%A CHEN Jing, REN Bai-Zhao, ZHAO Bin, LIU Peng, ZHANG Ji-Wang %T Regulation of leaf-spraying glycine betaine on yield formation and antioxidation of summer maize sowed in different dates %0 Journal Article %D 2022 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2022.13021 %P 1502-1515 %V 48 %N 6 %U {https://zwxb.chinacrops.org/CN/abstract/article_7391.shtml} %8 2022-06-12 %X

In order to explore the regulation of leaf-spraying glycine betaine on yield formation and antioxidation in summer maize, Jingnongke 728 (JNK) and Denghai 618 (DH) were selected as experimental materials at three different sowing dates of June 5 (early sowing date, E), June 15 (normal sowing date, N), and June 25 (late sowing date, L) from 2019 to 2020. Besides, two leaf-spraying time treatments were conducted by using 10 mmol L-1 glycine betaine (GB) and clear water (CK) at V6 and V12 stages. The results showed that compared with CK, the yield of summer maize JNK and DH after spraying glycine betaine increased by 3.05%-12.81% and 2.08%-7.83%, respectively. The average total number of florets of JNK obtained in the different treatment of E, N, and L increased by 5.09%, 4.70%, and 2.27%, respectively, which was not notably changed among DH in 2019. In contrast, the average total number of florets of DH at the sowing dates of E, N, and L increased by 8.28%, 3.95%, 4.81%, respectively, which was not notably changed among JNK in 2020 after spraying betaine. The kernels per ear increased by 0.22%-6.45%, and the 100-kernel weight of E, N, and L increased by 0.88, 0.06, and -0.46 g, respectively. In addition, the activities of SOD, POD, and CAT increased by 1.23%, 3.36%, and 3.20%, respectively, while the content of MDA decreased by 11.73%. In conclusion, spraying betaine could reduce the yield difference at different sowing dates and was beneficial to improve the productivity of summer maize at different sowing dates.