期刊
PLANT CELL AND ENVIRONMENT
卷 41, 期 8, 页码 1886-1894出版社
WILEY
DOI: 10.1111/pce.13327
关键词
cuticle; foliar water uptake; hydraulic resistance; leaf surface; rehydration kinetics
资金
- Katherine Esau
- Emilio Gonzalez Esparcia
Soil water transported via the petiole is a primary rehydration pathway for leaves of water-stressed plants. Leaves may also rehydrate by absorbing water via their epidermal surfaces. The mechanisms and physiological relevance of this water pathway, however, remain unclear, as the associated hydraulic properties are unknown. To gain insight into the foliar water absorption process, we compared rehydration kinetics via the petiole and surface of Prunus dulcis and Quercus lobata leaves. Petiole rehydration could be described by a double exponential function suggesting that 2 partly isolated water pools exist in leaves of both species. Surface rehydration could be described by a logistic function, suggesting that leaves behave as a single water pool. Whereas full leaf rehydration via the petiole required approximately 20min, it took over 150 and 300min via the surface of P.dulcis and Q.lobata, respectively. Such differences were attributed to the high resistance imposed by the leaf surface and especially the cuticle. The minimum resistance to surface rehydration was estimated to be 6.6x10(2) (P.dulcis) and 2.6x10(3)MPam(2)sg(-1) (Q.lobata), which is remarkably higher than estimated for petiole rehydration. These results are discussed in a physiological context.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据