Growth promotion of wheat seedlings by <Emphasis Type="Italic">Exiguobacterium acetylicum</Emphasis> 1P (MTCC 8707) a cold tolerant bacterial strain from the Uttarakhand Himalayas |
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Authors: | G Selvakumar S Kundu Piyush Joshi Sehar Nazim A D Gupta H S Gupta |
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Institution: | (1) Vivekananda Institute of Hill Agriculture, Indian Council of Agricultural Research, Almora, 263601, Uttarakhand, India |
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Abstract: | Exiguobacterium acetylicum strain 1P (MTCC 8707) is a gram-positive, rod-shaped, yellow pigmented bacterium isolated from soil on nutrient agar plates
at 4°C. The identity of the bacterium was arrived on the basis of the biochemical characterization, BIOLOG sugar utilization
pattern and sequencing of the 16S rRNA gene. It grew at temperatures ranging from 4 to 42°C, with temperature optima at 30°C.
It expressed multiple plant growth promotion attributes such as phosphate solubilization, indole acetic acid (IAA), siderophore
and hydrogen cyanide (HCN) production, differentially at suboptimal growth temperatures (15 and 4°C). At 15°C it solubilized
phosphate (21.1 μg of P ml−1 day−1), and produced IAA (14.9 μg ml−1 day−1) in tryptophan amended media. Qualitative detection of siderophore production and HCN were possible at 15°C. At 4°C it retained
all the plant growth promotion attributes. Seed bacterization with the isolate, positively influenced the growth and nutrient
uptake parameters of wheat seedlings in glass house studies at suboptimal cold growing temperatures. |
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Keywords: | Cold tolerance Exiguobacterium acetylicum Plant growth promotion |
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