SCREENING OF SOYBEAN GENOTYPES FOR WATERLOGGING STRESS TOLERANCE AND UNDERSTANDING THE PHYSIOLOGICAL MECHANISMS

Abstract

One of the most exaggerated factors which are liable for diminishing crop yield is abiotic stress that comes up as a potent intimidation to worldwide food security in proceeding decades. Soil waterlogging in cultivated areas is a common abiotic stress which has severe influences on soybean composition and production worldwide. Focusing on that issue, an experiment was carried out at Sher-e-Bangla Agricultural University, during the month from August to November 2019 to screen out the waterlogging tolerance and yield performances of selected soybean genotypes. The experiment was laid out in a completely randomized design with three replications. The experiment consisted of 2 water level conditions (control and waterlogging) and 12 genotypes (Sohag, BARI Soybean-5, BINAsoybean-1, BINAsoybean-2, BINAsoybean-3, BINAsoybean-5, BINAsoybean-6, SGB-1, SGB-3, SGB-4, SGB-5, GC-840). On 15 th days after sowing (DAS), plants were revealed to waterlogging for 12 days period. The waterlogging stress reduced plant height, relative water content (RWC), above-ground fresh weight plant -1 , above-ground dry weight plant , SPAD value, leaf area plant -1 , number of leaves plant iii -1 , number of branches plant , number of pods plant -1 , number of seeds pod -1 , 100-seed weight, seed yield plant , stover yield, biological yield, whereas increased mortality rate and electrolyte leakage. The waterlogged plants showed delayed flowering and maturity than their respective control plants. It can be concluded that waterlogging remarkably declined the growth and yield of all the soybean genotypes in comparison with the control plants. Among the 12 genotypes Sohag, BARI Soybean-5, GC-840, BINAsoybean-1, BINAsoybean2 performed better than the other genotypes under waterlogging. These genotypes

showed a greater number of adventitious roots in their stem under waterlogging stress,

which probably helps the plants to thrive under waterlogging condition.