An abscisic acid‐related reduced transpiration promotes gradual embolism repair when grapevines are rehydrated after drought
- 15 October 2008
- journal article
- Published by Wiley in New Phytologist
- Vol. 180 (3), 642-651
- https://doi.org/10.1111/j.1469-8137.2008.02592.x
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.Keywords
This publication has 47 references indexed in Scilit:
- Safety and efficiency conflicts in hydraulic architecture: scaling from tissues to treesPlant, Cell & Environment, 2007
- General relations of stomatal responses to xylem sap abscisic acid under stress in the rooting zone – A global perspectiveFlora, 2007
- Mercury hinders recovery of shoot hydraulic conductivity during grapevine rehydration: evidence from a whole‐plant approachNew Phytologist, 2006
- New evidence for a role of vessel‐associated cells and phloem in the rapid xylem refilling of cavitated stems of Laurus nobilis L.Plant, Cell & Environment, 2004
- Plasma Membrane Aquaporins Are Involved in Winter Embolism Recovery in Walnut TreePlant Physiology, 2003
- Dynamic changes in hydraulic conductivity in petioles of two savanna tree species: factors and mechanisms contributing to the refilling of embolized vesselsPlant, Cell & Environment, 2003
- Limits to xylem refilling under negative pressure in Laurus nobilis and Acer negundoPlant, Cell & Environment, 2003
- Water relations of coastal and estuarine Rhizophora mangle: xylem pressure potential and dynamics of embolism formation and repairOecologia, 2001
- Dynamic changes in petiole specific conductivity in red maple (Acer rubrum L.), tulip tree (Liriodendron tulipifera L.) and northern fox grape (Vitis labrusca L.)Plant, Cell & Environment, 2000
- Xylem recovery from cavitation‐induced embolism in young plants of Laurus nobilis: a possible mechanismNew Phytologist, 1996