Research progress in the effects of leaf hydraulic characteristics on plant physiological functions

doi:10.17521/cjpe.2015.0029

Abstract

Abstract:

Leaf is the main organ for plant photosynthesis, respiration, and transpiration. Earlier studies mainly focused on water transportation pathway in leaves, but leaf vein architecture and its ecological significance have been rarely studied. Recently, studies of leaf vein architecture, functions of stomatal structure, and leaf hydraulic characteristics have become major focuses of plant ecological research. This paper reviews the index of leaf vein architectural traits (i.e., vein density, diameter, and distance between veins), the influence of leaf hydraulic characteristic on plant functions such as growth, water transportation, gas exchange, and the relationship between leaf hydraulic conductance and drought adaptability for plants. Leaf vein architecture is the foundation of leaf physiological functions, and future studies should explore various types of relationships between plant leaf vein architectural traits and functional characteristics such as hydraulic conductance, photosynthesis, and respiration. Future research might also aim at development of stem-branch-leaf continuum model to explore ecophysiological mechanisms of plant functional structures and efficiency of water transportation, and to assess the adaptation of plants to the future climate scenarios.

Key words: leaf vein architecture, hydraulic conductance, drought adaptability, physiological function, physiological ecology mechanism

GONG Rong,GAO Qiong. Research progress in the effects of leaf hydraulic characteristics on plant physiological functions[J]. Chin J Plan Ecolo, 2015, 39(3): 300-308.

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https://www.plant-ecology.com/EN/Y2015/V39/I3/300

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References 76

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叶脉结构指标 Index of leaf vein structure	叶脉系统功能 Vein system function
叶脉直径 Vein diameter	机械支持 Mechanical support (+) 物质运输 Matter transport (+) 虫害防御 Defense of insect damage (+) 导水率 Hydraulic conductance (+) 栓塞脆弱性 Vulnerable to embolism (-)
叶脉密度 Vein density	物质运输 Matter transport (+) 机械支持 Mechanical support (+) 虫害防御 Defense of insect damage (+) 气孔密度 Stomatal density (+) 气孔导度 Stomatal conductance (+) 导水率 Hydraulic conductance (+) 气体交换速率 Rate of gas exchange (+) 抗旱能力 Tolerance of drought (+) 叶脉网络构建成本 Costs to venation networks (-)
叶脉闭合度 Loopiness of veins	导水路径 Water pathways (+) 虫害防御 Defense of insect damage (+)
叶脉间距 Distance between veins	物质运输 Matter transport (-) 碳、水通量 carbon and water fluxes (-)
叶脉分级 Vein hierarchy	次脉密度 Minor vein density (+) 叶脉网络构建成本 Costs to venation networks (+)

叶脉结构指标 Index of leaf vein structure	叶脉系统功能 Vein system function
叶脉直径 Vein diameter	机械支持 Mechanical support (+) 物质运输 Matter transport (+) 虫害防御 Defense of insect damage (+) 导水率 Hydraulic conductance (+) 栓塞脆弱性 Vulnerable to embolism (-)
叶脉密度 Vein density	物质运输 Matter transport (+) 机械支持 Mechanical support (+) 虫害防御 Defense of insect damage (+) 气孔密度 Stomatal density (+) 气孔导度 Stomatal conductance (+) 导水率 Hydraulic conductance (+) 气体交换速率 Rate of gas exchange (+) 抗旱能力 Tolerance of drought (+) 叶脉网络构建成本 Costs to venation networks (-)
叶脉闭合度 Loopiness of veins	导水路径 Water pathways (+) 虫害防御 Defense of insect damage (+)
叶脉间距 Distance between veins	物质运输 Matter transport (-) 碳、水通量 carbon and water fluxes (-)
叶脉分级 Vein hierarchy	次脉密度 Minor vein density (+) 叶脉网络构建成本 Costs to venation networks (+)

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