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Journal articles on the topic 'Rhizosphere competence'

Author: Grafiati
Published: 4 June 2021
Last updated: 24 July 2025

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1

Ahmad, Jaleed S. "Rhizosphere Competence ofTrichoderma harzianum." Phytopathology 77, no. 2 (1987): 182. http://dx.doi.org/10.1094/phyto-77-182.

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2

Al-Rawahi, A. K., and J. G. Hancock. "Rhizosphere Competence of Pythium oligandrum." Phytopathology® 87, no. 9 (1997): 951–59. http://dx.doi.org/10.1094/phyto.1997.87.9.951.

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The associations of Pythium oligandrum with the root cortex, rhizoplane, and rhizosphere were measured with 11 crop species. This work was expedited by the use of a semiselective technique for isolation of P. oligandrum from soil and plant material. Cortical colonization of roots by P. oligandrum was not detected, and the rhizoplanes of the roots of most crops were free of the fungus. However, P. oligandrum was detected in large quantities with every crop tested when roots with adhering soil (rhizosphere soil) were assayed. Different crop species and cultivars of cantaloupe, cauliflower, and t
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3

Ahmad, Jaleed S., and Ralph Baker. "Implications of rhizosphere competence of Trichoderma harzianum." Canadian Journal of Microbiology 34, no. 3 (1988): 229–34. http://dx.doi.org/10.1139/m88-043.

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Seed treatment with conidia of rhizosphere-competent mutants of Trichoderma harzianum reduced the incidence of preemergence damping-off of barley, cucumber, pea, radish, and tomato induced by Pythium ultimum. Wild-type parents of these mutants were less effective in control. When rhizosphere-competent mutants were applied to seed or when a peat-bran preparation was added to soil, the resulting plants produced significantly higher fruit weight and higher dry weights than those treated with rhizosphere-incompetent wild types and controls. Seed treatment with mutants increased the incidence of em
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4

Ahmad, Jaleed S., and Ralph Baker. "Rhizosphere competence of benomyl-tolerant mutants of Trichoderma spp." Canadian Journal of Microbiology 34, no. 5 (1988): 694–96. http://dx.doi.org/10.1139/m88-116.

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Two strains of Trichoderma harzianum and one each of T. koningii, T. polysporum, and T. viride were mutated for tolerance to the fungicide benomyl. Rhizosphere competence index of several mutants of each strain and species was determined by the rhizosphere competence assay. Most of the mutants and not their wild type parents were rhizosphere competent. When the strains and species were grown in Czapek–Dox broth for 6 days with cellulose as sole carbon source, the mutants produced significantly higher dry weight than their parent wild types. Neither the mutants nor the wild types produced bioma
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5

Ocamb, Cynthia M. "Rhizosphere Competence ofFusariumSpecies Colonizing Corn Roots." Phytopathology 84, no. 2 (1994): 166. http://dx.doi.org/10.1094/phyto-84-166.

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6

Hozore, Elissa, and Martin Alexander. "Bacterial characteristics important to rhizosphere competence." Soil Biology and Biochemistry 23, no. 8 (1991): 717–23. http://dx.doi.org/10.1016/0038-0717(91)90140-f.

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7

Raaijmakers, Jos M., Lentse van der Sluis, Peter A. H. M. Bakker, Bob Schippers, Margot Koster, and Peter J. Weisbeek. "Utilization of heterologous siderophores and rhizosphere competence of fluorescent Pseudomonas spp." Canadian Journal of Microbiology 41, no. 2 (1995): 126–35. http://dx.doi.org/10.1139/m95-017.

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In this study, the potential of different Pseudomonas strains to utilize heterologous siderophores was compared with their competitiveness in the rhizosphere of radish. This issue was investigated in interactions between Pseudomonas putida WCS358 and Pseudomonas fluoresceins WCS374 and in interactions between strain WCS358 and eight indigenous Pseudomonas strains capable of utilizing pseudobactin 358. During four successive plant growth cycles of radish, strain WCS358 significantly reduced rhizosphere population densities of the wild-type strain WCS374 by up to 30 times, whereas derivative str
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8

Jjemba, P. K., and Martin Alexander. "Possible determinants of rhizosphere competence of bacteria." Soil Biology and Biochemistry 31, no. 4 (1999): 623–32. http://dx.doi.org/10.1016/s0038-0717(98)00168-0.

