Intraspecific variability of ecophysiological traits of four Magnoliaceae species growing in two climatic regions in China
Intraspecific variability of ecophysiological traits of four Magnoliaceae species growing in two climatic regions in China
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中国两个气候区四种木兰科植物生态生理性状的种内变异
DOI：
10.1007/s11258-017-0699-9
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发表时间：
2017-01
期刊：
影响因子：
1.7
通讯作者：
Ye Q.
中科院分区：
文献类型：
--
作者：
Xu Q. Y.;Liu H.;Ye Q.
植物可能会改变其生态生理特征以适应新环境，但其反应很大程度上取决于物种和环境条件。木兰科物种具有重要的科学意义，但又极度濒危，因此，研究其生态生理适应对于原地保护至关重要。在这里，我们选择了生长在南亚热带季风区和北亚热带季风区两个植物园的四种常见木兰科物种，并测量了雨季和旱季的水力和光合特性。我们发现，北方地区植物在黎明前和中午的叶片水势显着低于南方地区，表明北方地区物种遭受更严重的干旱胁迫。因此，北方地区的物种气孔导度和光合速率较低，气孔指数也较小。此外，与南方地区的物种相比，北部地区的两种落叶树种的茎导水率显着降低，而两个地区的两种常绿树种的茎导水率值相似。比较南北地区的物种时，发现叶片膨压损失点、叶片导度、比叶面积和木材密度没有显着差异。我们的结果表明，植物水力学对木兰科物种当地气候条件的调整主要通过气孔形态和功能的变化发生，而叶片水力性状的种内变异的贡献似乎有限。
Plants may change their ecophysiological traits to adapt to new environments, but the responses strongly depend on species and environmental conditions. Magnoliaceae species are of great scientific importance but are extremely endangered, therefore, it is crucial to study their ecophysiological adaptations forex situconservation. Here, we chose four common Magnoliaceae species growing in two botanical gardens located in south and north subtropical monsoon regions, and measured hydraulic and photosynthetic traits in both wet and dry seasons. We found that plants growing in north region showed significant lower leaf water potential at predawn and midday than those in south region, indicating that species suffered more severe drought stress in north region. As a result, species in north region had lower stomatal conductance and photosynthetic rates, as well as smaller stomatal pore index. In addition, significantly lower stem hydraulic conductivity of the two deciduous species in north region were observed compared with species in south region, while the two evergreen species at both regions showed similar values of stem hydraulic conductivity. Non-significant differences in leaf turgor loss points, leaf conductance, specific leaf area, and wood density were found when comparing species from the north and south regions. Our results suggested that the adjustment of plant hydraulics to local climatic conditions of Magnoliaceae species occurs primarily through changes in stomatal morphology and function, whereas the contribution of intraspecific variation in leaf hydraulic traits appears to be limited.
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影响因子：
3
作者：
Nardini, A;Gortan, E;Salleo, S
通讯作者：
Salleo, S
影响因子：
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通讯作者：
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