%A YU Hai-Yue,HAN Zi-Xuan,ZHANG Yu-Shi,DUAN Liu-Sheng,ZHANG Ming-Cai,LI Zhao-Hu %T Regulation of coronatine on the grain filling characteristics and starch synthesis in maize kernels %0 Journal Article %D 2019 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2019.93007 %P 1535-1543 %V 45 %N 10 %U {https://zwxb.chinacrops.org/CN/abstract/article_6787.shtml} %8 2019-10-12 %X

Maize yield is strong linked to grain filling characteristics, which one important strategy to be improved for achieving high yield of maize. This study was conducted to clarity the effects of coronatine (COR) on grain filling characteristics, starch content, activities of starch biosynthetic enzymes and their gene expression in maize kernels. The two-year field experiments showed that COR had a significant concentration effect on ear traits and yield of maize. The appropriate COR concentration of 1.0 mg L -1 could significantly reduce the length of bald tip of ear and increase the number of grains per ear and 1000-grain weight, which increased the maize yield. Meanwhile, high concentration of COR with 10 mg L -1 (COR 10) increased grain filling rate, but shortened the duration of grain filling, which led to reducing grain weight. However, COR 1.0 treatment increased grain filling rate, prolonged the duration of grain filling and increased grain weight. In addition, COR 1.0 significantly regulated the activities of AGPase, SSS, GBSS, and SBE during grain filling, and increased the expression levels of starch synthetic genes ZmSH1, ZmSH2, ZmWX1, and ZmAE1, which increased amylopectin, amylose and total starch contents. In conclusion, COR can regulate grain morphogenesis and dry matter accumulation in maize, providing a new technical method for maize production and efficient cultivation.