叶子热耐受性Hevea brasiliensis克隆:内部与克隆间的变化以及与其他功能特征的关系
Mohd Hafiz Mohd Hazir1,2, Emanuel Gloor1, Emma Docherty1
1School of Geography, Faculty of Environment, University of Leeds, Leeds LS2 9JT, UK.
Tree physiology
|February 13, 2024
概括
希维亚巴西的叶子耐热度 (T50) 在马来西亚克隆中和马来西亚克隆之间显示出最小的变化. 这一特征对于作物适应气候变化至关重要,表明树在该地区的热安全.
科学领域:
- 植物生理学 植物生理学
- 适应气候变化 适应气候变化
- 农业科学 农业科学
背景情况:
- 气候变化正在增加陆地表面温度和热浪,影响作物适应性.
- 了解植物的热极限对于预测未来气候场景下的作物表现至关重要.
- 树 (Hevea brasiliensis) 是一个面临潜在气候相关压力的经济重要作物.
研究的目的:
- 为了测量马来西亚Hevea brasiliensis克隆的叶子耐热性 (T50).
- 为了评估T50.50中的克隆间和克隆内变异.
- 为了研究T50和叶子/液压特征之间的关系.
主要方法:
- 测量T50,温度导致光系统II最大量子产量 (Fv/Fm) 降低50%.
- 分析了T50在9个马来西亚Hevea brasiliensis克隆中的变化.
- 与叶子特征相关的T50 (例如,每面积的叶子质量) 和液压特征 (例如,栓塞阻力).
主要成果:
- 观察到T50非常低的内克隆 (1.26% CV) 和内克隆 (2.1% CV) 变化.
- T50变化低于其他研究的功能特征.
- T50与每面积的叶子质量和干物质含量有负相关性,但与液压特征无关.
- 观察到的T50范围 (42.9-46.2°C) 显著超过了当前的最大空气温度.
结论:
- 在马来西亚克隆中,Hevea brasiliensis表现出高且一致的叶子耐热性.
- 这种物种在马来西亚似乎在热安全,T50远高于当前的最高温度.
- 在T50中最小的变化表明,在这个群体内,基于选择的适应热量的范围有限.
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