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

• DOI: 10.1016/j.jia.2022.08.045
• Publication Date: 2022-08-06T03:52:40Z
• Authors: Huan-he WEI; Jia-lin GE; Xu-bin ZHANG; Wang ZHU; Fei DENG; Wan-jun REN; Ying-long CHEN; Tian-yao MENG; Qi-gen DAI
• Keywords: Shading; Panicle

Light deficiency is a growing abiotic stress in rice production, however, few studies focus on shading effects grain yield and quality of east China. It also interesting to investigate proper nitrogen (N) application strategy for alleviating loss exposed light stress. A two-year field experiment was conducted explore the (non-shading from heading maturity) panicle N (NDP, decreased rate; NMP, medium NIP, increased rate) treatments yield- quality-related characteristics. Compared with non-shading, resulted 9.5-14.8% (P<0.05), mainly due lower filled-grain percentage weight. NMP NIP had higher (P<0.05) than NDP under no significant difference observed among NDP, shading. achieved less because Shading reduced leaf photosynthetic rate after heading, as well shoot biomass weight at maturity, accumulation nonstructural carbohydrate (NSC) content stem maturity (P<0.05). The harvest index NSC remobilization reserve were percentages brown rice, milled head amylose content, while chalky percentage, area, degree, protein. demonstrated better milling exhibited both degree non-shading shading, compared NIP. breakdown, protein setback, contributing similar overall palatability non-shading. Our results suggested severe penalty when subjected heading. improved remobilization, index, sink-filling efficiency, alleviated Besides, would maintain milling, appearance, cooking eating qualities management could be adopted mitigate negative quality.