar gel layer which contains in its composition acid-base indicator followed by visual assessment of the indicator color changes around primary root and plants with the largest area of color change were selected. The effectiveness of the method was confirmed in the field conditions by phenotyping of plants and s

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Zhang, Xuechen, Michaela A. Dippold, Yakov Kuzyakov, and Bahar S. Razavi. "Spatial pattern of enzyme activities depends on root exudate composition." Soil Biology and Biochemistry 133 (June 2019): 83–93. http://dx.doi.org/10.1016/j.soilbio.2019.02.010.

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Bremer, Christina, Gesche Braker, Diethart Matthies, Andreas Reuter, Christof Engels, and Ralf Conrad. "Impact of Plant Functional Group, Plant Species, and Sampling Time on the Composition of nirK-Type Denitrifier Communities in Soil." Applied and Environmental Microbiology 73, no. 21 (2007): 6876–84. http://dx.doi.org/10.1128/aem.01536-07.

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ABSTRACT We studied the influence of eight nonleguminous grassland plant species belonging to two functional groups (grasses and forbs) on the composition of soil denitrifier communities in experimental microcosms over two consecutive years. Denitrifier community composition was analyzed by terminal restriction fragment length polymorphism (T-RFLP) of PCR-amplified nirK gene fragments coding for the copper-containing nitrite reductase. The impact of experimental factors (plant functional group, plant species, sampling time, and interactions between them) on the structure of soil denitrifier co

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Yang, Ching-Hong, and David E. Crowley. "Rhizosphere Microbial Community Structure in Relation to Root Location and Plant Iron Nutritional Status." Applied and Environmental Microbiology 66, no. 1 (2000): 345–51. http://dx.doi.org/10.1128/aem.66.1.345-351.2000.

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ABSTRACT Root exudate composition and quantity vary in relation to plant nutritional status, but the impact of the differences on rhizosphere microbial communities is not known. To examine this question, we performed an experiment with barley (Hordeum vulgare) plants under iron-limiting and iron-sufficient growth conditions. Plants were grown in an iron-limiting soil in root box microcosms. One-half of the plants were treated with foliar iron every day to inhibit phytosiderophore production and to alter root exudate composition. After 30 days, the bacterial communities associated with differen

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Gent, Martin P. N., Zakia D. Parrish, and Jason C. White. "Nutrient Uptake among Subspecies of Cucurbita pepo L. Is Related to Exudation of Citric Acid." Journal of the American Society for Horticultural Science 130, no. 5 (2005): 782–88. http://dx.doi.org/10.21273/jashs.130.5.782.

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Exudation of organic acids by roots has been implicated in uptake of minerals from soil. Three cultivars within each of two subspecies of summer squash (Cucurbita pepo ssp. ovifera D. S. Decker var. ovifera and C. pepo ssp. pepo var. pepo) were grown in the field. Plants of ssp. pepo had higher concentrations of K, P, and Zn than those of ssp. ovifera. These same cultivars were grown under P sufficient and depleted conditions in hydroponics, to measure exudation of organic acids from roots. When grown in hydroponics, tissues of ssp. ovifera had similar or higher concentrations of nutrients tha

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Chaboud, Annie, and Mireille Rougier. "Effect of Root Density in Incubation Medium on Root Exudate Composition of Axenic Maize Seedlings." Journal of Plant Physiology 137, no. 5 (1991): 602–6. http://dx.doi.org/10.1016/s0176-1617(11)80706-6.

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Wang, Dan, Jun Fan Fu, Ru Jun Zhou, Zi Bo Li, and Yu Jiao Xie. "Proteomics research and related functional classification of liquid sclerotial exudates of Sclerotinia ginseng." PeerJ 5 (October 31, 2017): e3979. http://dx.doi.org/10.7717/peerj.3979.

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Sclerotinia ginseng is a necrotrophic soil pathogen that mainly infects the root and basal stem of ginseng, causing serious commercial losses. Sclerotia, which are important in the fungal life cycle, are hard, asexual, resting structures that can survive in soil for several years. Generally, sclerotium development is accompanied by the exudation of droplets. Here, the yellowish droplets of S. ginseng were first examined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and the proteome was identified by a combination of different analytical platforms. A total of 59 proteins were id

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Bowsher, Alan W., Rifhat Ali, Scott A. Harding, Chung-Jui Tsai, and Lisa A. Donovan. "Evolutionary Divergences in Root Exudate Composition among Ecologically-Contrasting Helianthus Species." PLOS ONE 11, no. 1 (2016): e0148280. http://dx.doi.org/10.1371/journal.pone.0148280.

