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Dissertations / Theses on the topic 'Rhizosphere'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Burton, C. C. "Phosphomonoesterase and phosphodiesterase activities in rhizosphere and non-rhizosphere soil." Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378637.

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2

Dartnall, A. M. "Cyanogenesis and the rhizosphere." Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383179.

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3

Bergfield, William Alan. "Rhizosphere bacteria and benomyl interactions /." free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3036805.

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4

Levy, Avram. "Modelling rhizosphere interactions of Burkholderia species." University of Western Australia. School of Biomedical and Chemical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0123.

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[Truncated abstract] Genus Burkholderia encompasses a diverse collection of bacteria that inhabit rhizospheres throughout the world. Species can provide beneficial returns for eukaryotes, such as nitrogen fixation and nodule formation in plants and biocontrol of cropping systems. Burkholderia members can also cause disease in various animals, fungi and plants. These seemingly conflicting characteristics point to the capacity of Burkholderia spp. to interact with diverse eukaryotes. Within terrestrial ecosystems, Burkholderia spp. must negotiate favourable outcomes with both the primary produce
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5

Yeates, G. "Microbial population dynamics of the rhizosphere." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334939.

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6

Macey, Michael. "Characterisation of methylotrophs in the rhizosphere." Thesis, University of East Anglia, 2017. https://ueaeprints.uea.ac.uk/66855/.

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Methanol is the second most abundant volatile organic compound in the atmosphere, with the majority of this methanol being produced as a waste metabolic by-product of the growth and decay of plants. There is a large disparity between the amount of methanol estimated as being produced and that which enters the atmosphere. This disparity is believed to be due to the utilisation of methanol by plant associated methylotrophs. The diversity and activity of methylotrophs associated with the root and rhizosphere of pea and wheat plants was assessed through a range of cultivation independent and depen
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7

Deery, Sarah Jane. "Monitoring rhizosphere microbial communities of tomato." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12759/.

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Tomato is an economically important crop that can be devastated by many root infecting pathogens. The development of alternative and sustainable crop cultivation techniques and disease control methods is a must for the tomato industry, due to more strict government regulations and concerns over the sustainability of conventional chemical-intensive agriculture (Dixon and Margerison, 2009). In this thesis, the molecular fingerprinting method Terminal-Restriction Fragment Length Polymorphism (T-RFLP) and next generation sequencing method (pyrosequencing) were used, targeting ITS1, ITS2 and 23S ri
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8

Curnow, Philip Kenneth. "Influence of root exudates on rhizosphere pseudomonads." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286230.

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9

Sheta, Omar T. "Phytoremediation and rhizosphere manipulation using different amendments." Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/2147/.

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In two pot experiments using two different crop ryegrass (Lolium perenne) and two flax (Linum usitatissimum) varieties Viola and Elise, ryegrass decreased in the pool of heavy metals compared with bare soil using EDTA as extractant. NH4+ decreased the soil pH, increased EDTA-extractable Zn and increased the Zn uptake. Lime addition increased the pH and depressed Zn uptake. The pool of extractable EDTA was not changed by growing both of the flax varieties. Lime increased EDTA-extractable Cu and Pb significantly, but decreased the Zn, and pH increased in this order NH4+<NO3-<NH4++lime<NO3-+lime.
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10

Giles, Madeline E. "Where does denitrification occur in the rhizosphere?" Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=192249.

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Denitrification is the sequential reduction of NO3- to N2, through a number of intermediary steps, one of which is N2O, a potent green house gas. N2O has a global warming potential over 300 times greater than that of CO2 over a 100 a year period (IPCC, 2007). Soils are a significant source of N2O through the microbially mediated process of denitrification. The rhizosphere is a potentially important source of N2O as rhizodeposited carbon from plant roots can support a larger and more active microbial biomass. Despite this little is known about the effects of low molecular weight carbon (LMWC) o
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11

Pires, Ana Cecília da Cruz. "Mangrove rhizosphere effect on sediment Archael communities." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/3491.

