PJB-2018-279
AUXIN PRODUCTION BY PLANT GROWTH PROMOTING RHIZOBACTERIA AND ITS ASSOCIATION WITH YIELD OF WHEAT (Triticum aestivum L.) UNDER DROUGHT
MUHAMMAD AOWN SAMMAR RAZA
Abstract
Azospirillum, Bacillus, Rhizobium, Enterobacter and Moraxella were isolated from the rhizosphere of Acacia nilotica to control drought stress in wheat (Triticum aestivum L.). Auxin production by plant growth promoting rhizobacteria was measured by the Ultra High Performance Liquid Chromatography (UPLC) in vitro. Azospirillum brasilense Azo-1 produced highest Indole-3-acetic acid of 6.3 μg ml-1. Pot experiments were conducted at different water regimes to determine the growth enhancement of wheat crop by rhizobacteria. At 10% field capacity (highest water stress) shoot length was significantly improved by rhizobacteria. A. brasilense Azo-1 inoculation increased 31.60 % spike length, 39.31 % spikelets per spike, 61.94% seed weight as compare to the untreated seeds at 10 % FC. It is concluded that drought tolerance rhizobacteria help to improve plant productivity under drought stress.
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