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9

Dheeman, Shrivardhan, Nitin Baliyan, Ramesh Chandra Dubey, Dinesh Kumar Maheshwari, Sandeep Kumar, and Lei Chen. "Combined effects of rhizo-competitive rhizosphere and non-rhizosphere Bacillus in plant growth promotion and yield improvement of Eleusine coracana (Ragi)." Canadian Journal of Microbiology 66, no. 2 (2020): 111–24. http://dx.doi.org/10.1139/cjm-2019-0103.

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This study emphasizes the beneficial role of rhizo-competitive Bacillus spp. isolated from rhizospheric and non-rhizospheric soil in plant growth promotion and yield improvement via nitrogen fixation and biocontrol of Sclerotium rolfsii causing foot rot disease in Eleusine coracana (Ragi). The selection of potent rhizobacteria was based on plant-growth-promoting attributes using Venn set diagram and Bonitur scale. Bacillus pumilus MSTA8 and Bacillus amyloliquefaciens MSTD26 were selected because they were effective in root colonization, rhizosphere competence, and biofilm formation using root
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10

Pathania, Priyanka, Ranjana Bhatia, and Madhu Khatri. "Cross-competence and affectivity of maize rhizosphere bacteria Bacillus sp. MT7 in tomato rhizosphere." Scientia Horticulturae 272 (October 2020): 109480. http://dx.doi.org/10.1016/j.scienta.2020.109480.

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11

Bankhead, Stacey Blouin, Linda S. Thomashow, and David M. Weller. "Rhizosphere Competence of Wild-Type and Genetically Engineered Pseudomonas brassicacearum Is Affected by the Crop Species." Phytopathology® 106, no. 6 (2016): 554–61. http://dx.doi.org/10.1094/phyto-09-15-0244-r.

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2,4-Diacetylphloroglucinol (2,4-DAPG)-producing Pseudomonas brassicacearum Q8r1-96 is a highly effective biocontrol agent of take-all disease of wheat. Strain Z30-97, a recombinant derivative of Q8r1-96 containing the phzABCDEFG operon from P. synxantha (formerly P. fluorescens) 2-79 inserted into its chromosome, also produces phenazine-1-carboxylic acid. Rhizosphere population sizes of Q8r1-96, Z30-97, and 2-79, introduced into the soil, were assayed during successive growth cycles of barley, navy bean, or pea under controlled conditions as a measure of the impact of crop species on rhizosphe
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12

Mavrodi, D. V., O. V. Mavrodi, B. B. McSpadden-Gardener, B. B. Landa, D. M. Weller, and L. S. Thomashow. "Identification of Differences in Genome Content among phlD-Positive Pseudomonas fluorescens Strains by Using PCR-Based Subtractive Hybridization." Applied and Environmental Microbiology 68, no. 10 (2002): 5170–76. http://dx.doi.org/10.1128/aem.68.10.5170-5176.2002.

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ABSTRACT Certain 2,4-diacetylphloroglucinol-producing strains of Pseudomonas fluorescens colonize roots and suppress soilborne diseases more effectively than others from which they are otherwise phenotypically almost indistinguishable. We recovered DNA fragments present in the superior colonizer P. fluorescens Q8r1-96 but not in the less rhizosphere-competent strain Q2-87. Of the open reading frames in 32 independent Q8r1-96-specific clones, 1 was similar to colicin M from Escherichia coli, 3 resembled known regulatory proteins, and 28 had no significant match with sequences of known function.
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13

Landa, Blanca B., Dmitri M. Mavrodi, Linda S. Thomashow, and David M. Weller. "Interactions Between Strains of 2,4-Diacetylphloroglucinol-Producing Pseudomonas fluorescens in the Rhizosphere of Wheat." Phytopathology® 93, no. 8 (2003): 982–94. http://dx.doi.org/10.1094/phyto.2003.93.8.982.

