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Abstract
The study was conducted to evaluate the germination, physiological responses, yield-related traits, and seed yield of three mungbean varieties, viz. DXVN7, DXVN5, and DX11, under waterlogging coditions in the 2019 Summer. In experiment 1, the seeds of the three mungbean varieties were immersed in distilled water in Petri dishes for 12, 24, 36, 48, and 72h. Afterwards, water was removed and the percentage of germinated seeds was calculated at 84h after sowing. In experiment 2, plants were waterlogged at the seedling stage (25 days after germination) for 3, 6, and 9 days. Waterlogging depth was maintained at 3cm above the soil surface. Physiological traits were determined at the recovery period after termination of waterlogging (45 days after germination). The results showed that waterlogging significantly decreased germination percentages, plant height, root dry weight, leaf relative water content (RWC), SPAD value, Fv/Fm index, leaf photosynthesis, total dry weight, and seed yield of all varieties. Germination percentages at 12 and 24h of waterlogging were not significantly affected, whereas germination was significantly reduced at up to 36h of waterlogging. Seventy-two hours of waterlogging caused failure in germination. Nine days of waterlogging at the seedling stage adversely affected the physiological traits and seed yield of the mungbean varieties with 31% of yield reduction. Meanwhile, plants grew better at 3 days of waterlogging. Among the three varieties, DXVN7 showed the best adaptability under waterlogging conditions, attaining the highest seed germination and yield.
Highlights
IntroductionMungbean (Vigna radiate (L.) Wilczek) is a popular andVu Tien Binh & Sorgan S
Mungbean (Vigna radiate (L.) Wilczek) is a popular andVu Tien Binh & Sorgan S
The results showed that waterlogging significantly decreased germination percentages, plant height, root dry weight, leaf relative water content (RWC), SPAD value, Fv/Fm index, leaf photosynthesis, total dry weight, and seed yield of all varieties
Summary
Mungbean (Vigna radiate (L.) Wilczek) is a popular andVu Tien Binh & Sorgan S. Waterlogging is considered one of the major factors affecting the growth and yield of many crops. Mungbean cannot withstand soil waterlogging, during the early stages of growth (Singh & Singh, 2011). Waterlogging reduces oxygen concentrations around the roots of the plants, so the plants show wilting of their leaves even when enclosed by the excess of water, which affects water and nutrient uptake (Sairam et al, 2008) and inhibits nodule activity and nitrogen fixation (Kumar et al, 2013). Waterlogging has an adverse effect on the growth and development of the plant, biomass production, pod setting, and seed yield by affecting some physiological processes. The main physiological effect of waterlogging is the inhibition of photosynthesis (Ahmed et al, 2006) that is directly related to the stomatal limitation, carbon assimilation, and disturbance in plant respiratory metabolism (Dat et al, 2004)
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