Recent Advances in Plant Leaf Hydraulic Traits
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摘要: 叶片是水分传输的终端部分,水分在叶片中的传输效率限制了整个植株的水分传输,而叶片水力性状可以表征叶片水分传输方面的特征。目前针对叶片水力性状开展了较多研究并取得了一定的成果。文章在简述叶片水力性状测定指标、测定方法的基础上,阐明了影响叶片水力性状的因素、水力性状之间的权衡和协调关系以及与光合生理过程的响应关系;重点概述了气候变化背景下叶片水力性状的响应机制,并展望了今后的研究重点,以期为进一步了解植物碳水耦合关系提供参考。Abstract: Hydraulic characteristics of leaves can represent the features of leaf water transport since leaves are the terminal part of water transportation. Leaf water transport efficiency can constrain the whole plant's water transport. At present, many studies have been conducted on the leaf hydraulic traits of leaves and some results have been obtained. Based on a brief description of leaf hydraulic traits measurement indicators and methods, we discussed the factors affecting leaf hydraulic traits, trade-offs and coordination between hydraulic traits and their response to photosynthetic physiological processes. We focuses on the response mechanism of leaf hydraulic traits under the context of climate change. The future research is prospected, hoping to provide a reference to further understanding of the coupling relationship between carbon and water.
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Key words:
- plant leaves /
- hydraulic traits /
- stress response /
- photosynthetic physiology
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表 1 压力−容积曲线确定的水力性状
Table 1. Leaf hydraulic traits determined by pressure-volume curves
变量
Variables单位
Units描述
Description意义
SignificanceΨTLP MPa ΨP = 0,ΨW = ΨS时对应的点 ΨTLP值越负,植物越耐旱。 Cleaf mol·m−2·MPa−1 $\;\;\;{C}_{\text{leaf} } = \dfrac{\mathrm{\Delta }RWC}{\mathrm{\Delta }{\varPsi }_{1} } \times \left(\dfrac{DW}{LA}\right) \times \left(\dfrac{WW}{DW}\right)/{M}$ Cleaf值越大,植物越耐旱。 ε MPa $\varepsilon =\dfrac{\mathrm{\Delta }{\varPsi }_{\mathrm{P} } }{\mathrm{\Delta }RW{C} }$ 细胞壁刚度,ε值越大,植物越耐旱。 af % ΨW = −∞时的RWC 细胞外含水量,af值越大,植物越耐旱。 RWCTLP % ΨW = ΨTLP时的RWC 细胞开始萎蔫时的叶片相对含水量。RWCTLP值越大,植物越耐旱。 注:ΨP为压力势(MPa);ΨW为叶片水势(MPa);ΨS渗透势(MPa); ΔRWC/ΔΨl表示相对含水量(RWC)与水势的斜率;DW为叶片的干重(g);LA为叶片的面积(m2);WW为叶片的饱和重,即相对含水量为100%时的叶片重量(g);M为水的摩尔质量,即18 g/mol。ΨP is the pressure potential(MPa); ΨW is the leaf water potential(MPa); ΨS is the osmotic potential(MPa); ΔRWC/ΔΨl is the slope of the relative water content (RWC) and the water potential; DW is the dry weight of the leaf (g); LA is the area of the leaf (m2); WW is the saturated weight of the leaf, that is, the leaf weight (g) when the relative water content is 100%; M is the molar mass of water, that is, 18 g/mol. -
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