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Strains of fluorescent Pseudomonas spp. that produce the antibiotic 2,4-diacetylphoroglucinol (2,4-DAPG) are among the most effective rhizobacteria controlling diseases caused by soilborne pathogens. The genotypic diversity that exists among 2,4-DAPG producers can be exploited to improve rhizosphere competence and biocontrol activity. Knowing that D-genotype 2,4-DAPG-producing strains are enriched in some take-all decline soils and that P. fluorescens Q8r1-96, a representative D-genotype strain, as defined by whole-cell repetitive sequence-based polymerase chain reaction (rep-PCR) with the BOX
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14

Pava-Ripoll, Monica, Claudia Angelini, Weiguo Fang, Sibao Wang, Francisco J. Posada, and Raymond St Leger. "The rhizosphere-competent entomopathogen Metarhizium anisopliae expresses a specific subset of genes in plant root exudate." Microbiology 157, no. 1 (2011): 47–55. http://dx.doi.org/10.1099/mic.0.042200-0.

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Metarhizium anisopliae and Beauveria bassiana are ubiquitous insect pathogens and possible plant symbionts, as some strains are endophytic or colonize the rhizosphere. We evaluated 11 strains of M. anisopliae and B. bassiana, and two soil saprophytes (the non-rhizospheric Aspergillus niger and the rhizosphere-competent Trichoderma harzianum) for their ability to germinate in bean root exudates (REs). Our results showed that some generalist strains of M. anisopliae were as good at germinating in RE as T. harzianum, although germination rates of the specialized acridid pathogen Metarhizium acrid
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15

Kolton, Max, Omer Frenkel, Yigal Elad, and Eddie Cytryn. "Potential Role of Flavobacterial Gliding-Motility and Type IX Secretion System Complex in Root Colonization and Plant Defense." Molecular Plant-Microbe Interactions® 27, no. 9 (2014): 1005–13. http://dx.doi.org/10.1094/mpmi-03-14-0067-r.

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Members of the Flavobacterium genus are often highly abundant in the rhizosphere. Nevertheless, the physiological characteristics associated with their enhanced rhizosphere competence are currently an enigma. Flavobacteria possess a unique gliding-motility complex that is tightly associated with a recently characterized Bacteroidetes-specific type IX protein secretion system, which distinguishes them from the rest of the rhizosphere microbiome. We hypothesize that proper functionality of this complex may confer a competitive advantage in the rhizosphere. To test this hypothesis, we constructed
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16

El-Tarabily, Khaled A. "Rhizosphere-competent isolates of streptomycete and non-streptomycete actinomycetes capable of producing cell-wall-degrading enzymes to controlPythium aphanidermatumdamping-off disease of cucumber." Canadian Journal of Botany 84, no. 2 (2006): 211–22. http://dx.doi.org/10.1139/b05-153.

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Fifty-eight streptomycete and 35 non-streptomycete actinomycetes were isolated from cucumber rhizosphere soil. These isolates were screened for the production of cell-wall-degrading enzymes using mycelial ( Pythium aphanidermatum (Edson) Fitzp.) fragment agar. Eighteen promising isolates were screened for their competence as root colonizers. Eight isolates showing exceptional rhizosphere competence significantly inhibited, in vitro, P. aphanidermatum, the causal agent of postemergence damping-off of cucumber ( Cucumis sativus L.) seedlings. The four most inhibitory isolates ( Actinoplanes phil
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17

Adesina, Modupe F., Rita Grosch, Antje Lembke, Tzenko D. Vatchev, and Kornelia Smalla. "In vitro antagonists of Rhizoctonia solani tested on lettuce: rhizosphere competence, biocontrol efficiency and rhizosphere microbial community response." FEMS Microbiology Ecology 69, no. 1 (2009): 62–74. http://dx.doi.org/10.1111/j.1574-6941.2009.00685.x.

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18

Sivan, A., and G. E. Harman. "Improved rhizosphere competence in a protoplast fusion progeny of Trichoderma harzianum." Journal of General Microbiology 137, no. 1 (1991): 23–29. http://dx.doi.org/10.1099/00221287-137-1-23.

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19

Cripps-Guazzone, N., H. J. Ridgway, L. M. Condron, K. L. McLean, A. Stewart, and E. E. Jones. "Isolate and plant host specificity of rhizosphere competence in Trichoderma species." Fungal Biology 129, no. 3 (2025): 101554. https://doi.org/10.1016/j.funbio.2025.101554.

