Among this group of microorganisms are some rootassociated bacteria, termed plant growth-promoting rhizobacteria (PGPR), which is a class of non-pathogenic soil microorganisms that have a beneficial effect on plant growth (Kloepper et al., 1980).
Among this group of microorganisms are some rootassociatedbacteria, termed plant growth-promoting rhizobacteria(PGPR), which is a class of non-pathogenic soil microorganisms thathave a beneficial effect on plant growth (Kloepper et al., 1980).