文献类型： 外文期刊
作者： Jiang, Zhengrong 1 ; Yang, Hongyi 1 ; Zhu, Meichen 1 ; Wu, Longmei 4 ; Yan, Feiyu 5 ; Qian, Haoyu 1 ; He, Wenjun 1 ; Liu, Dun 1 ; Chen, Hong 1 ; Chen, Lin 1 ; Ding, Yanfeng 1 ; Sakr, Soulaiman 3 ; Li, Ganghua 1 ;
作者机构： 1.Nanjing Agr Univ, Sanya Inst Nanjing Agr, Jiangsu Collaborat Innovat Ctr Modern Crop Prod, Key Lab Crop Physiol Ecol & Prod Management, Sanya 572000, Peoples R China
2.China Kenya Belt & Rd Joint Lab Crop Mol Biol, Nanjing 210095, Peoples R China
3.Univ Angers, Inst Agro, INRAE, IRHS,SFR 4207 QUASAV, F-49000 Angers, France
4.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Peoples R China
5.Huaiyin Inst Technol, Sch Life Sci & Food Engn, Huaian 223003, Peoples R China
关键词： Rice; Sink; Source; Sugar; Phytohormone
期刊名称：RICE （ 影响因子：5.5； 五年影响因子：5.8 ）
ISSN： 1939-8425
年卷期： 2023 年 16 卷 1 期
页码：
收录情况： SCI
摘要： Poor grain-filling initiation in inferior spikelets severely impedes rice yield improvement, while photo-assimilates from source leaves can greatly stimulate the initiation of inferior grain-filling (sink). To investigate the underlying mechanism of source-sink interaction, a two-year field experiment was conducted in 2019 and 2020 using two large-panicle rice cultivars (CJ03 and W1844). The treatments included intact panicles and partial spikelet removal. These two cultivars showed no significant difference in the number of spikelets per panicle. However, after removing spikelet, W1844 showed higher promotion on 1000-grain weight and seed-setting rate than CJ03, particularly for inferior spikelets. The reason was that the better sink activity of W1844 led to a more effective initiation of inferior grain-filling compared to CJ03. The inferior grain weight of CJ03 and W1844 did not show a significant increase until 8 days poster anthesis (DPA), which follows a similar pattern to the accumulation of photo-assimilates in leaves. After removing spikelets, the source leaves of W1844 exhibited lower photosynthetic inhibition compared to CJ03, as well as stronger metabolism and transport of photo-assimilates. Although T6P levels remained constant in both cultivars under same conditions, the source leaves of W1844 showed notable downregulation of SnRK1 activity and upregulation of phytohormones (such as abscisic acid, cytokinins, and auxin) after removing spikelets. Hence, the high sink strength of inferior spikelets plays a role in triggering the enhancement of source strength in rice leaves, thereby fulfilling grain-filling initiation demands.
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