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Mestrado em Microbiologia<br>Os mangais são económica e biologicamente importantes. Sendo, contudo, cada vez mais ameaçados. Com o intuito de recuperar estes ecossistemas, têm sido desenvolvidos programas de reabilitação. Todavia, geralmente, estes programas não consideram a importância e os possíveis efeitos das interacções entre microrganismos e plantas no ecossistema dos mangais, devido ao número limitado de estudos em ecologia microbiana neste ecossistema. Sabe-se que as raízes de espécies de plantas terrestres influenciam a composição das comunidades bacterianas do solo. Por sua vez, o
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12

Obeidy, Carole. "Effet de la végétation sur la mobilité de l’arsenic dans la rhizosphère." Thesis, Saint-Etienne, EMSE, 2011. http://www.theses.fr/2011EMSE0608/document.

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La pollution des sols par l’Arsenic (As) est une préoccupation environnementale grandissante dans plusieurs pays du monde : États-Unis, Canada, Mexique, Chine, Vietnam et France. L’émergence des techniques écologiques dites « phytoremédiation » constitue à l’heure actuelle une des solutions aux problématiques de décontamination des sols pollués par l’As. Aussi, elle permet de rallier le respect de l’état écologique des sites d’une part et le coût financier de traitement d’autre part. Pour cela, l’appréhension des interactions entre le végétal et l’As à l’interface racine-sol est nécessaire afi
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13

Lecomte, Solène. "Anaerobic respiration diversification in Agrobacterium fabrum C58." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1231.

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La respiration anaérobie peut être un trait essentiel dans le mode de vie, la colonisation de l'environnement et la survie. Jusqu'à présent, la seule respiration anaérobie confirmée chez Agrobacterium spp. est la dénitrification. De façon intéressante, cette voie est inégalement répandue chez les agrobactéries. Ces observations m'ont amené à mon hypothèse, à savoir la respiration anaérobie et notamment la dénitrification pourraient expliquer la coexistence d'agrobactéries et leur distribution dans des niches spécifiques de la rhizosphère. Ma thèse visait à explorer les stratégies de respiratio
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14

Goddard, Victoria Jane. "Population dynamics of fluorescent pseudomonads in the rhizosphere." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298609.

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15

Biran, Gemma Louisa. "Rhizosphere dynamics of Meloidogyne incognita and Verticillium chlamydosporium." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619510.

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16

Meharg, Andrew Alexander. "Factors affecting rhizosphere carbon-flow in Lolium perenne." Thesis, University of Aberdeen, 1989. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU031803.

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The dynamics of root carbon have been studied on a limited number of plants under a limited range of environmental conditions. This is particularly true of temperate pasture grasses. It was proposed to investigate rhizosphere carbon flow within Lolium perenne, to determine environmental factors affecting root exudation and root respiration. A number of microcosms were designed in which ryegrass could be pulse labelled with 14C-CO2, and the fate of the label determined within a plant-soil system. A wide range of factors were found to affect the distribution of carbon within the plant and soil u
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17

Rogers, Michael. "PCR-SSCP analysis of microbial communities in a model system." Thesis, University of Kent, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270818.

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18

George, Tim. "Enhanced phosphorus acquisition by Tithonia diversifolia and other potential agroforestry species." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326188.

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19

Naseby, David Craig. "Soil enzymes as indicators of perturbations in the rhizosphere." Thesis, University of Surrey, 1996. http://epubs.surrey.ac.uk/844143/.

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Most attempts to monitor the effects of introductions of Genetically Modified Micro-organisms (GMMs) have centred on the enumeration of specific populations. However for a significant perturbation to be measured, changes of between 100% and 300% (0.3 and 0.5 on a log scale) are necessary for the impact to be significant. Standard population measurements, assessing the survival, dissemination and effect on total indigenous populations do not give an indication of the functioning of the ecosystem. A range of soil enzyme assays have been developed as alternatives to population measurements. Assay
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20

Osborne, Meave Catherine. "The spatial ecology of phytopathogenic zoospores in the rhizosphere." Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369560.

