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39 results for “Plant symbiosis”
Evolutionary dynamics of mycorrhizal symbiosis in land plant diversification - phylogenetic data
<p>This submission supplements the manuscript entitled <em>Evolutionary dynamics of mycorrhizal symbiosis in land plant diversification</em> by <strong>Frida A.A. Feijen, Rutger A. Vos, Jorinde Nuytinck & Vincent S.F.T. Merckx.</strong></p> <p>The contents of this submission are dating analysis results for rootings of the land plant topology. Contains the following files:</p> <ul> <li>*.log.gz BEAST logs</li> <li>*.trees.gz BEAST trees</li> <li>*.tiff screen dumps of tracer, showing the burn-in</li> <li>*.consensus.trees produced with treeannotator</li> </ul> <p><strong>For more information</strong>: https://github.com/naturalis/mycorrhiza/tree/v1.0.0</p>
Shifts in evolutionary lability underlie independent gains and losses of root-nodule symbiosis in a single clade of plants
<p><span>Supplementary Data 4 from the manuscript "Shifts in evolutionary lability underlie independent gains and losses of root-nodule symbiosis in a single clade of plants". </span></p> <p><span>A concatenated alignment of all samples and all loci. This file was used for branch length estimation and not directly for phylogeny reconstruction (though an extraction of each subtree taxonomic samples subset from this alignment would be the alignment used to produce the scaffolded subtrees that were described in the paper). Sequences are labeled by well and can be mapped back to taxon for sub-setting and further use using Supplementary Data 1. </span></p>
Data from: Mycorrhizal symbiosis increases plant phylogenetic diversity and regulate community assembly
<p>The intricate mechanisms shaping plant diversity and community composition are the cornerstone of ecological understanding. Yet, the role of mycorrhizal symbiosis, the fundamental partnership between fungi and plant roots, in influencing community composition has often been underestimated. Here, we use extensive species survey data from 1,315 terrestrial ecosystem sites to elucidate the influence of mycorrhizal symbiosis on plant phylogenetic diversity and its implications for community assembly processes. Our findings demonstrate that increasing mycorrhizal symbiotic potential leads to greater phylogenetic dispersion within plant communities. Furthermore, we unveil a distinct dichotomy in the assembly processes governed by mycorrhizal status. Mycorrhizal species predominantly influence deterministic processes, suggesting a role in niche-based community assembly. Conversely, non-mycorrhizal species exert a stronger influence on stochastic processes, highlighting the importance of random events in shaping community structure. These results underscore the crucial but often hidden role of mycorrhizal symbiosis in driving plant community diversity and assembly. This study provides valuable insights into the complex mechanisms shaping ecological communities and the way for more informed conservation and management practices that acknowledge the complex interplay between symbiosis and ecological community dynamics.</p>
Rhizobia-legume symbiosis mediates direct and indirect interactions between plants, herbivores and their parasitoids
<p>Data and R scripts for statistical analyses for the article:</p> <p><strong>Rhizobia-legume symbiosis mediates direct and indirect interactions between plants, herbivores and their parasitoids</strong></p> <p>By: <strong>Carlos Bustos-Segura, Adrienne L. Godschalx, Lucas Malacari, Fanny Deiss, Sergio Rasmann, Daniel J. Ballhorn, Betty Benrey</strong> </p> <p> </p> <p><strong>Abstract</strong></p> <p>Microorganisms associated with plant roots significantly impact the quality and quantity of plant defences. However, the bottom-up effects of soil microbes on the aboveground multitrophic interactions remain largely under studied. To address this gap, we investigated the chemically-mediated effects of nitrogen-fixing rhizobia on legume-herbivore-parasitoid multitrophic interactions. To address this, we initially examined the cascading effects of the rhizobia bean association on herbivore caterpillars, their parasitoids, and subsequently investigated how rhizobia influence on plant volatiles and extrafloral nectar. Our goal was to understand how these plant-mediated effects can affect parasitoids. Lima bean plants (<em>Phaseoulus lunatus</em>) inoculated with rhizobia exhibited better growth, and the number of root nodules positively correlated with defensive cyanogenic compounds. Despite increase of these chemical defences, <em>Spodoptera</em> latifascia caterpillars preferred to feed and grew faster on rhizobia-inoculated plants. Moreover, the emission of plant volatiles after leaf damage showed distinct patterns between inoculation treatments, with inoculated plants producing more sesquiterpenes and benzyl nitrile than non-inoculated plants. Despite these differences, <em>Euplectrus platyhypenae</em> parasitoid wasps were similarly attracted to rhizobia- or no rhizobia-treated plants. Yet, the oviposition and offspring development of <em>E. platyhypenae </em>was better on caterpillars fed with rhizobia-inoculated plants. We additionally show that rhizobia-inoculated common bean plants (<em>Phaseolus vulgaris</em>) produced more extrafloral nectar, with higher hydrocarbon concentration, than non-inoculated plants. Consequently, parasitoids performed better when fed with extrafloral nectar from rhizobia-inoculated plants. While the overall effects of bean-rhizobia symbiosis on caterpillars were positive, rhizobia also indirectly benefited parasitoids through the caterpillar host, and directly through the improved production of high quality extrafloral nectar. This study underscores the importance of exploring diverse facets and chemical mechanisms that influence the dynamics between herbivores and predators. This knowledge is crucial for gaining a comprehensive understanding of the ecological implications of rhizobia symbiosis on these interactions.</p>
