Effects of Exogenous Spraying Brassinolide on Waterlogging Tolerance of Sesame under Waterlogging Stress at Flowering Stage
In order to study the effects of waterlogging stress on growth and physiological characteristics of sesame at flowering stage and the regulation effect of 24-epibrassinolide on waterlogging stress of sesame,in this study,using a waterlogging tolerant sesame variety Shangzhi 189 and a waterlogging sensitive sesame variety Zhengzhi 13 as experimental materials,taking the potted plant method,the treatment of foliar spraying of 24-epibrassinolide(0.01,0.03,and 0.05 mg/kg),followed by continuous flooding treatment for 36 hours,and 5 days of normal temperature recovery after waterlogging stress was conducted.The indicators including root growth,antioxidant system,and osmotic regulators of sesame plants were measured.The results showed that under waterlogging stress,the photosynthetic efficiency,antioxidant enzyme activity,and osmotic regulator content of the two sesame varieties significantly decreased,especially the waterlogging sensitive variety Zhengzhi 13.Compared with the treatment without spraying(CK2),when the mass concentration of brassinolide was 0.03 mg/kg,the plant height,stem diameter,and lateral root number of the waterlogging tolerant variety Shangzhi 189 increased by 9.36%,8.66%,12.82%,the soluble protein content significantly increased by 31.01%.When the massconcentration of brassinolide was 0.05mg/kg,the plant height of waterlogging sensitive sesame variety Zhengzhi 13 increased by 9.96%,the lateral root number and dry weight increased by 14.92%and 14.28%,respectively,and the activities of SOD and POD increased by 13.01%,13.88%.In conclusion,spraying brassinolide could significantly improve the waterlogging tolerance of sesame under waterlogging stress at the flowering stage,promote lateral root growth of sesame,increase protective enzyme activity and photosynthetic capacity,and other indicators,which was beneficial for the growth recovery of sesame plants after waterlogging stress.Among them,the best effect of recovery growth of waterlogging tolerant variety Shangzhi 189 was induced by spraying 0.03 mg/kg,and the best effect of recovery growth of waterlogging sensitive variety Zhengzhi 13 was induced by spraying 0.05 mg/kg.
万方数据
维普
