Host control over infection and proliferation of a cheater symbiont

Journal of Evolutionary Biology
J L SachsA S Patil

Abstract

Host control mechanisms are thought to be critical for selecting against cheater mutants in symbiont populations. Here, we provide the first experimental test of a legume host's ability to constrain the infection and proliferation of a native-occurring rhizobial cheater. Lotus strigosus hosts were experimentally inoculated with pairs of Bradyrhizobium strains that naturally vary in symbiotic benefit, including a cheater strain that proliferates in the roots of singly infected hosts, yet provides zero growth benefits. Within co-infected hosts, the cheater exhibited lower infection rates than competing beneficial strains and grew to smaller population sizes within those nodules. In vitro assays revealed that infection-rate differences among competing strains were not caused by variation in rhizobial growth rate or interstrain toxicity. These results can explain how a rapidly growing cheater symbiont--that exhibits a massive fitness advantage in single infections--can be prevented from sweeping through a beneficial population of symbionts.

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Citations

Nov 11, 2011·PloS One·Joel L SachsAmanda C Hollowell
Apr 3, 2014·PloS One·Hironori FujitaMasayoshi Kawaguchi
Feb 28, 2014·Proceedings. Biological Sciences·John U RegusJoel L Sachs
Jun 22, 2011·Proceedings of the National Academy of Sciences of the United States of America·Joel L SachsJohn U Regus
Oct 31, 2014·Proceedings. Biological Sciences·Anna K Simonsen, John R Stinchcombe
Sep 23, 2014·Trends in Plant Science·Jocelyn E BehmE Toby Kiers
Feb 21, 2014·The Quarterly Review of Biology·Megan E Frederickson
Mar 5, 2011·Trends in Ecology & Evolution·Joel L SachsMartin M Turcotte
Apr 14, 2015·Annals of the New York Academy of Sciences·Jennifer J Wernegreen
Oct 1, 2015·Trends in Microbiology·U G Mueller, J L Sachs
May 16, 2012·Annals of the New York Academy of Sciences·Emily I JonesRégis Ferrière
Jan 17, 2014·The New Phytologist·Anna K Simonsen, John R Stinchcombe
Apr 29, 2016·Proceedings. Biological Sciences·Amanda C HollowellJoel L Sachs
May 1, 2016·Current Opinion in Microbiology·Sylvie EstrelaJ Jeffrey Morris
Jun 9, 2016·Systematic and Applied Microbiology·Jannick Van CauwenbergheOlivier Honnay
Feb 9, 2018·Journal of Evolutionary Biology·V J PahuaJ L Sachs
May 31, 2018·The New Phytologist·Joel L SachsCamille E Wendlandt
Oct 30, 2016·American Journal of Botany·K Charlotte Jandér, Edward Allen Herre
Oct 30, 2016·American Journal of Botany·Michael A GrilloKaty D Heath
Jun 19, 2016·Applied and Environmental Microbiology·Kelsey A Gano-CohenJoel L Sachs
Mar 13, 2012·The New Phytologist·Maren L Friesen
Oct 16, 2019·Nature Microbiology·Rebecca AnsorgeJillian Petersen
Jan 30, 2020·Proceedings. Biological Sciences·Kelsey A Gano-CohenJoel L Sachs
Feb 6, 2020·The New Phytologist·Benoît Perez-LamarqueFlorent Martos
Jan 6, 2015·Journal of Evolutionary Biology·J U RegusJ L Sachs
Nov 29, 2017·Annals of Botany·Nicole J Forrester, Tia-Lynn Ashman
Nov 20, 2016·The New Phytologist·Rebecca T BatstoneMegan E Frederickson

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