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Selection mosaics differentiate Rhizobium–host plant interactions across different nitrogen environments


Van Cauwenberghe, J and Visch, W and Michiels, J and Honnay, O, Selection mosaics differentiate Rhizobium-host plant interactions across different nitrogen environments, Oikos, 125, (12) pp. 1755-1761. ISSN 0030-1299 (2016) [Refereed Article]

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© 2016 The Authors. Oikos © 2016 Nordic Society Oikos

DOI: doi:10.1111/oik.02952


The nature and direction of coevolutionary interactions between species is expected to differentiate among distinct environments. Consequently, locally coevolved symbiotic traits would be well matched in similar environments, but mismatched elsewhere. In a classic mutualistic tradeoff, rhizobia provide nitrogen (N) to legume host plants in return for photosynthates. Despite earlier predictions, there is little evidence so far that spatial differences in soil N content mediate the coevolutionary outcome of the legume–Rhizobium mutualism. To test the existence of such selection mosaics, different genotypes of Vicia cracca and Rhizobium leguminosarum originating from spatially and environmentally highly differentiated sites were cross inoculated across different soil N regimes. In accordance with theoretical predictions, we found highly significant effects of genotype by genotype by environment (G× G × E) interactions, on both nodulation and plant growth, even when R. leguminosarum genotypes showed high genetic similarity. Our results show that the trajectory of the coevolutionary interactions between rhizobia and legumes is differentiated across different environments, and that selection mosaics may play an important role in shaping differences in the genetic composition of rhizobial populations.

Item Details

Item Type:Refereed Article
Keywords:co-evolution, ecology, microbiology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial ecology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Visch, W (Dr Wouter Visch)
ID Code:151868
Year Published:2016
Web of Science® Times Cited:9
Deposited By:Ecology and Biodiversity
Deposited On:2022-08-05
Last Modified:2022-10-03

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