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20

Lettice, Eoin P., and Peter W. Jones. "Evaluation of rhizobacterial colonisation and the ability to induce Globodera pallida hatch." Nematology 17, no. 2 (2015): 203–12. http://dx.doi.org/10.1163/15685411-00002863.

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Three bacterial isolates, SB13 (Acinetobacter sp.), SB14 (Arthrobacter sp.) and SB15 (Bacillus sp.), were previously isolated from the rhizosphere of sugar beet (Beta vulgaris ssp. vulgaris) plants and shown to increase hatch of potato cyst nematodes in vitro. In this study, the three isolates were assayed for rhizosphere competence. Each isolate was applied to seeds at each of four concentrations (105-108 CFU ml−1) and the inoculated seeds were planted in plastic microcosms containing coarse sand. All three isolates were shown to colonise the rhizosphere, although to differing degrees, with t
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21

Carvalho, Daniel Diego Costa, Sueli Corrêa Marques de Mello, Murillo Lobo Júnior, and Alaerson Maia Geraldine. "Biocontrol of seed pathogens and growth promotion of common bean seedlings by Trichoderma harzianum." Pesquisa Agropecuária Brasileira 46, no. 8 (2011): 822–28. http://dx.doi.org/10.1590/s0100-204x2011000800006.

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The objective of this work was to evaluate isolates of Trichoderma harzianum regarding biocontrol of common bean seed-borne pathogens, plant growth promotion, and rhizosphere competence. Five isolates of T. harzianum were evaluated and compared with commercial isolate (Ecotrich), Carboxin+Thiram, and an absolute control. Bean seeds of the cultivar Jalo Precoce, contaminated with Aspergillus, Cladosporium, and Sclerotinia sclerotiorum, were microbiolized with antagonists, and seed health tests were carried out. Isolates were evaluated on autoclaved substrate and in field conditions. Ten days af
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22

Ahmad, Jaleed S., and Ralph Baker. "Growth of rhizosphere-competent mutants of Trichoderma harzianum on carbon substrates." Canadian Journal of Microbiology 34, no. 6 (1988): 807–14. http://dx.doi.org/10.1139/m88-137.

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When the strains of Trichoderma harzianum were grown in Czapek-Dox broth without saccharose with cotton linters, microcrystalline cellulose, wood cellulose, or xylan as a sole source of carbon, the rhizosphere-competent mutants produced significantly higher biomass than the rhizosphere-incompetent wild types. Both mutants and wild types did not readily grow on glucose, galactose, cellobiose, or xylose as sole source of carbon. The mutants, T-95 and T-12B, produced significantly higher biomass when grown on complex carbohydrates with added simple sugars. The wild types did not produce significa
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23

Milus, Eugene A., and Craig S. Rothrock. "Rhizosphere colonization of wheat by selected soil bacteria over diverse environments." Canadian Journal of Microbiology 39, no. 3 (1993): 335–41. http://dx.doi.org/10.1139/m93-047.

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The ability to colonize the rhizosphere is essential for bacteria to function as biological control agents for soil-borne plant pathogens. Eight bacterial strains reported to colonize wheat roots, inhibit root pathogens, and (or) improve wheat growth and yield were applied to wheat seeds that were planted in fumigated and nonfumigated soil in the 1990 and 1991 growing seasons at two locations in Arkansas. Rhizosphere population sizes were highly correlated with population sizes on seeds. Bacillus subtilis strain D-39Sr colonized roots as well in nonfumigated as in fumigated soil, and the other
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24

Bach, Evelise, Guilherme Dubal dos Santos Seger, Gabriela de Carvalho Fernandes, Bruno Brito Lisboa, and Luciane Maria Pereira Passaglia. "Evaluation of biological control and rhizosphere competence of plant growth promoting bacteria." Applied Soil Ecology 99 (March 2016): 141–49. http://dx.doi.org/10.1016/j.apsoil.2015.11.002.

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25

Ghiglione, Jean-Fran�ois, Fran�ois Gourbiere, Patrick Potier, Laurent Philippot, and Robert Lensi. "Role of Respiratory Nitrate Reductase in Ability ofPseudomonas fluorescens YT101 To Colonize the Rhizosphere of Maize." Applied and Environmental Microbiology 66, no. 9 (2000): 4012–16. http://dx.doi.org/10.1128/aem.66.9.4012-4016.2000.

