College of Resources and Environmental Sciences, China Agricultural University, Beijing, China.
Cultivation and Farming Research Institute, Heilongjiang Academy of Agricultural Sciences, Harbin, China.
J Sci Food Agric. 2024 Dec;104(15):9312-9323. doi: 10.1002/jsfa.13754. Epub 2024 Jul 27.
This study aims to quantify the impacts of chilling at the grain filling stage on rice yield and grain quality. A factorial experiment with four levels of temperature and duration of chilling treatments at the early and late grain filling stages was conducted in 2017, 2018 and 2019.
Per 10 °C·day increase in the accumulated cooling degree day at the early and late grain filling stages, the rice emergence-maturity duration was delayed by 0.8% (0.6%) and rice yield decreased by 2.2% (1.7%). Chilling at the early grain filling stage decreased the rice heading rate, while chilling at the late grain filling stage increased rice amylose but decreased protein content. For chilling treatment at the early grain filling stage, rice yield and grain quality were mainly correlated with seed-setting rate, whereas for chilling treatment at the late grain filling stage the rice yield and grain quality were mainly correlated with 1000-grain weight.
This study improved the understanding of how chilling at the grain filling stages affects rice phenology, yield and grain quality, providing a theoretical basis for maintaining rice yield while ensuring grain quality. The results could be used to guide the rice-growing community in combating chilling at grain filling stages. © 2024 Society of Chemical Industry.
本研究旨在量化灌浆期低温胁迫对水稻产量和品质的影响。2017、2018 和 2019 年进行了一项四因素温度处理和灌浆期早、晚期低温胁迫持续时间的析因试验。
灌浆期早、晚期每增加 10°C·天的冷却度日，水稻抽穗成熟期延迟 0.8%（0.6%），产量降低 2.2%（1.7%）。灌浆期早期低温胁迫降低了水稻的结实率，而灌浆期晚期低温胁迫增加了稻米直链淀粉含量，降低了蛋白质含量。对于灌浆期早期的低温处理，水稻产量和品质主要与结实率相关，而对于灌浆期晚期的低温处理，水稻产量和品质主要与千粒重相关。
本研究提高了对灌浆期低温胁迫影响水稻物候、产量和品质的认识，为在保证稻米品质的同时维持水稻产量提供了理论依据。研究结果可以用来指导水稻种植户应对灌浆期低温胁迫。 © 2024 英国化学学会。
