The Impact of Heat Stress and Water Deficit on the Photosynthetic and Stomatal Physiology of Olive ( Olea europaea L.)-A Case Study of the 2017 Heat Wave

Heat waves are predicted to increase in frequency and duration in many regions as global temperatures rise. These transient increases in temperature above normal average values will have pronounced impacts upon the photosynthetic and stomatal physiology of plants. During the summer of 2017, much of...

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Bibliographic Details
Published in:Plants (Basel) 2018-09, Vol.7 (4), p.76
Main Authors: Haworth, Matthew, Marino, Giovanni, Brunetti, Cecilia, Killi, Dilek, De Carlo, Anna, Centritto, Mauro
Format: Article
Language:English
Subjects:
Carbon
case studies
Chlorophyll
Drought
Efficiency
Energy
Fluorescence
Gas exchange
Global temperatures
Heat
Heat exchange
Heat stress
Heat tolerance
Heat waves
High temperature
Irrigation
irrigation rates
Irrigation water
Italy
leaves
Mediterranean agriculture
OJIP
Olea europaea
Olives
Oxidative stress
Oxygenase
Photochemistry
Photosynthesis
Photosystem II
Physiology
Ribulose-1,5-bisphosphate
Ribulose-bisphosphate carboxylase
Stomata
Stomatal conductance
summer
Sustainable agriculture
temperature
Vegetation
Water deficit
water use efficiency
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Summary:Heat waves are predicted to increase in frequency and duration in many regions as global temperatures rise. These transient increases in temperature above normal average values will have pronounced impacts upon the photosynthetic and stomatal physiology of plants. During the summer of 2017, much of the Mediterranean experienced a severe heat wave. Here, we report photosynthetic leaf gas exchange and chlorophyll fluorescence parameters of olive ( cv. Leccino) grown under water deficit and full irrigation over the course of the heat wave as midday temperatures rose over 40 °C in Central Italy. Heat stress induced a decline in the photosynthetic capacity of the olives consistent with reduced ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO) activity. Damage to photosystem II was more apparent in plants subject to water deficit. In contrast to previous studies, higher temperatures induced reductions in stomatal conductance. Heat stress adversely affected the carbon efficiency of olive. The selection of olive varieties with enhanced tolerance to heat stress and/or strategies to mitigate the impact of higher temperatures will become increasingly important in developing sustainable agriculture in the Mediterranean as global temperatures rise.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants7040076