Data from: Mycorrhizal symbiosis increases plant phylogenetic diversity and regulate community assembly
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Data for mycorrhizal C/N ratio determines plant-derived carbon and nitrogen allocation to symbiosis
<p><span><span>Nutrient cycling in temperate forests is driven by carbon allocation of trees to soil via ectomycorrhizas (EM). The sink activities of different fungal taxa for host resources are unknown. Aboveground dual </span><span>labeling of young beech<span> with <sup>15</sup>N and <sup>13</sup>C was used to trace resource transport to ectomycorrhizal root tips. Isotope enrichment in EM correlated with that in the corresponding EM-attached lateral root, supporting that EM drive taxon-specific N- and C-fluxes. The enrichments with <sup>13</sup>C and <sup>15</sup>N in EM increased with decreasing C/N ratio of the symbiotic association. Abundances of EM species were positively correlated with <sup>13</sup>C enrichment, demonstrating higher fitness of stronger than of less C-demanding symbioses. Overall, our results imply that differences among the resource traits of EM species regulate the supply of the symbioses with host-derived C and N.</span></span></span></p> <p><span><span><span>Here we provide the data sets containing information on the identities of fungal species colonizing roots tips of European beech and for N, C, 15N and 13C contents in bark, coarse roots, fine roots, very fine lateral roots, ectomycorrhizal species and rhizosphere soil and for biomass of the different compartments. The data were collected 5 and 20 days after labelling.</span></span></span></p>
Data for Torppa et al. 2023 'Soil compaction effects on arbuscular mycorrhizal symbiosis in wheat depend on host plant variety'
<p>The dataset consists of the data that supports the findings of the article 'Soil compaction effects on arbuscular mycorrhizal symbiosis in wheat depend on host plant variety’ written by Torppa et al. and published in Plant and Soil in 2023. The data consists of arbuscular mycorrhizal colonization, fatty acid and community data, as well as soil and crop nutrient and yield data.</p>
Unveiling an asymmetric plant–fungal symbiosis: morphological, cytogenetic, and molecular characterization of a haploid <em>Epichloë festucae</em> strain associated with three polyploid cytotypes of the Iberian endemic grass <em>Festuca rothmaleri</em>
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Data for mycorrhizal C/N ratio determines plant-derived carbon and nitrogen allocation to symbiosis
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Even obligate symbioses show signs of ecological contingency: impacts of symbiosis for an invasive stinkbug are mediated by host plant context
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Urbanization drives partner switching and loss of mutualism in an ant-plant symbiosis
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Data from: Increasing prevalence of plant-fungal symbiosis across two centuries of environmental change
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Context-dependent variability in the population prevalence and individual fitness effects of plant-fungal symbiosis
<p>1. Heritable symbionts, found within a diverse array of flora and fauna, are often observed at intermediate prevalence within host populations, despite expectations that positive fitness feedbacks should drive beneficial symbionts to fixation. Intermediate prevalence may reflect neutral dynamics of symbionts with weak fitness effects, transient dynamics of symbionts trending toward fixation (or elimination), or a stable intermediate outcome determined by the balance of fitness effects and failed symbiont transmission. Theory suggests these outcomes should depend on symbiont-conferred effects and vertical transmission efficiency, which may both depend on environmental context.</p> <p>2. We tested these alternatives by tracking temporal change in population-level symbiont prevalence in a three-year field experiment with grasses and vertically transmitted fungal endophytes under the context of manipulated precipitation. Precipitation can mediate endophyte effects on host grasses, and is a relevant context, as global climate models predict changes in precipitation amount and seasonal distribution.