An Experimental Test of the Rhizopine Concept in Rhizobium meliloti.

Applied and Environmental Microbiology
D M GordonP J Murphy

Abstract

In some Rhizobium-legume symbioses, compounds known as rhizopines are synthesized by bacteroids and subsequently catabolized by free-living cells of the producing strain. It has been suggested than rhizopines act as proprietary growth substrates and enhance the competitive ability of the producing strain in its interactions with the diverse microbial community found within the rhizosphere. Wild-type, rhizopine-producing Rhizobium meliloti L5-30 and mutant L5-30 strains deficient for either rhizopine synthesis or catabolism were inoculated onto lucerne host plants in competition experiments. These experiments demonstrated that no apparent advantage resulted from the ability to synthesize a rhizopine, whereas the ability to catabolize rhizopine provided a clear advantage when an organism was in competition with a strain without this ability. The results suggest that when an organism is in competition with a catabolism-deficient mutant, the ability to catabolize rhizopine results in enhanced rates of nodulation. The results of the experiments were not consistent with the hypothesis that the sole role of rhizopines is to act as proprietary growth substrates for the free-living population of the producing strain.

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Citations

Sep 28, 2007·Canadian Journal of Microbiology·Jerzy WielboAnna Skorupska
Aug 6, 2014·Canadian Journal of Microbiology·Barney A Geddes, Ivan J Oresnik
Aug 2, 2019·Nature Communications·Barney A GeddesPhilip S Poole
Sep 19, 2002·Molecular Plant-microbe Interactions : MPMI·Michael A SavkaSilvia Rossbach
Jan 14, 2005·Critical Reviews in Microbiology·E SomersM Srinivasan
Mar 10, 2005·Microbiology and Molecular Biology Reviews : MMBR·Anja Brencic, Stephen C Winans
Nov 29, 2013·Molecular Plant-microbe Interactions : MPMI·Masayuki Sugawara, Michael J Sadowsky
Dec 3, 1998·Applied and Environmental Microbiology·B B M Gardener, de Bruijn FJ
Apr 17, 2016·Applied and Environmental Microbiology·Florence MusJohn W Peters
Jan 17, 2020·Plants·Kishan MahmudAli Missaoui
Mar 29, 2001·Proceedings of the National Academy of Sciences of the United States of America·R M BringhurstD J Gage
Mar 23, 2001·Canadian Journal of Microbiology·K HeinrichP J Murphy
Nov 25, 2020·The ISME Journal·Timothy L HaskettPhilip S Poole
Mar 8, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Seema SheoranSujay Rakshit
Aug 6, 2008·Bioorganic & Medicinal Chemistry·Elke SchoffersSilvia Rossbach

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