期刊
ANNALS OF BOTANY
卷 129, 期 5, 页码 555-566出版社
OXFORD UNIV PRESS
DOI: 10.1093/aob/mcac016
关键词
Climate change; computed tomography; cryo-scanning electron microscopy; drought; embolism formation; embolism repair; foliar absorption; foliar water uptake; microCT
资金
- Fund for Scientific Research-Flanders (FWO) through the PhD grant [V423619N]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- Hercules Foundation [AUGE-09-029]
Our study provides evidence of a hydraulic pathway from the leaf surface to the stem xylem following a water potential gradient, but this pathway only exists in functional vessels and does not contribute to embolism repair in beech.
Background and Aims Foliar water uptake has recently been suggested as a possible mechanism for the restoration of hydraulically dysfunctional xylem vessels. In this paper we used a combination of ecophysiological measurements, X-ray microcomputed tomography and cryo-scanning electron microscopy during a drought treatment to fully evaluate this hypothesis. Key Results Based on an assessment of these methods in beech (Fagus sylvatica L.) seedlings we were able to (1) confirm an increase in the amount of hydraulically redistributed water absorbed by leaves when the soil water potential decreased, and (2) locate this redistributed water in hydraulically active vessels in the stem. However, (3) no embolism repair was observed irrespective of the organ under investigation (i.e. stem, petiole or leaf) or the intensity of drought. Conclusions Our data provide evidence for a hydraulic pathway from the leaf surface to the stem xylem following a water potential gradient, but this pathway exists only in functional vessels and does not play a role in embolism repair for beech.
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