水稻播期—高温天气互作效应研究进展——生长发育、产量响应与高温适应策略

A review on the interaction effects of rice sowing date and high-temperature weather: Growth and development, yield responses, and high-temperature adaptation strategies

  • 摘要: 在气候变暖的背景下,水稻生产面临着高温胁迫的挑战,其生长发育和产量形成均受到威胁。为应对这一挑战,需总结播期对水稻生长和产量的影响及对高温的适应策略,以期通过优化播期缓解高温对水稻生产造成的不利影响,为高温背景下水稻增产稳产提供科学依据与参考。文章以水稻为研究对象,系统综述了不同播期下水稻生长发育、产量形成的研究进展,并深入探讨了高温适应策略及高温天气下的适宜播期选取。研究发现,播期的改变会导致水稻生育过程中的气象条件差异,进而明显影响水稻对温光资源的利用效率、各生育期长短以及干物质的积累转运和分配;播期的提前或推迟则会对有效穗数、每穗粒数、结实率和千粒重等产量构成因子产生影响,改变水稻源库结构,进而影响产量形成。针对高温胁迫导致的水稻生长、生理和产量危害,可以采取适当防御措施:培育耐热水稻品种、改善水肥管理模式、应用外源生长调节剂以及播期调控。在江南、华南等早稻区提前播期可规避灌浆期高温,江苏、湖北等中晚稻区适度推迟播期可错开抽穗期高温窗口,而江西地区则需要根据稻季特性实施差异化调整。针对当前研究不足,未来应增加对不同生育期水稻品种在多生态区的系统研究,并深入探究播期对水稻光合性能、激素调节、抗逆生理等过程的影响,明确高温背景下的播期效应,以便于不同生态区适宜播期的选取,提炼出具有区域适应性的、精细化的播期窗口;针对高温威胁,未来需结合气候预测、水稻生长模型和高温预警模型,建立基于气候情境的播期动态优化系统,同时将播期调控与优化水肥管理、选育耐高温水稻品种及外源生长调节剂喷施等措施综合应用,实现避害与耐害相协同,保障水稻稳产增产。

     

    Abstract: Against the background of climate warming, rice production is facing the challenge of heat stress, which threatens its growth, development, and yield formation. To address this challenge, it is necessary to summarize the effects of sowing date on rice growth and yield as well as adaptation strategies to high temperature, aiming to mitigate the adverse effects of high temperature on rice production by optimizing sowing date, and to provide scientific basis and referen-ce for increasing and stabilizing rice yield under high temperature conditions. This paper took rice as the research object, systematically reviewed the research progress on rice growth, development, and yield formation under different sowing dates, and deeply explored high temperature adaptation strategies and the selection of suitable sowing dates under hot weather conditions. The study found that changes in sowing date led to differences in meteorological conditions during the rice growth period, which greatly affected the efficiency of rice in utilizing temperature and light resources, the length of each growth stage, and the accumulation, transport and distribution of dry matter. Advancing or delaying the sowing date also affected yield component factors such as effective panicle number, grain number per panicle, seed setting rate, and thousand-grain weight, altered the source-sink structure of rice, and thus influenced yield formation. In response to the damage to rice growth, physiology, and yield caused by heat stress, appropriate mitigation measures could be adopted: breeding heat-tolerant rice varieties, improving water and fertilizer management practices, applying exogenous growth regulators, and regulating sowing date. In early rice regions such as regions south of the Yangtze River and southern China, advancing the sowing date could avoid high temperature during the grain-filling stage; in middle-late rice regions such as Jiangsu and Hubei, appropriately delaying the sowing date could avoid the high-temperature window at the heading stage; while in Jiangxi, differentiated adjustments were needed according to the characteristics of the rice season. In view of current research gaps, future studies should increase systematic research on rice varieties with different growth durations across multiple ecological regions, deeply explore the effects of sowing date on physiological processes such as photosynthetic performance, hormone regulation, and stress resistance, clarify the sowing date effect under high temperature background, and facilitate the selection of suitable sowing dates for different ecological regions, thereby refining regionally adaptive and precise sowing date windows. To address the threat of high temperature, it is necessary to establish a dynamic sowing date optimization system based on climate scenarios by integrating climate prediction, rice growth models, and high temperature warning models. At the same time, sowing date regulation should be combined with optimized water and fertilizer management, breeding of heat-tolerant rice varieties, and application of exogenous growth regulators to achieve synergy between avoidance and tolerance, thereby ensuring stable and high rice yields.

     

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