</p> <p>3. We found evidence for each of the three proposed mechanisms for intermediate symbiont prevalence, but the outcome differed qualitatively across years and precipitation treatments. Specifically, within the first study year, all populations under ambient precipitation trended toward symbiont fixation, whereas elevated precipitation literally neutralized the interaction resulting in no long-run equilibrium. The second study year yielded a different result with long-run equilibria at an intermediate prevalence for both ambient and elevated precipitation treatments. We linked these population-level outcomes with individual-level symbiont effects on grasses and showed that the benefits of symbiosis were concentrated at the seedling stage, especially under drought stress during the time period coinciding with recruitment. The drought stress evident during the first year of the study was not present in the second year due to greater ambient precipitation during this time period. Together, these findings provide the first experimental evidence that population-level outcomes of host-symbiont interactions, which arise from the composite outcome of demographic vital rates and transmission, can be dynamically stable and can fluctuate in response to shifts in spatio-temporal context.</p> <p>4. Synthesis: Overall, these results indicate that intermediate prevalence of heritable microbial symbionts likely reflects a combination of neutral, transient, and stable mechanisms, and context-dependent fluctuations among them.</p>
Data from: Community analysis of microbial sharing and specialization in a Costa Rican ant–plant–hemipteran symbiosis
Ants have long been renowned for their intimate mutualisms with trophobionts and plants and more recently appreciated for their widespread and diverse interactions with microbes. An open question in symbiosis research is the extent to which environmental influence, including the exchange of microbes between interacting macroorganisms, affects the composition and function of symbiotic microbial communities. Here we approached this question by investigating symbiosis within symbiosis. Ant–plant–hemipteran symbioses are hallmarks of tropical ecosystems that produce persistent close contact among the macroorganism partners, which then have substantial opportunity to exchange symbiotic microbes. We used metabarcoding and quantitative PCR to examine community structure of both bacteria and fungi in a Neotropical ant–plant–scale-insect symbiosis. Both phloem-feeding scale insects and honeydew-feeding ants make use of microbial symbionts to subsist on phloem-derived diets of suboptimal nutritional quality. Among the insects examined here, Cephalotes ants and pseudococcid scale insects had the most specialized bacterial symbionts, whereas Azteca ants appeared to consume or associate with more fungi than bacteria, and coccid scale insects were associated with unusually diverse bacterial communities. Despite these differences, we also identified apparent sharing of microbes among the macro-partners. How microbial exchanges affect the consumer-resource interactions that shape the evolution of ant–plant–hemipteran symbioses is an exciting question that awaits further research.
Data from: Plant-fungal symbiosis affects litter decomposition during primary succession
Microbial symbionts of plants can affect decomposition by altering the quality or quantity of host plant tissue (substrate) or the micro-environment where decomposition occurs (conditioning). In C3 grasses, foliar fungal endophytes (Clavicipitaceae) can increase plant resistance to drought and/or produce alkaloids that reduce herbivory – effects that may also influence host litter composition and subsequent litter decomposition. We studied the effect of the endophyte Epichloë sp. on litter decomposition in the Great Lakes dunes (USA) using a reciprocal design altering endophyte presence/absence in both American beachgrass Ammophila breviligulata substrate (litter bags) and its conditioning of the decomposition microenvironment. Symbiont treatments were crossed with rain-out shelters that altered growing season precipitation. The first year of decomposition, senesced leaf substrate from A. breviligulata with Epichloë decomposed 21% faster than endophyte-free substrate. By the third year, conditioning by live symbiotic plants reduced cumulative decomposition by 33% compared to plots planted with endophyte-free plants. Of the traits we examined – litter quantity, C:N ratio, mineral composition, fungal colonization, and carbon chemistry – increased litter quantity via greater tiller production was the primary trait shift associated with endophyte symbiosis. Epichloë in A. breviligulata litter also altered litter nitrogen decomposition dynamics, as evidenced by lower nitrogen and protein content in decomposed tissue from plants that hosted the endophyte. Differences in initial litter quality and subsequent colonization by saprotrophic fungi were ruled out as key drivers. Altered precipitation had negligible effects on decomposing processes in the dunes. Grass–Epichloë symbiosis altered nutrient cycling through increasing the rate of litter decomposition when present in the litter and through reducing litter decomposition by conditioning the decomposition microenvironment. Epichloë are widespread symbionts of grasses. Thus, their effects on decomposition could be an important, but often overlooked, driver of nutrient cycling in grass-dominated ecosystems.
