The Sinorhizobium (Ensifer) fredii HH103 Type 3 Secretion System Suppresses Early Defense Responses to Effectively Nodulate Soybean

Molecular Plant-microbe Interactions : MPMI
Irene Jiménez-GuerreroFrancisco Javier López-Baena

Abstract

Plants that interact with pathogenic bacteria in their natural environments have developed barriers to block or contain the infection. Phytopathogenic bacteria have evolved mechanisms to subvert these defenses and promote infection. Thus, the type 3 secretion system (T3SS) delivers bacterial effectors directly into the plant cells to alter host signaling and suppress defenses, providing an appropriate environment for bacterial multiplication. Some rhizobial strains possess a symbiotic T3SS that seems to be involved in the suppression of host defenses to promote nodulation and determine the host range. In this work, we show that the inactivation of the Sinorhizobium (Ensifer) fredii HH103 T3SS negatively affects soybean nodulation in the early stages of the symbiotic process, which is associated with a reduction of the expression of early nodulation genes. This symbiotic phenotype could be the consequence of the bacterial triggering of soybean defense responses associated with the production of salicylic acid (SA) and the impairment of the T3SS mutant to suppress these responses. Interestingly, the early induction of the transcription of GmMPK4, which negatively regulates SA accumulation and defense responses in soybean via WRKY...Continue Reading

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Citations

Mar 5, 2016·Journal of Experimental Botany·Ying-Ying GeChristian Staehelin
May 24, 2016·International Journal of Molecular Sciences·Francisco J López-BaenaJosé M Vinardell
Nov 17, 2015·PloS One·Irene Jiménez-GuerreroFrancisco Javier López-Baena
Dec 6, 2016·Molecular Plant-microbe Interactions : MPMI·Matthew S NelsonMichael J Sadowsky
Dec 28, 2017·FEMS Microbiology Letters·David DuránLuis Rey
Dec 18, 2016·Applied and Environmental Microbiology·Irene Jiménez-GuerreroFrancisco Javier López-Baena
Sep 27, 2018·Molecular Plant-microbe Interactions : MPMI·Fathi BerrabahBenjamin Gourion
Jul 30, 2019·Plant, Cell & Environment·Ke YuRoeland L Berendsen
Oct 15, 2019·Cellular Microbiology·Claire BenezechBenjamin Gourion
Jun 27, 2020·Journal of Experimental Botany·Irene Jiménez-GuerreroFrancisco Javier López-Baena
Jan 12, 2019·Frontiers in Plant Science·Jianping WangPascal Ratet
Dec 12, 2020·Environmental Microbiology·Irene Jiménez-GuerreroFrancisco Pérez-Montaño

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