Sun Tao, Ruan Junmei, Cao Tiehua, Yao Li, Zhao Zichao, Zhang Jun, Li Jiarui, Deng Aixing, Chen Haotian, Gao Xinhao, Song Zhenwei
State Key Laboratory of Nutrient Use and Management/Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan, China.
Key Laboratory of Wastes Matrix Utilization, Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan, China.
Front Plant Sci. 2025 Mar 21;16:1484734. doi: 10.3389/fpls.2025.1484734. eCollection 2025.
In high-latitude area, climate change has brought about recurrent chilling stress that adversely impacts the sustainable production of rice and alters the distribution of carbon (C) and nitrogen (N) in paddy ecosystems. A comprehensive understanding of how the paddy ecosystem's C and N allocation responds to low-temperature stress during critical growth stages remains elusive.
A rice pot experiment of two varieties combined with C and N isotope labelling method was conducted to evaluate how low temperature stress at heading stage affects rice yield, and above- and belowground C and N partitioning.
Low-temperature stress significantly reduced rice grain yield of JN809 (sensitive to low-temperature stress) and J88 (tolerant to low-temperature stress) varieties by 27.6% and 21.4%, respectively, This stress tendency increased C and N accumulation in rice stems and leaves, while concurrently decreasing C and N accumulation in panicles. Specifically, under low-temperature stress, the C isotope content in stems and leaves was found to be 14.0% and 19.0% higher than in the control treatment, while the C and N isotope contents in their panicles were 29.3% and 22.5% lower, respectively. The low-temperature tolerant variety (J88) demonstrated a reduced effect of low-temperature stress on rice yield and C, N allocation due to efficient resource reallocation and stress tolerance mechanisms. The findings of this study provide a foundation for developing rice breeding and cultivation techniques that can enhance rice resilience and adaptability to climate change. Additionally, it informs strategies to optimize C and N sequestration practices in rice fields, ensuring high yields and efficient resource utilization.
在高纬度地区，气候变化带来了反复的低温胁迫，对水稻的可持续生产产生了不利影响，并改变了稻田生态系统中碳（C）和氮（N）的分布。对于稻田生态系统的碳氮分配在关键生长阶段如何响应低温胁迫，目前仍缺乏全面的了解。
进行了一个两个品种水稻的盆栽试验，并结合碳氮同位素标记法，以评估抽穗期低温胁迫如何影响水稻产量以及地上和地下的碳氮分配。
低温胁迫显著降低了对低温胁迫敏感的品种JN809和耐低温胁迫的品种J88的水稻籽粒产量，分别降低了27.6%和21.4%。这种胁迫趋势增加了水稻茎和叶中的碳氮积累，同时降低了穗中的碳氮积累。具体而言，在低温胁迫下，茎和叶中的碳同位素含量分别比对照处理高14.0%和19.0%，而穗中的碳氮同位素含量分别低29.3%和22.5%。耐低温品种（J88）由于有效的资源重新分配和胁迫耐受机制，低温胁迫对水稻产量和碳氮分配的影响较小。本研究结果为开发能够提高水稻对气候变化的恢复力和适应性的水稻育种和栽培技术提供了基础。此外，它还为优化稻田碳氮固存实践的策略提供了依据，确保高产和高效的资源利用。
