Laboratory of Botany, Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece.
Tree Physiol. 2009 Jul;29(7):889-900. doi: 10.1093/treephys/tpp032. Epub 2009 May 14.
The existence of an efficient but also safe hydraulic system seems to be essential for plant survival under water limiting conditions. To investigate any common pattern in this safety-efficiency trade-off, static (xylem anatomy and vulnerability to xylem cavitation) and dynamic (Kplant, soil to leaf hydraulic conductance and Psileaf, leaf water potential) hydraulic properties of nine Mediterranean species belonging to four functional groups (semi-deciduous malacophyllous, sclerophylls, deciduous and herbaceous) were studied across two altitude sites. Static parameters did not show any pattern, but a strong exponential relationship between Kplant and Psileaf was evident for all the studied species. Furthermore, each species is represented by a different part and/or range of the Kplant-Psileaf relationship, indicative of its adaptive mechanisms and capacity for survival under water stress conditions. The use of Kplant-Psileaf relationship as a tool for understanding the mechanisms of plant responses to water stress is discussed.
对于植物在限水条件下的生存而言，存在一个高效但安全的水力系统似乎是必不可少的。为了研究这种安全-效率权衡中的任何常见模式，对属于四个功能组（半落叶肉质叶、硬叶、落叶和草本）的 9 种地中海物种的静态（木质部解剖结构和木质部空穴脆弱性）和动态（Kplant，土壤到叶片水力传导率和 Psileaf，叶片水势）水力特性进行了研究，跨越了两个海拔地点。静态参数没有显示出任何模式，但对于所有研究的物种，Kplant 和 Psileaf 之间存在很强的指数关系。此外，每个物种都代表 Kplant-Psileaf 关系的不同部分和/或范围，表明其适应机制和在水分胁迫条件下生存的能力。讨论了将 Kplant-Psileaf 关系用作理解植物对水分胁迫响应机制的工具。
