文献类型： 外文期刊

作者： Wang, Shiqiang ¹ ; Liang, Renmin ² ; Yang, Shanwei ³ ; Huang, Xumou ² ; Wei, Minchao ² ; Wei, Chunxiang ² ; Zhang, Xiuhua ² ; Wei, Zhanglan ² ; Pan, Yousheng ⁴ ; Wu, Hequan ⁵ ; Liao, Mingchuang ⁶ ; Wei, Chengxian ⁸ ; Huang, Liqiong ⁴ ; Zhao, Haihong ¹ ;

作者机构： 1.Hechi Univ, Guangxi Coll Univ Key Lab Exploitat & Utilizat Mic, Coll Chem & Biol Enginerring, Guangxi Key Lab Sericulture Ecol & Appl Intelligen, Hechi 546300, Peoples R China

2.Guangxi Acad Agr Sci, Agr Sci Res Inst Hechi City, Hechi Branch, Yizhou 546306, Peoples R China

3.Shandong Agr Univ Fertilizer Sci Tech Co Ltd, Tai An 271600, Peoples R China

4.Agr Technol, Extens Ctr, Hechi 546300, Peoples R China

5.Four Agr Technol Promot Stn, Hechi 546400, Luocheng Mulao, Peoples R China

6.Agr Rural Bur, Agr Serv Ctr, Hechi 546400, Luocheng Mulao, Peoples R China

7.Extens Ctr Stn, Hechi 546400, Luocheng Mulao, Peoples R China

8.Plant Protect Stn, Hechi 546300, Peoples R China

关键词： 1000-Grain weight; Grain filling rate; Grain starch accumulation; High-quality rice; Low temperature at booting

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：5.7； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2025 年 228 卷

页码：

收录情况： SCI

摘要： Low temperature at booting (LTB) reduces rice 1000-grain weight. Crucial enzymes associated with carbon and nitrogen metabolic pathways impact grain starch and protein synthesis, altering the grain filling rate and 1000grain weight. Unfortunately, limited research has been conducted on 1000-grain weight formation of highquality rice under LTB. This study examines the physiological reactions of cold-tolerant Longdao29 (LD29) and cold-sensitive Longdao18 (LD18) in response to LTB and normal-temperature conditions. In our study, LTB heavily reduced starch branching enzymes (SBE) and adenosine diphosphate glucose pyrophosphorylase (AGPase) activities (P < 0.05), reducing grain starch accumulation. The reduction in grain starch accumulation lowered the maximum grain filling rate, mean grain filling rate, the weight of grain at maximum grain filling rate, and grain filling rate at early filling (0-15 days after heading fully (DAH)), lowering in 1000-grain weight of upper-located branches of panicles and 1000-grain weight of primary segments of the middle and lower panicle portions. Moreover, LTB obviously enhanced the proline content and ornithine-delta-aminotransferase activity in leaves (P < 0.05), lowering proline dehydrogenase activity, leading to increased grain nitrogen accumulation, increasing grain filling rate at the middle and late filling stage (31-45 DAH) of LD18. However, it decreased the grain filling rate during the middle and late filling stages for LD29. Therefore, LTB can inhibit the activities of AGPase and SBE, decreasing grain starch accumulation and grain filling rate during the early filling stage, ultimately reducing the 1000-grain weight, with LD29 exhibiting greater sensitivity to LTB-induced weight reduction.