Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 20, Issue 2, 2018; Page No.(575-581)

A STRESS TOLERANT SPHINGOMONAS FROM TRANSHIMALAYAN RHIZOSPHERIC SOIL IMPROVES GROWTH OF TOMATO

D. DOLKAR, P. DOLKAR, O.P. CHAURASIA AND T. STOBDAN

Abstract

A temperature-, pH- and salt-tolerant Sphingomon as a quatilis PS10 was isolated from Sea buckthorn (Hippophae rhamnoides L.) rhizosp here growing in the Indian trans-Himalaya. PS10 was capable of solubilizing insoluble inorganic phosphate under different stress conditions viz. 4–40°C, 1– 5% salt concentration and pH 4–12 range. The isolate exhibit plant growth promoting traits viz. auxin, siderophore and hydrogen cyanide production. Tomato seed bacterization resulted in 37% and 34.5% increased in shoot and root length, respectively. Inoculations of tomato seedling with PS10 promote plant growth in pot trial experiments. Increased in fruit yield due to PS10 treatment was 10.4% and 33% over controls in open and shade net conditions, respectively. The result of this study provides a strong basis for further development of this isolate as a bioinoculants in horticultural crops in high altitude regions.

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