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This thesis is concerned with an analysis of swimming of oomycete zoospores, particularly in relation to the hypothesis that electrotaxis mediated host root colonisation. A correlation was found between the electrotactic behaviour of zoospores of <I>Phytophthora palmivora </I>and <I>Pythium aphanidermatum</I> and their localisation relative to anodic or cathodic regions of the majority of non-host roots. Cathodotropic <I>P. aphanidermatum </I>zoospores were found to be attracted to the cathode generated at the wound site on monocotyledonous and dicotyledonous plant roots studied. Zoospores of
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21

Hale, Christopher Charles. "Characterisation of plant (Brassica spp.) and microbial rhizosphere functions." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/102344/.

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The rhizosphere is defined as the area of soil surrounding plant roots, which is influenced by plant exudates. The rhizosphere hosts a diverse and dynamic microbiome, which is shaped by both plant and environmental factors. The plant-microbe and microbe-microbe functional interactions which occur in the rhizosphere can have significant impacts on plant growth. Developing understanding of the composition, functions and interactions of the rhizosphere microbiome and the factors which shape it, may prove valuable to improve agricultural sustainability. The rhizosphere and bulk soil microbiomes of
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22

Pacheco, Adriana. "Contribution of methanotrophic groundwater and rhizosphere bacteria to phytoremediation." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013836.

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23

Randima, Livhuwani Priscilla. "Rhizosphere microbial diversity in PAH's contaminated and uncontaminated soil." Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-11302009-195201/.

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24

Zamberlin, Mary Frances. "Rhizosphere : Gilles Deleuze and minor American literature and thought /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6622.

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25

Maboreke, Hazel Ruvimbo. "Effect of plant-parasitic nematodes on rhizosphere interactions in oaks." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17783.

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Diese Arbeit untersucht die Reaktion der Stieleiche auf pflanzenparasitären Nematoden mittels RNA-Sequenzierung und Analyse von stabilen Isotopen und Fettsäuren. Einblicke in Rhizosphäreninteraktionen wurden über mutualistische Partner (Ektomykorrhizapilze, Rhizosphärenhelferbakterien), fungivore Collembolen und multitrophische Gemeinschaften gewonnen. Die Struktur und Biomasse der Mikroorganismen sowie die Fitness der Eichen wurden erfasst. Die Effekte wurzelfressender Nematoden auf die Eiche wurden durch das endogene rhythmische Wachstum des Baumes reguliert. Die Nematoden lösten eine stärk
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26

Münch, Christiane. "Die Bedeutung der wurzelassoziierten Mikroorganismen für die Stickstoffumsetzungen in Pflanzenkläranlagen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2003. http://nbn-resolving.de/urn:nbn:de:swb:14-1067340834875-91707.

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Plants in constructed wetlands serve as carriers for attached microbial growth. They mainly transfer oxygen and release exudates into the root zone. As a result, an area exists around the roots (rhizosphere) in which bacteria are stimulated by root growth. Our goals were to ascertain whether stimulating the microbial community only has a local effect on the rhizoplane, and to establish the importance of this stimulation for wastewater purification in the root zone. Observations were carried out in a planted and an unplanted laboratory batch reactor incubated with an artificial wastewater with
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27

Stevens, Daryl Philip. "Uptake of fluorides by the plant root." Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs8442.pdf.

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Copies of author's previously published articles in pocket. Bibliography: leaves 203-219. Main objectives of the thesis are: i. to verify a sealed chamber acid digestion technique for dissolution of plant material for total F analysis by a F ion selective electrode.--ii. to improve this technique for routine, rapid F analysis of plant material.--iii. to identify the inorganic ionic species of F which could be present in the soil solution.--iv. to determine which of these species are taken up by the plant root and those which are toxic to the plant.
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28

Zysko, Agnieszka. "Bacterial responses to changes in phosphorus supply in Ryegrass Rhizosphere." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518478.

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29

Keeble, Alison. "Interaction between mycorrhiza, rhizosphere bacteria and take-all on wheat." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342050.

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30

Avery, Lisa Marie. "The influence of UV-B radiation on rhizosphere microbial communities." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247141.

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31

Alegria, Terrazas Rodrigo. "Defining the host genetic control of the barley rhizosphere microbiota." Thesis, University of Dundee, 2019. https://discovery.dundee.ac.uk/en/studentTheses/4ca9658f-c69d-4c23-b1b2-46d0ef40339d.

