Articles
IRRIGATION AND WATER RELATIONS INTERACTIONS IN GRAPEVINES
Article number
526_8
Pages
109 – 114
Language
Abstract
The interactions between irrigation and grapevine water relations was studied in three field experiments.
In all three experiments the effect of low and high soil moisture availability treatments on a few physiological parameters was studied.
Diurnal measurements of leaf and stem water potential and gas exchange parameters were performed in the mid-summer.
Stomatal conductance of non-irrigated Concord vines decreased with decreasing leaf water potential wereas that of continuously irrigated vines did not respond to decreasing leaf water potential.
This indicates that stomatal conductance is not affected by plant water status.
Stomatal conductance of Sauvignon blanc grapevines was highly correlated with leaf water potential though a higher correlation was apparent with stem water potential.
The insensitivity of the continuously irrigated vines to leaf water potential and the higher correlation of Sauvignon blanc leaf stomatal conductance with stem than with leaf water potential, were explained by root signals control of stomatal conductance.
Water use efficiency (assimilation rate/transpiration rate) of Sauvgnon blanc grapevines decreased with leaf water potential below a threshold of -1.7 MPa, indicating a reduction in the non stomatal condutance.
This reduction occurred at noontime and was found to be reversible.
In all three experiments the effect of low and high soil moisture availability treatments on a few physiological parameters was studied.
Diurnal measurements of leaf and stem water potential and gas exchange parameters were performed in the mid-summer.
Stomatal conductance of non-irrigated Concord vines decreased with decreasing leaf water potential wereas that of continuously irrigated vines did not respond to decreasing leaf water potential.
This indicates that stomatal conductance is not affected by plant water status.
Stomatal conductance of Sauvignon blanc grapevines was highly correlated with leaf water potential though a higher correlation was apparent with stem water potential.
The insensitivity of the continuously irrigated vines to leaf water potential and the higher correlation of Sauvignon blanc leaf stomatal conductance with stem than with leaf water potential, were explained by root signals control of stomatal conductance.
Water use efficiency (assimilation rate/transpiration rate) of Sauvgnon blanc grapevines decreased with leaf water potential below a threshold of -1.7 MPa, indicating a reduction in the non stomatal condutance.
This reduction occurred at noontime and was found to be reversible.
Authors
A. Naor, B. Bravdo
Keywords
Grapevine, stomatal conductance, assimilation rate, water relations
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