Rhizosphere competent <Emphasis Type="Italic">Pantoea agglomerans</Emphasis> enhances maize (<Emphasis Type="Italic">Zea mays</Emphasis>) and chickpea (<Emphasis Type="Italic">Cicer arietinum</Emphasis> L.) growth,without altering the rhizosphere functional diversity |
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Authors: | Aradhana Mishra Puneet Singh Chauhan Vasvi Chaudhry Manisha Tripathi Chandra Shekhar Nautiyal |
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Institution: | (1) Division of Plant Microbe Interactions, National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India; |
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Abstract: | Plant growth promoting Pantoea agglomerans NBRISRM (NBRISRM) was able to produce 60.4 μg/ml indole acetic acid and solubilize 77.5 μg/ml tri-calcium phosphate under
in vitro conditions. Addition of 2% NaCl (w/v) in the media induced the IAA production and phosphate solubilization by 11%
and 7%, respectively. For evaluating the plant growth promotory effect of NBRISRM inoculation a micro plot trial was conducted
using maize and chickpea as host plants. The results revealed significant increase in all growth parameters tested in NBRISRM
inoculated maize and chickpea plants, which were further confirmed by higher macronutrients (N, P and K) accumulation as compared
to un-inoculated controls. Throughout the growing season of maize and chickpea, rhizosphere population of NBRISRM were in
the range 107–108 CFU/g soil and competing with 107–109 CFU/g soil with heterogeneous bacterial population. Functional richness, diversity, and evenness were found significantly
higher in maize rhizosphere as compared to chickpea, whereas NBRISRM inoculation were not able to change it, in both crops
as compared to their un-inoculated control. To the best of our knowledge this is first report where we demonstrated the effect
of P. agglomerans strain for improving maize and chickpea growth without altering the functional diversity. |
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