中国水稻科学2025，Vol.39Issue(5)：665-678,14.DOI:10.16819/j.1001-7216.2025.240904
不同光照条件下减穴稳苗配置对水稻茎鞘干物质积累转运特性的影响
Effects of Reducing Hill Density While Maintaining Plant Population on Dry Matter Accumulation and Transport in Rice Stem and Sheath Under Different Light Conditions
摘要
Abstract
[Objective]To clarify the effect of field configuration on dry matter accumulation and transport of culm and sheath under low light stress,and to provide a theoretical and practical basis for improving optimum canopy establishment technology in low light rice growing areas[Methods]Using Yixiangyou 2115 as the material,experiments with different light conditions(natural light and 50%shading)and field configurations[conventional dense planting(CDP)and reducing hill density while maintaining plant population(RHMPP)]were conducted in Hanyuan County and Wenjiang District of Sichuan Province from 2021 to 2022.The effects of field configuration on dry matter accumulation and transport in rice internodes and leaf sheaths under different light conditions were studied.[Results](1)Except for the Wenjiang site in 2022,low light stress significantly reduced the dry matter weight of individual internode and leaf sheath at maturity,which in turn significantly decreased the total dry matter weight of internodes and leaf sheaths by 22.68%-30.12%and 6.45%-15.64%,respectively,but significantly increased their total dry matter transport amount,transport rate,and contribution rate.(2)Compared with CDP,RHMPP could effectively increase the total dry matter weight of internodes(except at Wenjiang site under low light stress in 2022)and leaf sheaths during different growth stages under different light conditions,and promote the transport and reutilization of dry matter in internodes and leaf sheaths under low light stress,resulting in a 1.51%-6.03%and 5.70%-10.37%increase in single-panicle weight at maturity at Wenjiang and Hanyuan sites,respectively.(3)Under different light conditions,the correlation between grain yield,quality and dry matter accumulation and transport characteristics differed significantly.Under low light stress,the dry matter transport amount,transport rate,and contribution rate of internodes were positively correlated with grain yield,but highly significantly negatively correlated with the chalky grain rate and chalkiness degree.[Conclusion]Under low light stress,rice maintains assimilate supply to panicles by enhancing the transport and reuse of culm and sheath,especially the dry matter of internodes.RHMPP,by improving pre-heading dry matter accumulation in the internodes and leaves promotes their transport thereby reducing the adverse effects of low light stress on rice yield and quality.关键词
水稻/弱光胁迫/田间配置/茎鞘/物质积累转运Key words
rice/low light stress/field configuration/stem and sheath/dry matter accumulation and transport引用本文复制引用
刘钰婷,王丽,程红,黄蓉,李奥运,胡文,胡忠,任万军,邓飞,周星,何辰延,李秋萍,艾小凤,袁玉洁,刘睿,杨景文,刘婷婷..不同光照条件下减穴稳苗配置对水稻茎鞘干物质积累转运特性的影响[J].中国水稻科学,2025,39(5):665-678,14.基金项目
国家重点研发计划资助项目(2022YFD2300701) （2022YFD2300701）
国家自然科学基金资助项目(32372217 （）
U20A2022). （）
