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39 results for “Rhizobia”
Data from: A generalist nematode destabilizes plant competition: no evidence for direct effects, but strong evidence for indirect effects on rhizobia abundance
<p><span>1. Difficulties quantifying pathogen load and mutualist abundance limit our ability to connect disease dynamics to host community ecology. For example, specific predictions about how differential pathogen load is hypothesized to drive host competitive outcomes are rarely tested. Additionally, although infection is known to affect mutualists, we rarely measure the magnitude of pathogen effects on mutualist abundance across host competitive contexts. <span>We </span>tested for both mechanisms <span>in </span>a plant-rhizobia-nematode system.</span></p> <p><span><span>2. We </span>paired the legume <i>Medicago lupulina </i>with intra- and interspecific plant <span>com</span>petitors, with and without a generalist nematode parasite <i>Meloidogyne </i>sp. <span>Relative </span>change in plant biomass was used to determine how nematode inoculation <span>affected </span>plant competitive outcomes. <span>We</span> counted nematode galls to test for direct effects of parasitism on plant competition, and rhizobia nodules to test for indirect effects <span>of </span>nematode presence on rhizobia abundance.</span></p> <p>3. Parasites were destabilizing despite similar nematode load across competition treatments. During inter- compared to intraspecific competition, nematode <span>inoculation </span>decreased nodulation on <i>M. lupulina</i>, increased nodulation on <i>Trifolium repens</i>, and had no effect on nodulation on <i>Chamaecrista fasciculata.</i></p> <p><span><span>4. We </span>found no support for hypothesized direct effects of nematode load on competitive outcomes, and strong but idiosyncratic indirect effects of nematode <span>inoculation </span>on rhizobia abundance.</span></p>
Data from: Transcriptomic basis of genome by genome variation in a legume-rhizobia mutualism
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Data from: Recurrent mutualism breakdown events in a legume rhizobia metapopulation
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Data from: A generalist nematode destabilizes plant competition: no evidence for direct effects, but strong evidence for indirect effects on rhizobia abundance
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Data from: When mutualisms matter: Rhizobia effects on plant communities depend on host plant population and soil nitrogen availability
1.Mutualistic interactions, such as the relationship between legumes and rhizobia, can affect community properties, yet there needs to be greater understanding of when these interactions may be most important to communities. Resource mutualism theory provides predictions based on variation in abiotic and biotic factors. First, there is substantial intraspecific genetic variation in how legumes interact with rhizobia, including variation in legume growth response to rhizobia, number of rhizobia-housing nodules, and nitrogen fixation. Rhizobia likely have greater community impacts when associating with hosts that benefit greatly from rhizobia, produce many nodules, and fix a lot of nitrogen. Second, increased soil nutrient availability typically reduces the partner benefits of legume-rhizobium interactions. As a result, the legume-rhizobium resource mutualism may have greater effects on communities in low nitrogen environments. 2.We first conducted a common garden study of the annual legume Chamaecrista fasciculata to explore intraspecific variation in focal traits related to competition and mutualistic interactions with rhizobia. Then, we manipulated the presence of rhizobia, nitrogen fertilization, and population identity of C. fasciculata in mesocosms simulating native plant communities. We measured plant diversity, assessed changes in community composition, and measured soil nutrient availability. 3.We detected significant genetically-based intraspecific variation in growth and mutualism related traits across C. fasciculata populations. From the experimental mesocosms, we found that although rhizobia consistently reduced diversity, rhizobia most strongly reduced diversity when associating with C. fasciculata populations that were highly dependent on rhizobia and when nitrogen was most limiting. We also detected greater variation among populations in their effects on communities in the absence of rhizobia; the presence of rhizobia dramatically minimized effects of population identity on the surrounding community. 4.Synthesis. These findings show that abiotic environmental factors and intraspecific variation in a dominant host plant can influence the magnitude of mutualism effects on communities and, reciprocally, how the presence of key mutualists can influence the importance of genetically-based variation among populations to community outcomes. While prior studies have detected both strong and weak effects of mutualism on plant communities, our study illustrates that mutualism theory may predict when strong mutualism effects are most likely to occur and also shows how theories developed for particular species interactions may make studies investigating the ecological impacts of genetic variation a more predictive science.
