文献类型： 外文期刊

作者： Guo, Dong ¹ ; Chen, Chuanyong ³ ; Li, Xiangling ⁴ ; Wang, Rui ⁴ ; Ding, Zaisong ¹ ; Ma, Wei ¹ ; Wang, Xinbing ¹ ; Li, Congfeng ¹ ; Zhao, Ming ¹ ; Li, Ming ² ; Zhou, Baoyuan ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Key Lab Crop Physiol & Ecol, Minist Agr & Rural Affairs, Beijing, Peoples R China

2.Northeast Agr Univ, Coll Agr, Harbin, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Maize Res Ctr, Beijing, Peoples R China

4.Hebei Normal Univ Sci & Technol, Coll Agron & Biotechnol, Hebei Key Lab Crop Stress Biol, Qinhuangdao, Peoples R China

关键词： summer maize; sowing date; temperature conditions; photosynthetic capacity; grain yield

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Adjusting the sowing date to optimize temperature conditions is a helpful strategy for mitigating the adverse impact of high temperature on summer maize growth in the North China Plain (NCP). However, the physiological processes of variation in summer maize yield with sowing date-associated changes in temperature conditions around flowering remain to be poorly understood. In this study, field experiments with two maize varieties and three sowing dates (early sowing date, SD1, 21 May; conventional sowing date, SD2, 10 June; delay sowing date, SD3, 30 June) were conducted at Xinxiang of Henan Province in 2019 and 2020. Early sowing markedly decreased the daily mean temperature (T-mean), maximum temperature (T-max), and minimum temperature (T-min) during pre-silking, while delay sowing markedly decreased those temperatures during post-silking. Under these temperature conditions, both varieties under SD1 at 12-leaf stage (V12) and silking stage (R1) while under SD3 at R1 and milking stage (R3) possessed significantly lower malondialdehyde (MDA) content in leaf due to higher activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) compared to SD2. Therefore, SD1 at V12 and R1 stages and SD3 at R1 and R3 stages for both varieties showed significantly higher photosynthetic capacity, including higher SPAD, F-v/F-m, P-n, T-r, and G(s), which promoted greater pre-silking dry matter (DM) accumulation for SD1 to increase the kernel number, and promoted greater post-silking DM accumulation for SD3 to increase the kernel weight, eventually increased the grain yield of SD1 and SD3 compared to SD2. Results of regression analysis demonstrated that T-mean, T-max, and T-min values from V12 to R1 stages lower than 26.6, 32.5, and 20.3 degrees C are necessary for improving the kernel number, while T-mean, T-max, T-min, and accumulated temperature (AT) values from R1 to R3 stages lower than 23.2, 28.9, 17.3, and 288.6 degrees C are necessary for improving the kernel weight. Overall, optimal temperature conditions around flowering can be obtained by early (21 May) or delay (30 June) sowing to improve the kernel number or kernel weight due to improved photosynthetic capacity, eventually increasing the grain yield of summer maize in the NCP.