Symbiont abundance is more important than pre-infection partner choice in a Rhizobium - legume mutualism

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• 作者：Jannick Van Cauwenberghe^a ; ^b ; ^{jannick.vancauwenberghe@bio.kuleuven.be" class="auth_mail" title="E-mail the corresponding author} ; Benny Lemaire^a ; Andrei Stefan^c ; Rodica Efrose^d ; Jan Michiels^b ; Olivier Honnay^a
• 关键词：Rhizobium leguminosarum biovar viciae ; Vicia cracca ; Rhizobia ; Pre-infection partner choice ; Symbiont preference
• 刊名：Systematic and Applied Microbiology
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：39
• 期：5
• 页码：345-349
• 全文大小：853 K

文摘

It is known that the genetic diversity of conspecific rhizobia present in root nodules differs greatly among populations of a legume species, which has led to the suggestion that both dispersal limitation and the local environment affect rhizobial genotypic composition. However, it remains unclear whether rhizobial genotypes residing in root nodules are representative of the entire population of compatible symbiotic rhizobia. Since symbiotic preferences differ among legume populations, the genetic composition of rhizobia found within nodules may reflect the preferences of the local hosts, rather than the full diversity of potential nodulating rhizobia present in the soil. Here, we assessed whether Vicia cracca legume hosts of different provenances select different Rhizobium leguminosarum genotypes than sympatric V. cracca hosts, when presented a natural soil rhizobial population. Through combining V. cracca plants and rhizobia from adjacent and more distant populations, we found that V. cracca hosts are relatively randomly associated with rhizobial genotypes. This indicates that pre-infection partner choice is relatively weak in certain legume hosts when faced with a natural population of rhizobia.