Rhizosphere bacteria degrade auxin to promote root growth

Dynamic microbial communities exist both within and around plant tissues(Bulgarelli et al.,2012;Lundberg et al.,2012).Complex interactions among microorganisms,as well as between microorganisms and plants,are governed by a wide range of chemical signals and influence plant growth directly and indirectly(Lebeis et al.,2015;Durán et al.,2018;Finkel et al.,2019;Huang et al.,2019).Antagonistic interactions among microorganisms shape the plant microbiota and protect plants against pathogens.For example,Pseudomonas piscium isolated from the wheat Yannong 19 head microbiome inhibits the growth and virulence of the plant pathogenic fungus Fusarium graminearum by modulating the activity of its histone acetyltransferase(Chen et al.,2018).Moreover,a Flavobacterium cultivated from the root microbiota of wilt-resistant tomato can suppress Ralstonia solanacearum in susceptible tomato(Kwak et al.,2018).