Dissecting heat tolerance and yield stability in maize from greenhouse and field experiments

文献类型： 外文期刊

第一作者： Liu, Mayang

作者： Liu, Mayang;Sheng, Dechang;Liu, Xiaoli;Wang, Yuanyuan;Hou, Xinfang;Wang, Yuqi;Wang, Pu;Huang, Shoubing;Guan, Ling;Dong, Xin

作者机构：

关键词： extreme heat; maize; pollen; silk; yield stability

期刊名称：JOURNAL OF AGRONOMY AND CROP SCIENCE （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN： 0931-2250

年卷期： 2022 年 208 卷 3 期

页码：

收录情况： SCI

摘要： High temperature during flowering increasingly reduces maize yield with warming climate. Heat tolerance of maize is however not fully understood in the aspect of flowering characteristics and yield stability, especially in the female flowering patterns. Temperature-controlled greenhouse studies were conducted to test heat tolerances of four inbred lines and five hybrids, including 30/20 and 40/30 degrees C treatments during 15 days bracketing the silking stage. Field studies were conducted to determine yield stabilities of five hybrids at three stations including four field environments. In greenhouse study, fertility rate and kernel number per ear (KN/ear) of nine genotypes reduced from 34.41-83.03% and 162.0-653.7 at 30/20 degrees C to 0.68-23.13% and 0.3-332.5 at 40/30 degrees C, respectively, mainly due to reduced pollen shed weight (PSW), pollen viability (PV) and silking rate (SR) at 40/30 degrees C. Hybrids Chang7-2xQi319 and Chang7-2xXian2 showed significantly higher yields and KN/ear at 30/20 degrees C, but only Chang7-2xQi319 performed better at 40/30 degrees C. In field studies, Chang7-2xXian2, Xian2xZheng58, Qi319xXian2 and Chang7-2xQi319 were winning hybrids at specific environments. Chang7-2xXian2 showed the highest yield potential due to the larger ear size and KN/ear but a lower yield stability because of the lower PSW and PV. Chang7-2xQi319 combined high-yield potential and high-yield stability, which can be explained by large PSW, high PV and SR, and stable flowering pattern at different environments. Female flowering pattern (e.g. silking dynamics) is also a key determinant of high temperature tolerance and yield stability in maize. Hence, maize male and female organs should be equally concerned when achieving high and stable yield under different adverse environments in warming climate.

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