A new look at water transport regulation in plants
A new look at water transport regulation in plants
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DOI：
10.1111/nph.12912
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发表时间：
2014-10-01
期刊：
影响因子：
9.4
通讯作者：
Mencuccini, Maurizio
中科院分区：
文献类型：
--
作者：
Martinez-Vilalta, Jordi;Poyatos, Rafael;Mencuccini, Maurizio
植物功能需要有效的机制来调节各种尺度的水分运输。在这里，我们开发了一个新的理论框架，描述植物对干燥土壤的反应，基于中午和黎明前叶水势之间的关系。关系的截距（λ）表征了每单位水力输送能力的最大蒸腾速率，而斜率（sigma）利用全球叶水势数据库估算了102种植物蒸腾速率和水分导度对水分有效性下降的敏感性，结果表明：我们对干旱反应的描述在物种内基本一致，并且参数λ和σ显示出与跨物种气候的有意义的关联。参数sigma为
Plant function requires effective mechanisms to regulate water transport at a variety of scales. Here, we develop a new theoretical framework describing plant responses to drying soil, based on the relationship between midday and predawn leaf water potentials. The intercept of the relationship (Lambda) characterizes the maximum transpiration rate per unit of hydraulic transport capacity, whereas the slope (sigma) measures the relative sensitivity of the transpiration rate and plant hydraulic conductance to declining water availability.This framework was applied to a newly compiled global database of leaf water potentials to estimate the values of Lambda and sigma for 102 plant species.Our results show that our characterization of drought responses is largely consistent within species, and that the parameters Lambda and sigma show meaningful associations with climate across species. Parameter sigma was