外源褪黑素对干旱胁迫下鼓粒期大豆籽粒发育的影响OA北大核心CSTPCD

In order to explore the effect of exogenous melatonin on soybean seeds development under drought stress,the drought-sensitive soybean variety Suinong 26 and the drought-tolerant variety Kangxian 9 were used as test materials,by potting method,under drought stress,melatonin foliar spraying was carried out at R5 stage,and the melatonin concentration was 100 μmol·L-1,samples were taken after 5,10 and 15 days of treatment to study the effect of exogenous melatonin on soybean grain development under drought stress was studied.The results showed that exogenous melatonin treatment could improve the activities of soybean sugars,starches,and key enzymes for carbon metabolism under drought stress,and was beneficial to improve the level of carbon metabolism.At the same time,exogenous melatonin treatment significantly increased the activities of key enzymes(NR,GS,GOGAT and GDH)of soybean under drought stress,promoted the accumulation of nitrogen in plants,and was conducive to nitrogen assimilation and transportation.In conclusion,exogenous melatonin treatment improved soybean drought tolerance by regulating the activities of key enzymes in soybean carbon and nitrogen metabolism under drought stress,and ultimately increased soybean yield under drought stress.