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PMID: 18700860 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

An abscisic acid-related reduced transpiration promotes gradual embolism repair when grapevines are rehydrated after drought.

The New phytologist ·Vol. 180 ·No. 3 ·2008-00-00 ·Pages 642-651

Lovisolo C, Perrone I, Hartung W, Schubert A

Abstract

* Proposed mechanisms of embolism recovery are controversial for plants that are transpiring while undergoing cycles of dehydration and rehydration. * Here, water stress was imposed on grapevines (Vitis vinifera), and the course of embolism recovery, leaf water potential (Psi(leaf)), transpiration (E) and abscisic acid (ABA) concentration followed during the rehydration process. * As expected, Psi(leaf) and E decreased upon water stress, whereas xylem embolism and leaf ABA concentration increased. Upon rehydration, Psi(leaf) recovered in 5 h, whereas E fully recovered only after an additional 48 h. The ABA content of recovering leaves was higher than in droughted controls, both on the day of rewatering and the day after, suggesting that ABA accumulated in roots during drought was delivered to the rehydrated leaves. In recovering plants, xylem embolism in petioles, shoots, and roots decreased during the 24 h following rehydration. * A model is proposed to describe plant recovery after rehydration based on three main points: embolism repair occurs progressively in shoots and further in roots and in petioles, following an almost full recovery of Psi(leaf); hydraulic conductance recovers during diurnal transpiring hours, when formation and repair of embolisms occurs in all plant organs; an ABA residual signal in rehydrated leaves hinders stomatal opening even when water relations have recovered, suggesting that an ABA-induced transpiration control promotes gradual embolism repair in rehydrated grapevines.

MeSH Terms
Abscisic Acid/metabolism Adaptation, Physiological Biological Transport Dehydration Droughts Plant Stomata/physiology Plant Structures/physiology Plant Transpiration/physiology Signal Transduction Vitis/physiology Water/physiology Xylem/physiology
Chemicals
Water Abscisic Acid
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Lovisolo Claudio
Dipartimento Colture Arboree, Universita' di Torino, via Leonardo da Vinci 44, I-10095 Grugliasco, Italy.
Perrone Irene
Dipartimento Colture Arboree, Universita' di Torino, via Leonardo da Vinci 44, I-10095 Grugliasco, Italy.
Hartung Wolfram
Julius-von-Sachs Institut, Lehrstuhl Botanik I, Universität Würzburg, Julius-von-Sachs Platz 2, D-97082 Würzburg, Germany.
Schubert Andrea
Dipartimento Colture Arboree, Universita' di Torino, via Leonardo da Vinci 44, I-10095 Grugliasco, Italy.
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Article Info
Journal
The New phytologist
Abbr.
New Phytol
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2008.02592.x
Published
2008-00-00
Epub
2008-00-12
Pages
642-651
Language
English
Region
England
NLM ID
9882884
Subset
IM
External Links
PubMed source DOI: 10.1111/j.1469-8137.2008.02592.x View journal details
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