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The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants
Published on: May 8, 2015
Higher daytime leaf temperatures contribute to lower freeze tolerance under elevated CO2
Beth R Loveys1, John J G Egerton, Marilyn C Ball
1CRC for Greenhouse Accounting and Ecosystem Dynamics Group, Research School of Biological Science, The Australian National University, GPO Box 475, Canberra ACT 2601, Australia. beth.loveys@anu.edu.au
Elevated atmospheric CO2 delays evergreen acclimation to freezing temperatures by increasing leaf temperature. This effect, similar to daytime warming, may reduce productivity gains in frost-prone regions.
Area of Science:
- Plant physiology
- Environmental science
- Climate change biology
Background:
- Elevated atmospheric CO2 (eCO2) negatively impacts evergreen freezing tolerance.
- The mechanisms behind eCO2's effect on freezing tolerance remain unclear.
- Stomatal conductance reduction under eCO2 leads to increased leaf temperature.
Purpose of the Study:
- To compare the effects of eCO2 and daytime warming on snow gum (Eucalyptus pauciflora) acclimation to freezing.
- To investigate the role of increased leaf temperature in mediating eCO2's impact on freezing tolerance.
Main Methods:
- Field experiments using open-top chambers (OTCs) for eCO2 and a Free Air Temperature Increase (FATI) system for daytime warming.
- Assessment of freeze tolerance through electrolyte leakage and photosynthetic efficiency measurements.
- Simulation of eCO2-induced leaf warming under ambient CO2 conditions using FATI.
Main Results:
- Both eCO2 and simulated daytime warming delayed acclimation to freezing temperatures by 2-3 weeks.
- After the initial delay, freeze tolerance in treated plants did not differ from controls.
- Increased daytime leaf temperature under eCO2 was identified as the likely cause for delayed acclimation.
Conclusions:
- Elevated CO2 delays the development of freezing tolerance in evergreens due to higher daytime leaf temperatures.
- Potential productivity increases from eCO2 and longer growing seasons may be offset by increased freezing stress in vulnerable areas.
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