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Limiting environmentally harmful consequences of crop production while increasing productivity amid climatic modifications is one of the major challenges facing agriculture in the XXIst century. Crucially, over the course of the next 30 years, innovative strategies are required to tackle this challenge and ensure a sustainable and safe access to food resources to a global population of over 9 billion people in 2050. One of these strategies proposes to exploit the microbial communities thriving in association with plant roots, collectively referred to as the rhizosphere microbiota, to uncouple
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32

Tkacz, Andrzej. "Plant genotype, immunity and soil composition control the rhizosphere microbiome." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/48113/.

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Three model plant and three crop plant species were grown for three generations in sand and compost. Pots were inoculated with 10 % soil initially, and with 10% of growth medium from the previous generation in generations 2 and 3, keeping replicates separate for all three generations. The microbiome community structure of the plant rhizosphere in each generation was characterised using ARISA DNA fingerprinting and 454 sequencing. Rhizosphere bacterial and fungal communities are different from those in bulk soil and there are also differences in the microbial community between different plant s
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33

Wakeford, Tom. "The molecular ecology of a legume rhizosphere : patterns and mechanisms." Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273883.

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34

Lee, Nathan Robert William. "Long Term Glyphosate Effects on Roundup Ready Soybean Rhizosphere Microorganisms." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525689141453883.

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35

Porteous, Fiona. "Use of lux-marked rhizobacteria to investigate rhizosphere C-flow." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU112116.

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The aim of this study was to develop a protocol for the use of a lux-marked pseudomonad for the investigation of rhizosphere C-fluxes, and then use this to examine a system experiencing change in C flow due to pollutant pressure. In this study a typical rhizobacterium, Pseudomonas fluorescens, was marked by the insertion of the lux gene cassette of Vibrio fischeri. Two constructs were produced, P. fluorescens pUCD607 (marked with the full lux gene cassette of CDABE) and P. fluorescens FAC510 (chromosomally marked with the lux AB genes), both with bioluminescence directly linked to metabolic ac
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36

Moritsuka, Naoki. "STUDIES ON THE DYNAMICS OF SOIL NUTRIENTS IN THE RHIZOSPHERE." Kyoto University, 2001. http://hdl.handle.net/2433/150333.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第9148号<br>農博第1209号<br>新制||農||831(附属図書館)<br>学位論文||H13||N3579(農学部図書室)<br>UT51-2001-K355<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授 小﨑 隆, 教授 櫻谷 哲夫, 教授 關谷 次郎<br>学位規則第4条第1項該当
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37

Devau, Nicolas. "Processus rhizosphériques déterminant la disponibilité en phosphore : apport de la modélisation mécaniste géochimique." Thesis, Montpellier, SupAgro, 2010. http://www.theses.fr/2010NSAM0019.

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Les processus rhizosphériques sont reconnus comme une des stratégies majeures élaborées par les plantes afin d'augmenter la disponibilité en phosphore (P) et ainsi améliorer leur nutrition phosphatée. Pourtant, l'effet exact de ces processus est encore mal caractérisé et quantifié. L'objectif de ces travaux a été d e déterminer le rôle exercé par les modifications chimiques induites par les racines, particulièrement la modification de pH, dans les changements de disponibilité en P dans la rhizosphère. Pour ce faire, nous avons utilisé des modèles mécanistes géochimiques (« triple plane », écha
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38

Ndanga, Mbakop Éliane. "Effet de la végétation dans le processus d'oxydation passive du méthane par les biosystèmes des sites d'enfouissement." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7547.

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Résumé : Les biosystèmes d’oxydation passive du CH[indice inférieur 4] constituent une alternative techniquement et économiquement viable pour la réduction des émissions fugitives de CH[indice inférieur 4] dans l’atmosphère par les sites d’enfouissement. Directement intégrés au recouvrement final, ils sont constitués d’une succession de couche de matériaux au sein desquelles se développent les bactéries méthanotrophes capable d’oxyder le CH[indice inférieur 4] en CO[indice inférieur 2] de façon passive, en présence de l’oxygène moléculaire. La capacité des BOPMs à réduire les émissions de CH[i
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39

Bressan, Mélanie. "Effets des exsudats racinaires d'une plante Brassicaceae sur les microorganismes rhizophériques : influence de la production d'un glucosinolate exogène chez Arabidopsis thaliana : utilisation d'une approche par traçafe de l'ADN (DAN-SIP)." Aix-Marseille 2, 2009. http://theses.univ-amu.fr.lama.univ-amu.fr/2009AIX22057.pdf.

