chapter  2
Roles and Mechanisms of Rhizobacteria in Regulating Plant Tolerance to Abiotic Stress
WithWilliam Errickson, Bingru Huang
Pages 15

Plants growing in natural environments or cultivated agricultural systems form interactions with microorganisms. The rhizosphere contains a high percentage of microbial diversity and abundance, with plants secreting root exudates that serve as substrates and attractants for bacterial and fungal organisms (Dakora and Phillips, 2002; Chaparro et al., 2014). Some bacteria develop symbiotic relationships with plants, which promote plant performance and survival in a wide range of environmental conditions, including root-colonizing plant growth-promoting rhizobacteria (PGPR) (Lugtenberg and Kamilova, 2009; Yang et al., 2009; Berg et al., 2014; Liu and Zhang, 2015; Poupin et al., 2016). Endophytic PGPR in the microbial communities form closer associations with the plant host than free-living bacteria in the rhizosphere, as they colonize the internal tissues and can directly regulate cellular processes of their host plant (Conn et al., 1997; Chanway et al., 2000).