Advanced Molecular Tools for Analysis of Bacterial Communities and Their Interactions in the Rhizosphere

Elsas, Jan Dirk van; Mandić-Mulec, Ines

doi:10.1002/9781118297674.ch10

Cited by 1 publication

(1 citation statement)

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“…In addition, surfactin by inducing a potassium leakage in the cells (Lopez et al ., ) indirectly serves as a signal that triggers biofilm formation, which is essential for colonization of roots (Beauregard et al ., ; Zeriouh et al ., ) and protection of plants against pathogens (Bais et al ., ; Chen et al ., ; Zeriouh et al ., ). In fact, B. subtilis is regarded to be a PGPR (plant growth‐promoting rhizobacterium) and has been well known for its biocontrol potential (Barea et al ., ; Berg, ; van Elsas and Mandic‐Mulec, ). It was even proposed that the vegetative form of this species is normally associated with plant roots and that soil is predominantly inhabited by its dormant spores (Norris and Wolf, ).…”

Section: Introductionmentioning

confidence: 99%

ExploringComQXPAquorum‐sensing diversity and biocontrol potential ofBacillusspp. isolates from tomato rhizoplane

Oslizlo

Štefanič

Vatovec

et al. 2015

Microbial Biotechnology

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Bacillus subtilis is a widespread and diverse bacterium t exhibits a remarkable intraspecific diversity of the ComQXPA quorum-sensing (QS) system. This manifests in the existence of distinct communication groups (pherotypes) that can efficiently communicate within a group, but not between groups. Similar QS diversity was also found in other bacterial species, and its ecological and evolutionary meaning is still being explored. Here we further address the ComQXPA QS diversity among isolates from the tomato rhizoplane, a natural habitat of B. subtilis, where these bacteria likely exist in their vegetative form. Because this QS system regulates production of anti-pathogenic and biofilm-inducing substances such as surfactins, knowledge on cell–cell communication of this bacterium within rhizoplane is also important from the biocontrol perspective. We confirm the presence of pherotype diversity within B. subtilis strains isolated from a rhizoplane of a single plant. We also show that B. subtilis rhizoplane isolates show a remarkable diversity of surfactin production and potential plant growth promoting traits. Finally, we discover that effects of surfactin deletion on biofilm formation can be strain specific and unexpected in the light of current knowledge on its role it this process.

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