Screening of Soybean Genotypes for Waterlogging Stress Tolerance and Understanding the Physiological Mechanisms

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.

Physiological Comparison of Wheat and Maize Seedlings Responses to Water Stresses

“…Azizi, et al [29] explained a significantly lower leaf RWC in flooded Populus euphratica by limited water uptake by the plant root system. A similar decline in leaf water content during flooding stress was seen in sorghum and soybean [30,31].…”

The intervention of classical and molecular breeding approaches to enhance flooding stress tolerance in soybean – An review

“…Flood stress reduced the protein concentration and deactivated APX in submerged soybean seedlings compared to the control, as Damanik et al (2016) studied earlier. Sathi et al (2022) observed that flooding stress increased the mortality rate and electrolyte leakage in soybean. The plant showed a delayed flowing pattern and maturity compared to control conditions (Sathi et al, 2022).…”

“…Sathi et al (2022) observed that flooding stress increased the mortality rate and electrolyte leakage in soybean. The plant showed a delayed flowing pattern and maturity compared to control conditions (Sathi et al, 2022). Flood stress decreases the rate of respiration in roots (Wegner, 2010), and causes a decline in energy resources, loss of carbon, and deposition of noxious compounds, mainly lactate (Tamang et al, 2014).…”

“…One strategy is the quiescence plan, where plants do not extend shoots under flooding to lessen energy and carbohydrate consumption but continue to grow after stress. Sathi et al (2022) revealed that soybean genotypes developed more adventitious roots in their stem, which helped plants thrive under water logging conditions (Sathi et al, 2022). Soybean plants develop aerenchyma tissue in roots, nodules, and hypocotyls which may ease the anoxia by enabling oxygen transport (Ploschuk et al, 2022).…”

“…The screening and selection of flood-tolerant soybean cultivars have been practiced to ensure yield stability. It is significant to breed flood-tolerant soybean cultivars for seed production in areas of heavy rainfall (Sathi et al, 2022). In an earlier study, Ali et al (2018) screened 11 soybeans cultivars against flood stress.…”