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GROWTH PROMOTING ACTIVITIES OF DIFFERENT
RHIZOBIUM SPP., IN WHEAT
IJAZ MEHBOOB1, ZAHIR AHMAD
ZAHIR1*, MUHAMMAD ARSHAD1, ASIF TANVEER2 AND
FAROOQ-E-AZAM3
Abstract:
In the present study, large number of
rhizobial strains were isolated from chickpea, lentil and mung been
nodules and twenty fast growing colonies of each host legume, were
selected. A series of jar experiments were executed and three most
efficient isolates of each rhizobium species were screened on the
basis of their growth promoting activities under axenic conditions.
Results revealed that, in general, most of the isolates showed growth
promoting effect but deleterious effect by some of the isolates was also
observed on different parameters. The nine screened isolates were
further evaluated for their growth promoting behavior in pots. The
results indicated positive and increasing impact on growth and yield
attributes by all the inoculants. However, in some parameters the
increases were statistically same as with un-inoculated control. The
isolates improved plant height (up to 18.66%), tillers per plant (up to
68.76%), straw yield (up to 35.14%), grain yield (up to 30.29%),
1000-grain weight (up to 28.40%), root length (up to 51.72%), % N in
grains and straw (up to 15.07 and 33.16%), % P in grains and straw (up
to 23.39 and 66.66%) and % K in grains and straw (up to 51.72 and
21.80%) compared with un-inoculated control. Finally, it is suggested
that the procedure adopted for the selection of fast growing isolates
and test of their growth promoting potential with wheat seedlings under
axenic conditions could be an effective approach for screening the
efficient and effective isolates. Also, the selected rhizobial strains
could be used as PGPR for non-legumes.
1Institute
of Soil & Environmental Sciences, University of Agriculture,
Faisalabad-38040, Pakistan
2Department
of Agronomy, University of Agriculture, Faisalabad-38040, Pakistan
3Nuclear
Institute for Food and Agriculture, Peshawar, Pakistan
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