Kim Ju-Hee, Jo So-Hye, Moon Ji-Hyeon, Yang Seo-Yeong, Baek Jae-Kyeong, Song Yeong-Seo, Shon Ji-Young, Lee Hyeon-Seok
Crop Production & Physiology Division, National Institute of Crop Science, Rural Development Administration, Wanju-Gun, Republic of Korea.
Physiol Plant. 2025 Jan-Feb;177(1):e70132. doi: 10.1111/ppl.70132.
Precise growth management is required for climate-smart and sustainable crop production in response to climate change, with the heading stage being the most important. Research on the control of heading in rice (Oryza sativa) has mainly focused on day length and temperature; however, research on the effects of insolation is limited. Therefore, this study analyzed the differences in rice growth and heading responses under different light intensity and temperature conditions. Five early-maturing and seven medium-late-maturing rice varieties were used for each japonica heading ecology type. Our results showed that leaf age development, an indirect measure of rice phenological development, was inhibited under low light intensity and low-temperature conditions. Accordingly, the heading date was also delayed by approximately 18 days at low temperatures and 21 days at low light intensity, with no difference among ecotypes. We also found an interaction between temperature and light intensity, with the light intensity-mediated delay in heading date being affected more by high temperatures. This study demonstrated that light intensity and temperature have a major effect on heading date variation, suggesting that the impact of insolation must be considered for the accurate prediction of heading stage variation. These results could shed new light on rice phenology research and contribute to the implementation of precision agriculture.
为应对气候变化，实现气候智能型和可持续作物生产，需要精确的生长管理，其中抽穗期最为关键。水稻抽穗控制的研究主要集中在日长和温度方面；然而，关于日照影响的研究有限。因此，本研究分析了不同光照强度和温度条件下水稻生长和抽穗反应的差异。粳稻抽穗生态型各选用了5个早熟和7个中晚熟水稻品种。结果表明，在低光照强度和低温条件下，叶龄发育（水稻物候发育的间接指标）受到抑制。相应地，低温下抽穗期延迟约18天，低光照强度下延迟约21天，不同生态型之间无差异。我们还发现温度和光照强度之间存在相互作用，光照强度介导的抽穗期延迟受高温影响更大。本研究表明，光照强度和温度对抽穗期变化有重大影响，这表明在准确预测抽穗期变化时必须考虑日照的影响。这些结果可为水稻物候研究提供新的思路，并有助于精准农业的实施。
