1887

Abstract

Rhizosphere colonization by bacteria involves molecular and cellular mechanisms, such as motility and chemotaxis, biofilm formation, metabolic versatility, or biosynthesis of secondary metabolites, among others. Nonetheless, there is limited knowledge concerning the main regulatory factors that drive the rhizosphere colonization process. Here we show the importance of the AmrZ and FleQ transcription factors for adaption in the plant growth-promoting rhizobacterium (PGPR) and rhizosphere colonization model F113. RNA-Seq analyses of F113 grown in liquid cultures either in exponential and stationary growth phase, and rhizosphere conditions, revealed that rhizosphere is a key driver of global changes in gene expression in this bacterium. Regarding the genetic background, this work has revealed that a mutation in causes considerably more alterations in the gene expression profile of this bacterium than a mutation in under rhizosphere conditions. The functional analysis has revealed that in F113, the transcription factors AmrZ and FleQ regulate genes involved in diverse bacterial functions. Notably, in the rhizosphere, these transcription factors antagonistically regulate genes related to motility, biofilm formation, nitrogen, sulfur, and amino acid metabolism, transport, signalling, and secretion, especially the type VI secretion systems. These results define the regulon of two important bifunctional transcriptional regulators in pseudomonads during the process of rhizosphere colonization.

Funding
This study was supported by the:
  • Ministerio de Educación, Cultura y Deporte (Award FPU16/05513)
    • Principle Award Recipient: EstherBlanco-Romero
  • Ministerio de Ciencia, Innovación y Universidades (Award RTI2018-093991-B-I00)
    • Principle Award Recipient: MartaMartín
  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2022-01-11
2022-01-28
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