Study on osmoprotectant rhizobacteria to improve mung bean growth under drought stress

Abstract

Climate change leads to irregular rainwater availability for crops and thus enhances drought stress. Furthermore, nowadays we face climate disadvantages such as long dry season, short rainy season and high air temperature caused by climate change. This research aimed at studying the ability of osmoprotectant rhizobacteria isolates to support mung bean growth under drought stress. The rhizobacteria were isolated from mung bean’s rhizosphere. The results showed that isolates of strain Al24-k and Ver5-k produced glycine betaine 9.6306 mg g−1 cell, 1.7667 x 107 CFU g−1 soil and 11.4870 mg g”1 cell, 1.9667 x 107 CFU g−1 soil. The isolated rhizobacteria from mung bean’s rhizosphere under field capacity of soil moisture produced glycine betaine 6.8000 mg g−1 cell, 1.2556 x 107 CFU g−1 soil. Under 75% field capacity of soil moisture, isolates produced glycine betaine of 6.4059 mg g−1 cell, 1.3111 x 107 CFU g−1 soil, while under 50% from field capacity, the isolates produced glycine betaine of 7.4108 mg g−1 cell, 1.6667 x 107 CFU g−1 soil. The osmoprotectant rhizobacteria improved the resilience of mung bean to drought stress.