Abstract
Waterlogging is a common form of abiotic stress that severely impedes global soybean production. Targeting this issue, an experiment was carried out at Sher-e-Bangla Agricultural University during August–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 (CRD) with three replications consisting of 2 water levels (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, and GC-840). On the 15th day after sowing, plants were exposed to waterlogging for 12 days. Waterlogging remarkably declined the growth and yield of all the soybean genotypes compared to control. Reduced plant height, relative water content, above-ground fresh and dry weight, SPAD value, leaf area, number of leaves, branches, pods, seeds pod−1, 100-seed weight, and seed yield plant−1 were observed under waterlogging stress. Conversely, mortality rate and electrolyte leakage were increased under the same condition. The waterlogged plants showed delayed flowering and maturity compared with the control plants. However, among the 12 genotypes, Sohag, BARI Soybean-5, GC-840, BINAsoybean-1, and BINAsoybean-2 showed better waterlogging tolerance. These genotypes showed a greater number of adventitious roots in the base of their stem, which probably helped plants to thrive under waterlogging conditions.
Highlights
Plants are randomly revealed to unfavorable environmental circumstances, which are named as abiotic stresses, for instance, waterlogging, drought, salinity, heavy metal stress, high temperature, nutrient stress, radiation, and environmental pollution [1], and as a result pose a serious ultimatum to crop production
Soybean crops are usually intolerant to waterlogging stress [14]
Each treatment was compared to its corresponding control. ere were two sets of pots in the experiment: one set was for taking growth and physiological data and another was for measuring yield data
Summary
Plants are randomly revealed to unfavorable environmental circumstances, which are named as abiotic stresses, for instance, waterlogging, drought, salinity, heavy metal stress, high temperature, nutrient stress, radiation, and environmental pollution [1], and as a result pose a serious ultimatum to crop production. Waterlogging in cultivated areas is a common abiotic stress which has severe influences on the composition and production of soybean [2, 3] and most crops’ species worldwide [4, 5]. Tides, floods, storms, and lack of adequate drainage facilities are the causes of waterlogging stress in plants [6]. Waterlogging stress causes hypoxic (O2 deficient) condition, which affects aerobic respiration. Over the course of time, the stress switched to an anoxic (O2 absent) condition, which causes inhibition of respiration [8], limitation of energy, deposition of noxious compounds (e.g., lactate), and loss of carbon (through the loss of ethanol from the roots) [9]. Voesenek and Bailey-Serres [12] stated that waterlogging stress posed O2 deficiency in the soil, which triggered
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