Decreased panicle N application alleviates the negative effects of shading on rice grain yield and grain quality  

作　　者：WEI Huan-he GE Jia-lin ZHANG Xu-bin ZHU Wang DENG Fei REN Wan-jun CHEN Ying-long MENG Tian-yao DAI Qi-gen 

机构地区：[1]Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Research Institute of Rice Industrial Engineering Technology/College of Agriculture,Yangzhou University,Yangzhou 225009,P.R.China [2]Institutes of Agricultural Sciences and Technology Development/Joint International Research Laboratory of Agriculture and Agri-Product Safety,Ministry of Education/College of Agriculture,Yangzhou University,Yangzhou 225009,P.R.China [3]Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province/Key Laboratory of Crop Ecophysiology and Farming System in Southwest China,Ministry of Agriculture and Rural Affairs/College of Agronomy,Sichuan Agricultural University,Chengdu 611130,P.R.China

出　　处：《Journal of Integrative Agriculture》2023年第7期2041-2053,共13页农业科学学报（英文版）

基　　金：This work was financed by the National Natural Science Foundation of China(U20A2022,31901448 and 32001466);the Postdoctoral Research Foundation of China(2020M671628 and 2020M671629);the Natural Science Foundation of the Jiangsu Higher Education Institutions,China(19KJB210004);the Key Research and Development Program of Jiangsu Province,China(BE2019343);the Priority Academic Program Development of Jiangsu Higher Education Institutions,China.

摘　　要：Light deficiency is a growing abiotic stress in rice production.However,few studies focus on shading effects on grain yield and quality of rice in East China.It is also essential to investigate proper nitrogen(N)application strategies that can effectively alleviate the negative impacts of light deficiency on grain yield and quality in rice.A two-year field experiment was conducted to explore the effects of shading(non-shading and shading from heading to maturity)and panicle N application(NDP,decreased panicle N rate;NMP,medium panicle N rate;NIP,increased panicle N rate)treatments on rice yield-and quality-related characteristics.Compared with non-shading,shading resulted in a 9.5-14.8%yield loss(P<0.05),mainly due to lower filled-grain percentage and grain weight.NMP and NIP had higher(P<0.05)grain yield than NDP under non-shading,and no significant difference was observed in rice grain yield among NDP,NMP,and NIP under shading.Compared with NMP and NIP,NDP achieved less yield loss under shading because of the increased filled-grain percentage and grain weight.Shading reduced leaf photosynthetic rate after heading,as well as shoot biomass weight at maturity,shoot biomass accumulation from heading to maturity,and nonstructural carbohydrate(NSC)content in the stem at maturity(P<0.05).The harvest index and NSC remobilization reserve of NDP were increased under shading.Shading decreased(P<0.05)percentages of brown rice,milled rice,head rice,and amylose content while increasing(P<0.05)chalky rice percentage,chalky area,chalky degree,and grain protein.NMP demonstrated a better milling quality under non-shading,while NDP demonstrated under shading.NDP exhibited both lower chalky rice percentage,chalky area,and chalky degree under non-shading and shading,compared with NMP and NIP.NDP under shading decreased amylose content and breakdown but increased grain protein content and setback,contributing to similar overall palatability to non-shading.Our results suggested severe grain yield and quality penalty of rice when subj

关 键 词：rice grain yield grain quality SHADING panicle N application 

分 类 号：S511[农业科学—作物学]