IAA producing microorganisms are known
to promote root elongation and plant growth
(Patten and Glick 2002). IAA-production by
root associated bacteria is a major
mechanism of plant growth promotion this
has important implication for the
development of the root system under the
influence of rhizosphere microbes (Anton
Hartmann et al., 2009). IAA-biosynthesis of
the plant growth promoting Rhizobacterium,
Azospirillum brasilense was shown to be
induced in rhizoplane colonizing bacteria
(Rothballer et al., 2005).