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Une caractéristique des Brassicaceae est la production de métabolites secondaires soufrés appelés les glucosinolates, hydrolysés en divers dérivés bioactifs. Ces produits d’hydrolyse présentent des effets toxiques sur de nombreux microorganismes du sol. L’objectif de cette étude est d’examiner le rôle des glucosinolates et de leurs produits d’hydrolyse en tant que facteur de sélection et de structuration des communautés microbiennes de la rhizosphère des Brassicaceae. Pour cela, nous avons développé une approche de traçage isotopique de l’ADN (DNA-SIP) pour cibler les populations microbiennes
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40

Wouterlood, Madeleine. "Carboxylates in the rhizosphere of chickpea (Cicer arietinum) in relation to P acquisition." University of Western Australia. School of Plant Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0029.

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[Truncated abstract] The highly weathered, phosphorus-fixing soils of Western Australia require large amounts of P fertiliser to produce acceptable crop yields. Chickpea (Cicer arietinum L.) is an important leguminous crop that is increasingly used in rotations with wheat (Triticum aestivum L.), Western Australia’s major crop. Chickpea and a range of other species exude P-mobilising carboxylates into the rhizosphere. Plants that exude carboxylates may need less P fertiliser or may use P in the soil that is unavailable to other plants. There is a wealth of information about P mobilisation and c
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41

Delafuente, Leonardo. "Characterization of the ecological and physiological basis of superior rhizosphere colonization by 2,4-diacetylphloroglucinol-producing fluorescent Pseudomonas genotypes." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Fall2005/l%5Fdelafuente%5F1082405.pdf.

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42

Hart, Timothy David. "Diffusion of ions and water through microbial polysaccharides in the rhizosphere." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/842747/.

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It is proposed that microbial polysaccharides behave anion-exclusively, permitting the transport of cations, but excluding the diffusion of anions. This hypothesis has been investigated in the context of polysaccharides produced by microorganisms in the rhizosphere. The anion-exclusive behaviour of exopolysaccharides, extracted from broth cultures of a range of rhizosphere microorganisms together with several commercial polysaccharides (i.e., xanthan, scleroglucan, dextran, guar gum) was investigated by measuring the electrochemical potential which developed as a result of the diffusion of KC1
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43

Devine, Gary J. "Detecting pathogens and beneficial microorganisms in the tomato rhizosphere using microarrays." Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665477.

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The cultivation of tomato (Solanum lycopersicum) plants for their edible fruits is a worldwide industry that was valued at over $58.7B in 2011. Traditional breeding has predominantly focused on increasing fruit yield or the accumulated concentrations of health-promoting phytochemicals, such as the antioxidant Iycopene. As a result, tomato crops remain susceptible to a large number of potentially devastating diseases which cause significant economic losses to commercial producers. These diseases are incited by a diverse group of microorganisms including bacteria, fungi, nematodes and oomycetes.
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44

Turner, Thomas. "Metatranscriptomic analysis of community structure and metabolism of the rhizosphere microbiome." Thesis, University of East Anglia, 2013. https://ueaeprints.uea.ac.uk/49600/.

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Plant-microbe interactions in the rhizosphere, the region of soil influenced by plant roots, are integral to biogeochemical cycling, and maintenance of plant health and productivity. Interactions between model plants and microbes are well understood, but relatively little is about the plant microbiome. Here, comparative metatranscriptomics was used to determine taxonomic compositions and metabolic responses of microbes in soil and the rhizospheres of wheat, oat and pea. Additionally a wild-type oat was compared to a mutant (sad1) deficient in production of antifungal avenacins. Analyses of tax
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45

Braga, Lucas Palma Perez. "Disentangling the influence of earthworms on microbial communities in sugarcane rhizosphere." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/64/64133/tde-26052017-100757/.

