Salinity effects on the stomatal behaviour of grapevine

An investigation of the time-course of inhibition of photosynthesis in salt-stressed grapevine (Vitis vinifera L.) leaves revealed two types of stomatal behaviour. Up to tissue concentrations of 165 mM chloride the inhibition was due to a uniform decrease in stomatal conductance, as indicated from a...

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Bibliographic Details
Published in:The New phytologist 1990-11, Vol.116 (3), p.499-503
Main Authors: Downtown, W.J.S, Loveys, B.R, Grant, W.J.R
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
autoradiography
Biological and medical sciences
Carbon dioxide
chemical composition
Chloride
Chlorides
Dehydration
Fundamental and applied biological sciences. Psychology
gas exchange
inhibition
intercellular partial pressure of co2
leaf conductance
Leaves
Photosynthesis
Plant physiology
Plant physiology and development
Plants
Salinity
salt stress
Stomata
Stomatal conductance
stress response
Vitis vinifera
Water and solutes. Absorption, translocation and permeability
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Summary:An investigation of the time-course of inhibition of photosynthesis in salt-stressed grapevine (Vitis vinifera L.) leaves revealed two types of stomatal behaviour. Up to tissue concentrations of 165 mM chloride the inhibition was due to a uniform decrease in stomatal conductance, as indicated from autoradiograms of14CO2fixation and no change in the relationship of assimilation to calculated intercellular partial pressure of CO2(A-Ci) compared with control plants. The occurrence of non-stomatal inhibition of photosynthesis at higher levels of leaf chloride, suggested by a decline in the slope of the calculated A-Cirelationship, was associated with non-uniform14CO2uptake over the leaf surface similar to that previously observed for ABA-treated and water-stressed grapevine leaves where non-stomatal inhibition of photosynthesis was shown to be an artifact arising from non-uniform stomatal behaviour. These observations also provide an explanation for the stimulation of photorespiration during salt stress.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1990.tb00535.x