Buddhi Charana Walpola1* and K.K.I.U.Arunakumara2
1Department of Soil Science, Faculty of Agriculture, University of Ruhuna, Sri Lanka
2Department of Crop Science, Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka
Abstrsact
Phosphate solubilizing and indole acetic acid (IAA) producing bacteria are considered to be
beneficial microorganisms as they have a profound effect on plant growth. A total of 35 phosphate
solubilizing
bacterial
strains
were
isolated
and
screened
for
the
production
of
IAA.
Two
best
performing Enterobacter species were selected and employed in elucidating their phosphate
solubilizing
potential
and
IAA
production
under
different
conditions.
Both
strains
were
found
to increase available phosphorus content in the medium profusely (640 µg/ml in E.
ludwigii and 621 µg/ml in E. hormaechei). They recorded the maximum IAA production (240
and 332 µg/ml respectively in E. ludwigii and
E. hormaechei), in NB medium supplemented
with tryptophan (0.8% and 0.6% respectively in E. ludwigii and E. hormaechei) at 30 0C. It is
evident from results that both strains possess great potential to be developed as bio-fertilizers
which could enhance soil fertility and plant growth through phosphate solubilization and IAA
production.
Key words: Enterobacter hormaechei, Enterobacter ludwigii, IAA production, phosphate solubilization
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* - Corresponding Author
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