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• W4289929823 abstract "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 interesting to investigate proper nitrogen (N) application strategy for alleviating grain yield and quality loss of rice exposed to light deficiency stress. 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 a 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, and head rice, and amylose content, while increased (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, while increased grain protein content and setback, contributing to a similar overall palatability to non-shading. Our results suggested severe grain yield and quality penalty of rice when subjected to shading after heading. NDP improved NSC remobilization, harvest index, and sink-filling efficiency, and alleviated yield loss under shading. Besides, NDP would maintain milling, appearance, and cooking and eating qualities of rice under shading. The proper N management with a decreased panicle N rate could be adopted to mitigate the negative effects of shading on rice grain yield and grain quality." @default.
• W4289929823 created "2022-08-06" @default.
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• W4289929823 date "2023-07-01" @default.
• W4289929823 modified "2023-09-27" @default.
• W4289929823 title "Decreased panicle N application alleviates the negative effects of shading on rice grain yield and grain quality" @default.
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• W4289929823 doi "https://doi.org/10.1016/j.jia.2022.08.045" @default.
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