Data from: Genetic conflict with a parasitic nematode disrupts the legume-rhizobia mutualism
Genetic variation for partner quality in mutualisms is an evolutionary paradox. One possible resolution to this puzzle is that there is a tradeoff between partner quality and other fitness-related traits. Here, we tested whether a susceptibility to parasitism is one such tradeoff in the mutualism between legumes and nitrogen-fixing bacteria (rhizobia). We performed two greenhouse experiments with the legume Medicago truncatula. In the first, we inoculated each plant with the rhizobia Ensifer meliloti and with one of 40 genotypes of the parasitic root-knot nematode Meloidogyne hapla. In the second experiment, we inoculated all plants with rhizobia and half of the plants with a genetically variable population of nematodes. Using the number of nematode galls as a proxy for infection severity, we found that plant genotypes differed in susceptibility to nematode infection, and nematode genotypes differed in infectivity. Second, we showed that there was a genetic correlation between the number of mutualistic structures formed by rhizobia (nodules) and the number of parasitic structures formed by nematodes (galls). Finally, we found that nematodes disrupt the rhizobia mutualism: nematode-infected plants formed fewer nodules and had less nodule biomass than uninfected plants. Our results demonstrate that there is genetic conflict between attracting rhizobia and repelling nematodes in Medicago. If genetic conflict with parasitism is a general feature of mutualism, it could account for the maintenance of genetic variation in partner quality and influence the evolutionary dynamics of positive species interactions.
Data from: When mutualisms matter: Rhizobia effects on plant communities depend on host plant population and soil nitrogen availability
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Data from: Genetic conflict with a parasitic nematode disrupts the legume-rhizobia mutualism
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Mesquite Nodulating Rhizobia - 1988 and 1989
Soil samples were collected from mesquite dune site, and analyzed for the number of rhizobia nodules.
Overproduction of indole-3-acetic acid in free-living rhizobia mimics physiological conditions required for nitrogen fixation inside root nodules
GEO Series GSE69880. Sinorhizobium meliloti. 6 samples. Type: Expression profiling by high throughput sequencing.
Rhizobia Contribute to Salinity Tolerance in Common Beans ( Phaseolus vulgaris L.)
GEO Series GSE216374. Rhizobium phaseoli. 6 samples. Type: Expression profiling by high throughput sequencing.
Analysis of transcriptome response of rhizobia to aluminium toxicity
GEO Series GSE193556. Rhizobium phaseoli. 6 samples. Type: Expression profiling by high throughput sequencing.
The absence of quorum sensing signals triggers the expression of the symbiotic genes in broad host range rhizobia
GEO Series GSE78039. Sinorhizobium fredii NGR234. 12 samples. Type: Expression profiling by high throughput sequencing.
Gene expression profile at single cell level of Medicago truncatula roots in response to rhizobia infection
GEO Series GSE210881. Medicago truncatula. 6 samples. Type: Expression profiling by high throughput sequencing.
Phosphate deficiency negatively affects early steps of the symbiosis between common bean and rhizobia
GEO Series GSE118968. Phaseolus vulgaris. 12 samples. Type: Expression profiling by high throughput sequencing.
DNF7 is required for the persistence of rhizobia in the nitrogen fixation zone
GEO Series GSE65328. Medicago truncatula. 2 samples. Type: Expression profiling by high throughput sequencing.
MACE-seq transcriptomic analysis of MtCLE35 overexpressing roots of M. truncatula without rhizobia inoculation and at 11 dpi after inoculation with S. meliloti.
GEO Series GSE261468. Medicago truncatula. 12 samples. Type: Expression profiling by high throughput sequencing.
Medicago truncatula R108 in symbiosis with rhizobia wt or rhizobia mutant for BacA. Comparison of the transcriptomic response of Medicago truncatula plants.
GEO Series GSE121775. Medicago truncatula. 6 samples. Type: Expression profiling by array.
The rhizobia strain collection of Latvia University of Life Sciences and Technologies, containing strains from the historical rhizobia collection of Latvia University of Life Sciences and Technologies and newly isolated strains
<p>List of rhizobia and non-rhizobial endophyte bacterial strains, isolated from various legumes in Latvia. These strains are a part of the Rhizobia collection, Insitute of Soil and Plant Sciences, Latvia University of Life Sciences and Technologies. List include rhizobia strain identification, isolation year and host plant.</p>
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