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For the last 150 years many studies have shown the importance of earthworms for plant growth, but the exact mechanisms involved in the process are still poorly understood. Many important functions required for plant growth can be performed by soil microbes in the rhizosphere. To investigate earthworm influence on the rhizosphere microbial community, it was performed a macrocosm experiment with and without Pontoscolex corethrurus (EW+ and EW-, respectively) and followed various soil and rhizosphere processes for 217 days with sugarcane. In the second chapter of this thesis it was demonstrate th
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46

Murphy, Conor. "Investigation of rhizosphere priming effects for N mineralisation in contrasting soils." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=228575.

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In the context of nutrient cycling in soil, plant-mediated mineralisation of carbon (C) and nitrogen (N) is poorly understood. The broad focus of this thesis was to investigate the potential importance of plant-mediated mineralisation (i.e.priming) on C and N mineralisation in soils with contrasting crop productivities. The studies focus on two soils, which had similar chemical and physical properties but contrasting plant productivities relating to their N supply capacity. These soils were used to investigate the potential importance of priming processes in contributing to the contrasting cap
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47

Lloyd, Davidson A. "Effects of rhizosphere priming and microbial functions on soil carbon turnover." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/9278.

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A major uncertainty in soil carbon studies is how inputs of fresh plant-derived carbon affect the turnover of existing soil organic matter (SOM) by so-called priming effects. Priming may occur directly as a result of nutrient mining by existing microbial communities, or indirectly via microbial population adjustments. Soil type and conditions may also influence the intensity and direction of priming effects. However the mechanisms are poorly understood. The objectives of this study were (1) to investigate how additions of labile C4 substrate affected SOM turnover in two contrasting unplanted C
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48

Colocho, Hurtarte Luis Carlos. "Plant Nitrogen status driving soil organic matter mineralization in the rhizosphere." Universidade Federal de Viçosa, 2016. http://www.locus.ufv.br/handle/123456789/10440.

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Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2017-05-30T14:01:02Z No. of bitstreams: 1 texto completo.pdf: 1950608 bytes, checksum: 86ce9edf2ae6c14704b23eea6f458809 (MD5)<br>Made available in DSpace on 2017-05-30T14:01:02Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1950608 bytes, checksum: 86ce9edf2ae6c14704b23eea6f458809 (MD5) Previous issue date: 2016-01-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Os fatores que regulam a dinâmica do Carbono (C) e Nitrogênio (N) do solo na rizosfera são ainda pouco compreendidos. A mineralização d
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49

Betencourt, Elodie. "Interactions entre céréale et légumineuse en association et acquisition de phosphore du sol : processus rhizosphériques sous-jacents." Thesis, Montpellier, SupAgro, 2012. http://www.theses.fr/2012NSAM0018/document.

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L'objectif de cette étude a été de préciser l'implication des processus rhizosphériques dans lesinteractions pour l'acquisition de phosphore (P) entre une céréale et une légumineuse enassociation. Nous avons proposé comme mécanisme de facilitation l'acidification de la rhizosphèredes espèces en association induite par la fixation de N2 de la légumineuse dans le cas de sol neutres àalcalins. Ainsi, l'étude s'est focalisée sur l'influence des changements de pH induits par les racines.Les effets de la disponibilité initiale en P du sol ainsi que de la distance entre les racines des espècesassocié
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50

Gautier, Antoine. "Rôles du porte-greffe et du greffon dans la réponse à la disponibilité en phosphore chez la Vigne." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0257/document.

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La Vigne est cultivée en système greffé, combinant les qualités de production fruitière des Vignes Européennes (Vitis vinifera) et la tolérance phylloxérique des Vignes Américaines (Vitis spp.). Cependant l’utilisation de porte-greffes américains modifie le développement, la physiologie, et l’alimentation hydrique et minérale du greffon. Plus particulièrement, le fond génétique des porte-greffes de la Vigne semble impliqué dans la régulation de la nutrition en phosphore (P) du greffon. Le phosphore est un élément nutritif essentiel pour la croissance des plantes, impliqué dans la composition d
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