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ABSTRACT Selection of the denitrifying community by plant roots (i.e., increase in the denitrifier/total heterotroph ratio in the rhizosphere) has been reported by several authors. However, very few studies to evaluate the role of the denitrifying function itself in the selection of microorganisms in the rhizosphere have been performed. In the present study, we compared the rhizosphere survival of the denitrifyingPseudomonas fluorescens YT101 strain with that of its isogenic mutant deficient in the ability to synthesize the respiratory nitrate reductase, coinoculated in nonplanted or planted s
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26

TOYOTA, KOKI, CHIKAYO HIRAIWA (NOJIRI), and MAKOTO KIMURA. "Phenotypic Characterization of a Mutant of Burkholderia cepacia MRT11 Defective in Rhizosphere Competence." Microbes and environments 14, no. 4 (1999): 201–8. http://dx.doi.org/10.1264/jsme2.14.201.

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27

Barret, Matthieu, John P. Morrissey, and Fergal O’Gara. "Functional genomics analysis of plant growth-promoting rhizobacterial traits involved in rhizosphere competence." Biology and Fertility of Soils 47, no. 7 (2011): 729–43. http://dx.doi.org/10.1007/s00374-011-0605-x.

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28

Ben Saad, Marwa, Myriam Ben Said, Isabel Sanz-Sáez, et al. "Enhancement of rhizocompetence in pathogenic bacteria removal of a constructed wetland system." Water Science and Technology 79, no. 2 (2019): 251–59. http://dx.doi.org/10.2166/wst.2019.028.

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Abstract The main goal of the present study was to enhance the rhizobacterium potential in a horizontal subsurface flow constructed wetland system planted with Phragmites australis, through environmentally friendly biological approaches. The bioinoculation of antagonist bacteria has been used to promote higher rhizosphere competence and improve pathogenic bacteria removal from wastewater. The experiment was performed both with single and sequential bioinoculation. The results showed that strain PFH1 played an active role in pathogenic bacteria removal, remarkably improving inactivation kinetic
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29

Singh, Randeep, Aditi Sharma, and A. K. Gupta. "Rhizosphere competence of native Rhizobium rhizogenes strain and its use in management of crown gall." Journal of Applied and Natural Science 9, no. 3 (2017): 1772–81. http://dx.doi.org/10.31018/jans.v9i3.1437.

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Native Rhizobium rhizogenes strain UHFBA-212 [141/1A (NCBI: KC488174)]was isolated from rhizosphere soil of peach nursery plant of wild peach collected from Himachal Pradesh. In addition to this,159 isolates were also collected and were screened in vitro for their biocontrol potential against Agrobacterium tumefaciens. Out of these strain, UHFBA-212 showed maximum zone of inhibition i.e. 4.16 and 3.57cm without and after exposure to chloroform against C58.Sequence analysis (16SrDNA) of the strain showed nucleotide homology similar to Rhizobium sp. Amplification of total genomic DNA of the stra
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30

Landa, Blanca B., Olga V. Mavrodi, Jos M. Raaijmakers, Brian B. McSpadden Gardener, Linda S. Thomashow, and David M. Weller. "Differential Ability of Genotypes of 2,4-Diacetylphloroglucinol-Producing Pseudomonas fluorescens Strains To Colonize the Roots of Pea Plants." Applied and Environmental Microbiology 68, no. 7 (2002): 3226–37. http://dx.doi.org/10.1128/aem.68.7.3226-3237.2002.

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ABSTRACT Indigenous populations of 2,4-diacetylphloroglucinol (2,4-DAPG)-producing fluorescent Pseudomonas spp. that occur naturally in suppressive soils are an enormous resource for improving biological control of plant diseases. Over 300 isolates of 2,4-DAPG-producing fluorescent Pseudomonas spp. were isolated from the rhizosphere of pea plants grown in soils that had undergone pea or wheat monoculture and were suppressive to Fusarium wilt or take-all, respectively. Representatives of seven genotypes, A, D, E, L, O, P, and Q, were isolated from both soils and identified by whole-cell repetit
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31

Moënne-Loccoz, Yvan, Brendan McHugh, Peter M. Stephens, et al. "Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores." FEMS Microbiology Ecology 19, no. 4 (1996): 215–25. http://dx.doi.org/10.1111/j.1574-6941.1996.tb00214.x.

