abstract
The aims of our study were to enhance growth, yield and micronutrient status of wheat crop by various
combinations of microbial strains (Bacillus megaterium, Arthrobacter chlorophenolicusandEnterobacter
sp.) under pot andfield experiments. Microbial strains were isolated from soils of different cropping
systems and characterized by biochemical and molecular methods. Microbial strains (B. megaterium
BHU1 and A. chlorophenolicusBHU3) showed positive result for nitrogenfixation and phosphate
solubilization, while Enterobactersp. BHU5 gave positive result in nitrogen fixation only. However,
A. chlorophenolicusandEnterobactersp. showed HCN production whileB. megateriumandEnterobacter
sp. gave siderophore. Maximum N2-fixation and IAA production were observed with 15.0 mg N g
1
carbon by A. chlorophenolicus and 26.4mgml
1
at tryptophan 100mgml
1
by Enterobacter sp,
respectively. Triple combination of strains B. megaterium, A. chlorophenolicusandEnterobactersignificantly increased 17.5%, 79.8%, 78.6% and 26.7% plant height, grain yield, straw yield and test weight
under pot condition and also 29.4%, 27.5%, 29.5% and 17.6% underfield condition, respectively. Similarly
these treatment combinations showed maximum nutrient acquisition and content of micronutrient viz.
Fe, Cu, Mn and Zn in grain of wheat under both conditions. The results showed that the combined
application of indigenous PGPR,B. megaterium, A. chlorophenolicusandEnterobactercan be used as
efficient microbial consortium for wheat production.
&2014 Elsevier Ltd. All rights reserved
abstractThe aims of our study were to enhance growth, yield and micronutrient status of wheat crop by variouscombinations of microbial strains (Bacillus megaterium, Arthrobacter chlorophenolicusandEnterobactersp.) under pot andfield experiments. Microbial strains were isolated from soils of different croppingsystems and characterized by biochemical and molecular methods. Microbial strains (B. megateriumBHU1 and A. chlorophenolicusBHU3) showed positive result for nitrogenfixation and phosphatesolubilization, while Enterobactersp. BHU5 gave positive result in nitrogen fixation only. However,A. chlorophenolicusandEnterobactersp. showed HCN production whileB. megateriumandEnterobactersp. gave siderophore. Maximum N2-fixation and IAA production were observed with 15.0 mg N g1carbon by A. chlorophenolicus and 26.4mgml1at tryptophan 100mgml1by Enterobacter sp,respectively. Triple combination of strains B. megaterium, A. chlorophenolicusandEnterobactersignificantly increased 17.5%, 79.8%, 78.6% and 26.7% plant height, grain yield, straw yield and test weightunder pot condition and also 29.4%, 27.5%, 29.5% and 17.6% underfield condition, respectively. Similarlythese treatment combinations showed maximum nutrient acquisition and content of micronutrient viz.Fe, Cu, Mn and Zn in grain of wheat under both conditions. The results showed that the combinedapplication of indigenous PGPR,B. megaterium, A. chlorophenolicusandEnterobactercan be used asefficient microbial consortium for wheat production.&2014 Elsevier Ltd. All rights reserved
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