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Plos One : Applying Reversible Mutations of Nodulation and Nitrogen-fixation Genes to Study Social Cheating in Rhizobium Etli-legume Interaction, Volume 8

By Ballhorn, Daniel

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Book Id: WPLBN0003944043
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Reproduction Date: 2015

Title: Plos One : Applying Reversible Mutations of Nodulation and Nitrogen-fixation Genes to Study Social Cheating in Rhizobium Etli-legume Interaction, Volume 8  
Author: Ballhorn, Daniel
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
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Publisher: Plos

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Ballhorn, D. (n.d.). Plos One : Applying Reversible Mutations of Nodulation and Nitrogen-fixation Genes to Study Social Cheating in Rhizobium Etli-legume Interaction, Volume 8. Retrieved from http://netlibrary.net/


Description
Description : Mutualisms are common in nature, though these symbioses can be quite permeable to cheaters in situations where one individual parasitizes the other by discontinuing cooperation yet still exploits the benefits of the partnership. In the Rhizobium-legume system, there are two separate contexts, namely nodulation and nitrogen fixation processes, by which resident Rhizobium individuals can benefit by cheating. Here, we constructed reversible and irreversible mutations in key nodulation and nitrogen-fixation pathways of Rhizobium etli and compared their interaction with plant hosts Phaseolus vulgaris to that of wild type. We show that R. etli reversible mutants deficient in nodulation factor production are capable of intra-specific cheating, wherein mutants exploit other Rhizobium individuals capable of producing these factors. Similarly, we show that R. etli mutants are also capable of cheating inter-specifically, colonizing the host legume yet contributing nothing to the partnership in terms of nitrogen fixation. Our findings indicate that cheating is possible in both of these frameworks, seemingly without damaging the stability of the mutualism itself. These results may potentially help explain observations suggesting that legume plants are commonly infected by multiple bacterial lineages during the nodulation process.

 

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