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32

McLean, K. L., J. Swaminathan, C. M. Frampton, J. S. Hunt, H. J. Ridgway, and A. Stewart. "Effect of formulation on the rhizosphere competence and biocontrol ability of Trichoderma atroviride C52." Plant Pathology 54, no. 2 (2005): 212–18. http://dx.doi.org/10.1111/j.1365-3059.2005.01158.x.

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33

Nian, Hong Juan, Jie Zhang, Shuo Liu, Fu Ping Song, and Da Fang Huang. "Effect of bacteriaphage and exopolysaccharide on root colonization and rhizosphere competence by Pseudomonas fluorescens." Annals of Microbiology 60, no. 2 (2010): 369–72. http://dx.doi.org/10.1007/s13213-010-0050-3.

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34

Moënne-Loccoz, Y. "Rhizosphere competence of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores." FEMS Microbiology Ecology 19, no. 4 (1996): 215–25. http://dx.doi.org/10.1016/0168-6496(96)00007-4.

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35

McLean, K. L., S. L. Dodd, B. E. Sleight, R. A. Hill, and A. Stewart. "Comparison of the behaviour of a transformed hygromycin resistant strain of Trichoderma atroviride (M1057hygR) with the wildtype strain (M1057)." New Zealand Plant Protection 57 (August 1, 2004): 72–76. http://dx.doi.org/10.30843/nzpp.2004.57.6892.

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The biocontrol isolate Trichoderma atroviride M1057 and a transformed hygromycin resistant biotype (M1057hygR) were compared using biological control rhizosphere competence and antibiosis studies to determine whether the transformed biotype performed in a similar manner to the wildtype strain In an onion growth chamber trial using soil naturally infested with the onion white rot pathogen Sclerotium cepivorum there was no significant difference (P>005) in the level of disease control given by the two T atroviride strains Similarly populations of T atroviride M1057 and M1057hygR were equivale
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36

Schreiter, Susanne, Martin Sandmann, Kornelia Smalla, and Rita Grosch. "Soil Type Dependent Rhizosphere Competence and Biocontrol of Two Bacterial Inoculant Strains and Their Effects on the Rhizosphere Microbial Community of Field-Grown Lettuce." PLoS ONE 9, no. 8 (2014): e103726. http://dx.doi.org/10.1371/journal.pone.0103726.

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37

Björkman, Thomas, Lisa Blanchard, and Gary E. Harman. "The Effect of Rhizosphere Competence on Colonization of Sweet Corn Roots by Biocontrol Fungi in Differing Soils." HortScience 33, no. 3 (1998): 526b—526. http://dx.doi.org/10.21273/hortsci.33.3.526b.

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To be effective, biocontrol agents, fungi need to colonize roots under a wide range of conditions. The ability do so is called rhizosphere competence. A common beneficial fungus, Trichoderma harzianum, has been bred to produce a new strain, T-22, that has exceptionally high rhizosphere competence. In field experiments, we have demonstrated that T-22 was resistant to edaphic conditions that reduce colonization by indigenous Trichoderma species, so that it can provide protection against root pathogens. Well-drained sand, stone or gravel soils supported lower populations of wild Trichoderma than
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38

Pappu, Lalitha. "Enhanced rhizosphere competence of Trichoderma viride grown in solid state fermentation on corn cob residue." Archives of Phytopathology and Plant Protection 51, no. 9-10 (2018): 505–29. http://dx.doi.org/10.1080/03235408.2018.1490236.

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39

Raaijmakers, Jos M., and David M. Weller. "Exploiting Genotypic Diversity of 2,4-Diacetylphloroglucinol-Producing Pseudomonas spp.: Characterization of Superior Root-Colonizing P. fluorescensStrain Q8r1-96." Applied and Environmental Microbiology 67, no. 6 (2001): 2545–54. http://dx.doi.org/10.1128/aem.67.6.2545-2554.2001.

