WATERLOGGED TOLERANCE OF SESAME GENOTYPES ON THE BASIS OF MORPHO-ANATOMICAL FEATURESAND YIELD
Waterlogging is an environmental factor that reduces gas exchange between plant tissues and the atmosphere and limits plant growth and yield and damages root and shoot structures. A pot experiment was conducted with four sesame genotypes viz. Rajshahi Khoyeri, Kistotil Chapai, Kathtil Chapai and Binatil-2 during March to June 2019. Four waterlogged treatments viz. Control, 24, 48 and 72 hours were imposed at flowering stage of the sesame genotypes. Plant height, shoot and root dry weight, total dry matter plant-1, capsules plant-1, number of seeds capsule-1, number of seeds plant-1, 1000-seed weight and seed yield plant-1 were significantly decreased with increasing water logging periods. Rajshahi Khoyeri produced the highest seed yield followed by Kathtil Chapai. Total dry matter reduction was less in Rajshahi Khoyeri and yield reduction was less in Kathtil Chapai under different water logging treatments. Root and stem anatomy of all the genotypes was investigated under control and 72 hours water logging and found that water logging at 72 hours partially damaged its epidermis, hypodermis and vascular bundle and adventitious roots were formed to help storage and exchange of gases within stressed plants to maintain a hypoxia tolerance pathway for survival.
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