title: Growth promotion of wheat seedlings by Exiguobacterium acetylicum 1P (MTCC 8707) a cold tolerant bacterial strain from the Uttarakhand Himalayas.
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.
authors.affiliation: Vivekananda Institute of Hill Agriculture, Indian Council of Agricultural Research, Almora, 263 601 India.
authors.forename: G
authors.initials: G
authors.lastname: Selvakumar
authors.forename: S
authors.initials: S
authors.lastname: Kundu
authors.forename: Piyush
authors.initials: P
authors.lastname: Joshi
authors.forename: Sehar
authors.initials: S
authors.lastname: Nazim
authors.forename: A D
authors.initials: AD
authors.lastname: Gupta
authors.forename: H S
authors.initials: HS
authors.lastname: Gupta
keywords: Cold tolerance; Exiguobacterium acetylicum; Plant growth promotion