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ABSTRACT The genotypic diversity that occurs in natural populations of antagonistic microorganisms provides an enormous resource for improving biological control of plant diseases. In this study, we determined the diversity of indigenous 2,4-diacetylphloroglucinol (DAPG)-producingPseudomonas spp. occurring on roots of wheat grown in a soil naturally suppressive to take-all disease of wheat. Among 101 isolates, 16 different groups were identified by random amplified polymorphic DNA (RAPD) analysis. One RAPD group made up 50% of the total population of DAPG-producing Pseudomonas spp. Both short-
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40

Khan, Sonam, Nikita Negi, Anshika Pal, et al. "Preliminary isolation and biochemical characterization of plant growth promoting rhizobacteria from Curcuma longa from the high-altitude region of Uttarakhand." Environment Conservation Journal 26, no. 1 (2025): 45–51. https://doi.org/10.36953/ecj.30193154.

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Curcuma longa L. (common name: turmeric) is a medicinal herb with a rhizome and belongs to the Zingiberaceae family. The Indian subcontinent widely cultivates it, making it a significant commercial crop. Plant growth-promoting rhizobacteria (PGPR), which are found in the rhizosphere of plants, significantly contribute to plant growth. They aid in the mobilization and absorption of crucial nutrients like nitrogen, phosphorus, potassium, zinc, and others. They also contribute to the production of phytohormones by enhancing the microbial load, regulating both primary and secondary metabolite path
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Mirleau, Pascal, Laurent Philippot, Thérèse Corberand, and Philippe Lemanceau. "Involvement of Nitrate Reductase and Pyoverdine in Competitiveness of Pseudomonas fluorescens Strain C7R12 in Soil." Applied and Environmental Microbiology 67, no. 6 (2001): 2627–35. http://dx.doi.org/10.1128/aem.67.6.2627-2635.2001.

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ABSTRACT Involvement of nitrate reductase and pyoverdine in the competitiveness of the biocontrol strain Pseudomonas fluorescens C7R12 was determined, under gnotobiotic conditions, in two soil compartments (bulk and rhizosphere soil), with the soil being kept at two different values of matric potential (−1 and −10 kPa). Three mutants affected in the synthesis of either the nitrate reductase (Nar−), the pyoverdine (Pvd−), or both (Nar− Pvd−) were used. The Nar− and Nar− Pvd− mutants were obtained by site-directed mutagenesis of the wild-type strain and of the Pvd− mutant, respectively. The sele
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Weller, David M. "Pseudomonas Biocontrol Agents of Soilborne Pathogens: Looking Back Over 30 Years." Phytopathology® 97, no. 2 (2007): 250–56. http://dx.doi.org/10.1094/phyto-97-2-0250.

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Pseudomonas spp. are ubiquitous bacteria in agricultural soils and have many traits that make them well suited as biocontrol agents of soilborne pathogens. Tremendous progress has been made in characterizing the process of root colonization by pseudomonads, the biotic and abiotic factors affecting colonization, bacterial traits and genes contributing to rhizosphere competence, and the mechanisms of pathogen suppression. This review looks back over the last 30 years of Pseudomonas biocontrol research and highlights key studies, strains, and findings that have had significant impact on shaping o
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T.G., Garagezov, Gasumov K.G., Sergerov S.V., Novruzov E.N., Muradov P.Z., and Shahmuradov I.A. "The Strategy Of Biology Study Of Absheron Population Of Saffron (Crocus sativus L.)." Journal of Life Sciences and Biomedicine 70, no. 2 (2015): 168–77. https://doi.org/10.5281/zenodo.7424183.

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The research plan on biology of Absheron population of Crocus sativus L., characterized by high pharmacological quality is proposed. The molecular-genetic, biochemical, microbiological and virological studies of this population for the purpose of standardization and quality certification of saffron as a ecoform, determination of the status of the ecoform as selenium-accumulator, elucidation of the role of rhizosphere bacteria in transformation and circulation of selenium, determination of the characteristics of the genetic control, setting of the period of ontogenetic development and determini
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Yan, Y., J. Yang, Y. Dou, et al. "Nitrogen fixation island and rhizosphere competence traits in the genome of root-associated Pseudomonas stutzeri A1501." Proceedings of the National Academy of Sciences 105, no. 21 (2008): 7564–69. http://dx.doi.org/10.1073/pnas.0801093105.

