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Acta Agronomica Sinica ›› 2025, Vol. 51 ›› Issue (2): 405-417.doi: 10.3724/SP.J.1006.2025.42032

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of low temperature and weak light stress during early grain filling on rice yield and quality

HU Ya-Jie1,GUO Jing-Hao1,CONG Shu-Min1,CAI Qin1,XU Yi1,SUN Liang1,GUO Bao-Wei1,XING Zhi-Peng1,YANG Wen-Fei2,*,ZHANG Hong-Cheng1,*   

  1. 1 Jiangsu Key Laboratory of Crop Cultivation and Physiology, Agricultural College of Yangzhou University / Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2 Jiangsu Xuhuai area Huaiyin Agricultural Science Research Institute, Huai’an 223001, Jiangsu, China
  • Received:2024-07-03 Revised:2024-09-18 Accepted:2024-09-18 Online:2025-02-12 Published:2024-10-11
  • Supported by:
    This study was supported by the National Nature Science Foundation of China (32372213, 31701350), the National Key Research Program of China (2022YFD1500404, 2023YFD2302200), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Abstract:

This study investigated the effects of low temperature (LT) and combined low temperature and weak light (LW) treatments during the early grain filling stage on rice yield, yield components, dry matter production, and rice quality. Two rice varieties, soft japonica rice Nanjing 9108 and conventional japonica rice Huaidao 5, were used as experimental materials. The gradient temperature in an artificial climate chamber was set to simulate the dynamic decrease in temperature during the early grain filling stage (from full heading to 20 days after full heading), with outdoor temperature and light conditions serving as the control (CK). The results showed that both LT and LW treatments reduced rice yield compared with CK. The yield reduction under LW was primarily due to a decrease in seed setting rate and 1000-grain weight. In contrast, LT reduced the seed setting rate but increased the 1000-grain weight. Both LT and LW treatments decreased the total dry matter weight and panicle dry weight, while dry matter accumulation in leaves and stem sheaths was higher compared with CK. Additionally, the SPAD values of leaf 1, leaf 2, and leaf 3 under LT and LW exhibited an increasing trend compared with CK. Enzymatic activities were also affected by LT and LW treatments. The activities of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) initially increased and then decreased, while the activity of ascorbate peroxidase (APX) increased. Moreover, the contents of malondialdehyde (MDA) and H2O2 were higher under LT and LW compared with CK. In terms of rice quality, LT improved rice processing quality and appearance quality compared with CK, while LW deteriorated rice processing quality. Under LT treatment, amylose content increased, whereas gel consistency, protein content, and taste value decreased. Under LW treatment, amylose content and gel consistency decreased, protein content increased, and taste value decreased. Consequently, both LT and LW treatments reduced the eating quality of rice.

Key words: rice, the early grain filling, low temperature and weak light, yield, quality

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