Light availability and rhizobium variation interactively mediate the outcomes of legume–rhizobium symbiosis
Autor: | Christie R. Klinger, Stephanie Heniff, Jennifer A. Lau, Justin C. Podowski, Katy D. Heath, Wendy H. Yang, Dylan J. Weese, Patricia V. Burke |
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Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
Genotype Plant Science Biology medicine.disease_cause 010603 evolutionary biology 01 natural sciences Rhizobium leguminosarum Intraspecific competition Rhizobia Symbiosis Nitrogen Fixation Genetics medicine Ecology Evolution Behavior and Systematics Mutualism (biology) Ecology fungi food and beverages Fabaceae Interspecific competition biochemical phenomena metabolism and nutrition biology.organism_classification bacteria Rhizobium 010606 plant biology & botany |
Zdroj: | American Journal of Botany. 107:229-238 |
ISSN: | 1537-2197 0002-9122 |
Popis: | Premise Nutrients, light, water, and temperature are key factors limiting the growth of individual plants in nature. Mutualistic interactions between plants and microbes often mediate resource limitation for both partners. In the mutualism between legumes and rhizobia, plants provide rhizobia with carbon in exchange for fixed nitrogen. Because partner quality in mutualisms is genotype-dependent, within-species genetic variation is expected to alter the responses of mutualists to changes in the resource environment. Here we ask whether partner quality variation in rhizobia mediates the response of host plants to changing light availability, and conversely, whether light alters the expression of partner quality variation. Methods We inoculated clover hosts with 11 strains of Rhizobium leguminosarum that differed in partner quality, grew plants under either ambient or low light conditions in the greenhouse, and measured plant growth, nodule traits, and foliar nutrient composition. Results Light availability and rhizobium inoculum interactively determined plant growth, and variation in rhizobium partner quality was more apparent in ambient light. Conclusions Our results suggest that variation in the costs and benefits of rhizobium symbionts mediate host responses to light availability and that rhizobium strain variation might more important in higher-light environments. Our work adds to a growing appreciation for the role of microbial intraspecific and interspecific diversity in mediating extended phenotypes in their hosts and suggests an important role for light availability in the ecology and evolution of legume-rhizobium symbiosis. |
Databáze: | OpenAIRE |
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