Articles
IMPACT OF THERMAL STRESS AND HIGH VPD ON GAS EXCHANGE AND CHLOROPHYLL FLUORESCENCE OF CITRUS GRANDIS UNDER DESERT CONDITIONS
Article number
531_20
Pages
143 – 150
Language
Abstract
The photosynthetic response of Citrus grandis to high light intensities, low air humidity and high temperature stress was investigated under desert conditions in the southern Arava Valley (Israel). During summer, a typical midday stomatal closure was observed even in well-watered trees due to the dramatic increase of the leaf-to-air water vapour deficit.
As a result of the reduced transpirational cooling, leaf temperatures increased up to 11°C above ambient air temperature.
The combination of heat stress and photoinhibition resulted in a reversible decrease of photosynthetic activity of Citrus grandis under the extreme summer conditions.
As a result of the reduced transpirational cooling, leaf temperatures increased up to 11°C above ambient air temperature.
The combination of heat stress and photoinhibition resulted in a reversible decrease of photosynthetic activity of Citrus grandis under the extreme summer conditions.
Authors
M. Veste, A. Ben-Gal, U. Shani
Keywords
heat stress, photoinhibition, photosynthesis, temperature
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