For example, Zehnder et al. (1997) determined that applying plantgrowth-promoting
rhizobacteria (PGPR) can induce resistance against
cucumber beetle feeding in cucumbers. The cotton inoculated with
Pseudomonas gladioli can also reduce the relative growth rate and
digestibility of Helicoverpa armigera because of the induced increase in
foliar polyphenol and terpenoid content (Qingwen et al., 1998). In
addition, one study indicated that, when rice (Oryza sativa)was
inoculated with various PGPR strains, the incidence of rice leaf folder
(Cnaphalocrocis medinalis) was reduced (Loganathan et al., 2010)
because of a greater accumulation of enzyme lipoxygenase and
chitinase activity against leaf folder insects. Therefore, numerous
beneficial soil-borne microbes are suggested to cooperate with plants
to combat insect herbivores by promoting plant growth and inducing
resistance (Pineda et al., 2010).