热和臭氧压力对大米生长和生产力的影响:互动和缓解效应
Hyeon-Seok Lee1, So-Hye Jo1, Ju-Hee Kim1
1Crop Production & Physiology Division, National Institute of Crop Science, Rural Development Administration, Wanju-Gun 55365, Republic of Korea.
The Science of the total environment
|April 30, 2025
概括
气温上升和臭氧 (O3) 压力影响米产量. 有趣的是,暴露于臭氧可能通过改变生理反应来部分减轻热引起的产量损失,为气候适应性大米提供目标.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 植物生理学 植物生理学
背景情况:
- 全球变暖增加了表面臭氧 (O3) 和热应激,给作物生产带来了风险.
- 热量和O3对大米 (Oryza sativa L.) 生理学和产量的综合影响尚不清楚.
研究的目的:
- 为了研究大米对高温和O3压力的生理和产量反应.
- 为了确定特定阶段的敏感性和的压力反应的潜在机制.
主要方法:
- 在自然条件下使用温度梯度场腔系统两年.
- 进行了受控的生长室实验,以评估特定阶段的反应.
- 测量的生理参数和谷物产量.
主要成果:
- 升高的温度显著降低了大米谷物产量,在+3.0°C时损失大于+1.5°C.
- 单单增加的O3导致产量减少8.1%,但在+3.0°C的联合压力下不会加剧产量损失.
- 臭氧暴露部分减轻了因热引起的产量损失,通过提高酸盐水平和恢复光合作用效率.
结论:
- 在大米中热量和O3压力之间存在复杂的相互作用,O3有可能减轻热损伤.
- 压力影响因发育阶段而异,半球变化对头部最为敏感.
- 已识别的生理和分子反应为培育适应气候变化的米品种提供了目标.
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