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Bacillus velezensis is a Gram-positive plant-beneficial bacterium which is widely used in agriculture. Additionally,Bacillus spp. are some of the model organisms used in the study of biofilms, and as such, the molecular networks and regulation systems of biofilm formation are well characterized. However, the molecular processes involved in root colonization by plant-beneficialBacillus strains remain largely unknown. Here, we showed that WTAs play important roles in the plant root colonization process. The loss of thegtaB gene affects the ability ofB. velezensis SQR9 to sense plant polysaccharides, which are important environmental cues that trigger biofilm formation and colonization in the rhizosphere. This knowledge provides new insights into theBacillus root colonization process and can help improve our understanding of plant-rhizobacterium interactions.

Bacillus velezensis Wall Teichoic Acids Are Required for Biofilm Formation and Root Colonization