Data from: Nuclear DNA based species delineations of Coccus scale insects in symbiosis with plants and ants, and the role of plant epicuticular wax in structuring associations
We undertook phylogenetic analysis of nuclear DNA to elucidate species boundaries in the symbiotic Coccus scale insects associated with mutualistic Crematogaster ants and Macaranga plants occurring in the ever-wet forests of Southeast Asia. The coccid specimens clustered into ten lineages, each corresponding to a morphospecies assignment. The lineage identified as C. secretus was separated from the Main Clade by an outgroup. We also examined all pairwise associations among the three symbiont guilds to understand how patterns of association were structured. The analyses revealed that each ant, plant or coccid operational (taxonomic) unit often associated with multiple O(T)Us of each of the other two guilds. However, where testing was feasible, a 'preference' for one or sometimes two partner O(T)Us of each guild was often detected. Mutual 'preferences' or 'avoidances' were relatively common among the symbionts, and no conflicts of interest were apparent. The network of preferred partners among all three guilds showed compartmentalization structured by the presence/absence of plant epicuticular wax, suggesting that this feature plays a fundamental role in how the symbionts select partners that best serve their needs. To a lesser degree, the network was also structured by whether the host plant stems were ant-excavated or hollowed naturally.
Mycorrhizal symbiosis and phosphorus supply determine interactions among plants with contrasting nutrient-acquisition strategies
<p>Highly diverse plant communities growing on nutrient-impoverished soils are test beds for theories on species coexistence. Here, neighbouring mycorrhizal and non-mycorrhizal plants compete for limited phosphorus. The impact of belowground interactions on community dynamics is underexplored.</p> <p>We used an experimental approach to investigate effects of inoculation with arbuscular mycorrhizal (AM) fungi and a phosphorus supply gradient on competitive and facilitative interactions among mixed assemblages of woody plants in microcosms. The plant species, one cluster-root forming (CR) species and four AM species, are native to jarrah forest that grows on nutrient-impoverished soils in south-western Australia. We measured plant growth in microcosms, with and without inoculation with the AM fungus <i>Rhizophagus irregularis</i>,<i> </i>and across a gradient of P supply: 0, 9, 27, and 243 mg P per kg of soil.</p> <p>Our data show evidence of plant-plant facilitation at low P supply and competition at high P supply. Growth of the CR species, <i>Hakea undulata</i>, was highest in microcosms with 0P and without AM inoculation. One AM species, <i>Bossiaea aquifolium</i>, also performed better at lower P levels, possibly benefitting from P mobilised by <i>H. undulata</i>. The other three AM species, one strongly obligate, performed better at higher P levels. Data for <i>Acacia celastrifolia</i> suggested it was facultatively mycotropic, and because there was no correlation between AM colonisation and the relative inoculum effect, we suggest positive effects of AM inoculation at 9P might be due to benefits other than P-acquisition, such as pathogen defence. Benefit of AM inoculation diminished for three of four mycorrhizal species at the highest P-level as we had predicted. The fourth species, <i>Eucalyptus marginata</i> (jarrah), had higher growth in microcosms that were not inoculated with AM, perhaps because the species benefits more from ectomycorrhizas.</p> <p><i>Synthesis. </i>Our experimental data suggests spatial heterogeneity of soil P, coupled with a diversity of nutrient acquisition strategies, and plasticity among plant-plant and plant-AM fungi interactions, contributes to plant species coexistence in the nutrient-impoverished jarrah forest. Our research highlights the importance of belowground mechanisms for understanding factors determining community structure including a potential role of AM fungi in plant pathogen defence.</p>
Data from: Plant-fungal symbiosis affects litter decomposition during primary succession
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Data from: The direct and ecological costs of an ant-plant symbiosis
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Data from: Community analysis of microbial sharing and specialization in a Costa Rican ant–plant–hemipteran symbiosis
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