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Kanbar, Hussein Jaafar, Zeinab Matar, Ghina Abed-AlHadi Safa, and Veronique Kazpard. "Selective metal leaching from technosols based on synthetic root exudate composition." Journal of Environmental Sciences 96 (October 2020): 85–92. http://dx.doi.org/10.1016/j.jes.2020.04.040.

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Xie, En, Xuejing Wei, Aizhong Ding, Lei Zheng, Xiaona Wu, and Bruce Anderson. "Short-Term Effects of Salt Stress on the Amino Acids of Phragmites australis Root Exudates in Constructed Wetlands." Water 12, no. 2 (2020): 569. http://dx.doi.org/10.3390/w12020569.

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In this study, the short-term effects of NaCl stress on the free amino acid content and composition of root exudates of Phragmites australis were evaluated. Nineteen amino acid types were detected in all samples. The results indicated that NaCl significantly influenced the total amino acid (TotAA) content. The TotAA content at 6‰ salinity (1098.79 μM g−1 DW) was up to 24 times higher than that in the control group (45.97 μM g−1 DW) but decreased to 106.32 μM g−1 DW at 6‰ salinity in the first hour. The stress period also significantly affected the TotAA content. After 4 h of stress, the TotAA

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Li, Xiao-gang, Tao-lin Zhang, Xing-xiang Wang, Ke Hua, Ling Zhao, and Zheng-min Han. "The Composition of Root Exudates from Two Different Resistant Peanut Cultivars and Their Effects on the Growth of Soil-Borne Pathogen." International Journal of Biological Sciences 9, no. 2 (2013): 164–73. http://dx.doi.org/10.7150/ijbs.5579.

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Centofanti, Tiziana, Zehra Sayers, Maria Isabel Cabello-Conejo, et al. "Xylem exudate composition and root-to-shoot nickel translocation in Alyssum species." Plant and Soil 373, no. 1-2 (2013): 59–75. http://dx.doi.org/10.1007/s11104-013-1782-1.

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Zhou, Chengbo, Yubin Zhang, Wenke Liu, Lingyan Zha, Mingjie Shao, and Baoshi Li. "Light Quality Affected the Growth and Root Organic Carbon and Autotoxin Secretions of Hydroponic Lettuce." Plants 9, no. 11 (2020): 1542. http://dx.doi.org/10.3390/plants9111542.

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Light is a crucial environmental signal and photosynthetic energy for plant growth, development, and primary and secondary metabolism. To explore the effects of light quality on the growth and root exudates of hydroponic lettuce (Lactuca sativa L.), white LED (W, control) and four the mixtures of red (R) and blue (B) LED with different R/B light intensity ratios (R/B = 2, 2R1B; R/B = 3, 3R1B; R/B = 4, 4R1B; and R/B = 8, 8R1B) were designed. The results showed that the biomass of lettuce under 8R1B and W treatments was higher than that under other light quality treatments. The photosynthetic ra

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Meinzer, FC, DA Grantz, and B. Smit. "Root Signals Mediate Coordination of Stomatal and Hydraulic Conductance in Growing Sugarcane." Functional Plant Biology 18, no. 4 (1991): 329. http://dx.doi.org/10.1071/pp9910329.

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Root hydraulic conductance and total stomatal conductance on a per plant basis changed in parallel during growth of sugarcane. Changes in root system water and solute transport properties were evaluated to determine the role of changes in root xylem sap composition in this coordination of vapour and liquid phase conductances. Stomatal conductance of excised leaf strips supplied with root exudate declined with increasing leaf area of the exudate donor plants. Leaf strips from plants of different sizes responded similarly to exudate from each donor plant, indicating that there were no inherent d

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Sirová, Dagmara, Jakub Borovec, Tomáš Picek, Lubomír Adamec, Linda Nedbalová, and Jaroslav Vrba. "Ecological implications of organic carbon dynamics in the traps of aquatic carnivorous Utricularia plants." Functional Plant Biology 38, no. 7 (2011): 583. http://dx.doi.org/10.1071/fp11023.

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Rootless aquatic carnivorous Utricularia exude up to 25% of their photosynthates into the trap lumen, which also harbours a complex microbial community thought to play a role in enhancing Utricularia nutrient acquisition. We investigated the composition of organic carbon in the trap fluid, its availability for microbial uptake, the influence of plant nutrient status and trap age on its biodegradability, and the composition of prokaryotic assemblages within the traps of three aquatic Utricularia species. Using ion chromatography and basal respiration rate measurements we confirmed that up to 30

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