A biocontrol Streptomyces isolate (C) was
tested for its plant growth promoting qualities under saline
conditions. Exposure to elevated osmotic strengths up to
300 mM NaCl increased dry weight and cfu/ml signifi-
cantly. The isolate C produced indolyl-3-acetic acid (IAA)
into the medium in the amount of 2.4 lg/ml. The amount
of auxin increased after adding salt and reached to 4.7
lg/ml in 300 mM NaCl. Biosynthesis of siderophore was
detectable and increased in presence of NaCl. Streptomyces
isolate C showed good solubilization of tricalcium phosphate
in culture medium with 92 mg/l. Solubilization
decreased in presence of NaCl. Soil treatment with isolate
C increased the growth and development of wheat plant in
normal and saline conditions. In this treatment there were
significant increases in germination rate, percentage and
uniformity, shoot length and dry weight compared to the
control. Applying the bacterial inocula increased the concentration
of N, P, Fe and Mn in wheat shoots grown in
normal and saline soil, but had non-significant effect on
other micro and macronutrients concentrations. Results of
this study show that Streptomyces isolate C has potential to
be utilized as biofertilizer in saline soils.