Screening of Endophytic Bacteria for
Producing IAA
IAA is the main auxin in controlling
many important physiological processes
such as cell enlargement, division and tissue
differentiation (Tsavkelova et al., 2007,
Samavat et al., 2011). Sarwar et al. (1995)
stated that some bacteria with the ability to
produce IAA may be useful in increasing the
growth of crops. Previous studies had clearly
shown that the bacterial IAA yield varied
with bacterial strains, culture conditions,
amount of tryptophan supplemented and
method of analysis (Tambalo et al., 2006).
In this study, 119 bacterial strains from
soybean roots and 277 strains from corn
roots were randomly selected for screening
their abilities of producing IAA. Among the
396 isolates selected, we found 157 isolates
(54 from soybean and 103 from corn), i.e.