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Geetha, S. J., and Sanket J. Joshi. "Engineering Rhizobial Bioinoculants: A Strategy to Improve Iron Nutrition." Scientific World Journal 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/315890.

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Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive survival of the inoculated strain may be improved by employing strain selection and by genetic engineering of superior nitrogen fixing strains. Iron sufficiency is an important factor determining the survival and nodulation by rhizobia in soil. Siderophores, a class of ferric specific ligands that a
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López-Berges, Manuel S., Javier Capilla, David Turrà, et al. "HapX-Mediated Iron Homeostasis Is Essential for Rhizosphere Competence and Virulence of the Soilborne Pathogen Fusarium oxysporum." Plant Cell 24, no. 9 (2012): 3805–22. http://dx.doi.org/10.1105/tpc.112.098624.

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Shidore, Teja, Theresa Dinse, Johannes Öhrlein, Anke Becker, and Barbara Reinhold-Hurek. "Transcriptomic analysis of responses to exudates reveal genes required for rhizosphere competence of the endophyteAzoarcussp. strain BH72." Environmental Microbiology 14, no. 10 (2012): 2775–87. http://dx.doi.org/10.1111/j.1462-2920.2012.02777.x.

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Adu Oparah, Irene, Rosalind Deaker, Jade Christopher Hartley, et al. "Symbiotic Effectiveness, Rhizosphere Competence and Nodule Occupancy of Chickpea Root Nodule Bacteria from Soils in Kununurra Western Australia and Narrabri New South Wales Australia." Plants 14, no. 5 (2025): 809. https://doi.org/10.3390/plants14050809.

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Root nodule bacterial isolates from field-grown chickpea were evaluated in glasshouse and field experiments based on infectivity, relative symbiotic effectiveness, nodule occupancy, plant yield and survivability in the soil rhizosphere for their use as inoculants to enhance chickpea production in Western Australia. Compared to the Australian commercial chickpea inoculant strain Mesorhizobium ciceri sv. ciceri CC1192, 10 new strains were ‘fast’ growers, averaging 72 h to grow in culture at 28 °C. The relative symbiotic effectiveness (RSE%) of the new strains in field experiments determined by s
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Mavrodi, Olga V., Dmitri V. Mavrodi, Amanda A. Park, David M. Weller, and Linda S. Thomashow. "The role of dsbA in colonization of the wheat rhizosphere by Pseudomonas fluorescens Q8r1-96." Microbiology 152, no. 3 (2006): 863–72. http://dx.doi.org/10.1099/mic.0.28545-0.

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Certain well-conserved genes in fluorescent Pseudomonas spp. are involved in pathogenic interactions between the bacteria and evolutionarily diverse hosts including plants, insects and vertebrate animals. One such gene, dsbA, encodes a periplasmic disulfide-bond-forming enzyme implicated in the biogenesis of exported proteins and cell surface structures. This study focused on the role of dsbA in Pseudomonas fluorescens Q8r1-96, a biological control strain that produces the antibiotic 2,4-diacetylphloroglucinol (2,4-DAPG) and is known for its exceptional ability to colonize the roots of wheat a
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Nautiyal, C. Shekhar, J. K. Johri, and H. B. Singh. "Survival of the rhizosphere-competent biocontrol strainPseudomonas fluorescensNBRI2650 in the soil and phytosphere." Canadian Journal of Microbiology 48, no. 7 (2002): 588–601. http://dx.doi.org/10.1139/w02-054.

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Pseudomonas fluorescens NBRI2650 was isolated after screening 360 bacterial strains from the rhizosphere of chickpea (Cicer arietinum L.) grown in fungal-disease-suppressive field soil. The strain was selected because of its high rhizosphere competence and ability to inhibit the growth of Fusarium oxysporum f.sp. ciceri, Rhizoctonia bataticola, and Pythium sp. under in vitro conditions. Survival and colonization of NBRI2650 in the phytosphere of chickpea, cotton (Gossypium hirsutum L.), cucumber (Cucumis sativus L.), and tomato (Lycopersicon seculentum Mill.) were monitored using a chromosomal
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