Low Temperature in Early Grain Filling Period of Spring Maize: Effect on Yield Components

doi:10.11924/j.issn.1000-6850.casb2021-0620

Abstract

Abstract:

This study aims at studying the effect of low temperature injury on grain filling of spring maize and determining the agro-meteorological indexes of low temperature injury in the grain filling period in northeast China. Pot planted spring maize was subjected to different levels of low temperature (mean 15℃, 17℃ and 19℃) in early grain filling period for 3, 5 and 7 days in the artificial climate chamber. The results showed that low temperature treatments decreased the number of kernels per ear, the kernel weight per ear, 100-kernel weight and the chlorophyll content, postponed the maturing period and increased the length of ear bald tip and the water content of kernels. As a result, the yield was decreased in various degrees. The lower the temperature and the longer the duration of low temperature, the higher the yield reduction of maize was. The yield of maize decreased the most under the treatment of 7 days at 15℃ among all the treatments, and compared with the control treatment, the kernel weight per ear was reduced by 32.4% and the 100-kernel weight was reduced by 9.2%. Therefore, low temperature in the early kernel filling period could result in the double reduction of kernel setting rate and kernel dry matter content, which is the most important factor affecting the yield components of spring maize.

Key words: spring maize, early grain filling period, low temperature stress experiment, effect of chilling injury, yield reduction

CLC Number:

LI Jianping, LIU Yuxi, GAO Yan, REN Jingquan, SUN Yue, GUO Chunming, WANG Jing. Low Temperature in Early Grain Filling Period of Spring Maize: Effect on Yield Components[J]. Chinese Agricultural Science Bulletin, 2022, 38(12): 7-12.

Figures/Tables 8

References 41

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