IMPACT OF PLANT GROWTH PROMOTING BACILLUS SUBTILIS ON GROWTH AND PHYSIOLOGICAL PARAMETERS OF BASSIA INDICA (INDIAN BASSIA) GROWN UDDER SALT STRESS

Abstract

In this study, the role of a salt-tolerant plant growth-promoting bacterium (PGPR), Bacillus subtilis, in the alleviation of salinity stress during the growth of Indian bassia (Bassia indica [Wight] A.J. Scott), was studied under ccontrolled growth chamber conditions following seed inoculation. Physiological parameters such as neutral and phospholipids, fatty acid composition as well as photosynthetic pigments, were investigated. Salinity inhibited shoot and root length by 16 and 42%, dry weight by 37 and 23% respectively and negatively affected physiological parameters. Inoculation of unstressed and saltstressed Indian bassia with B. subtilis significantly improved root and shoot growth, total lipid content, the phospholipid fraction, photosynthetic pigments (chlorophyll a and b and carotenoid contents) and also increased oleic (C18:1), linoleic (C18:2) and linolenic (C18:3) acids in plant leaves compared to uninoculated plants. The salt-tolerant PGPR, B. subtilis could act synergistically to promote the growth and fitness of Indian bassia plants under salt stress by providing an additional supply of an auxin (IAA) and induce salt stress resistance by reducing stress ethylene levels.