Journal
PLANT CELL AND ENVIRONMENT
Volume 44, Issue 12, Pages 3623-3635Publisher
WILEY
DOI: 10.1111/pce.14183
Keywords
anisohydry; isohydry; nonstructural carbohydrates; stomatal control; thermal acclimation; tree; tree mortality
Categories
Funding
- Department of Energy, Office of Biological and Environmental Research
- Pacific Northwest National Laboratories LDRD program
- USDA National Institute of Food and Agriculture, McIntire Stennis [WNP00009]
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Short-term plant respiration increases exponentially with rising temperature, but drought could reduce respiration by reducing growth and metabolism. Differences in response to elevated temperature were related to substrate availability and stomatal response to leaf water potential, suggesting that species responses will be critical in ecosystem response to a warmer climate.
Short-term plant respiration (R) increases exponentially with rising temperature, but drought could reduce respiration by reducing growth and metabolism. Acclimation may alter these responses. We examined if species with different drought responses would differ in foliar R response to +4.8 degrees C temperature and -45% precipitation in a field experiment with mature pinon and juniper trees, and if any differences between species were related to differences in photosynthesis rates, shoot growth and nonstructural carbohydrates (NSCs). Short-term foliar R had a Q(10) of 1.6 for pinon and 2.6 for juniper. Pinon foliar R did not respond to the +4.8 degrees C temperatures, but R increased 1.4x for juniper. Across treatments, pinon foliage had higher growth, lower NSC content, 29% lower photosynthesis rates, and 44% lower R than juniper. Removing 45% precipitation had little impact on R for either species. Species differences in the response of R under elevated temperature were related to substrate availability and stomatal response to leaf water potential. Despite not acclimating to the higher temperature and having higher R than pinon, greater substrate availability in juniper suggests it could supply respiratory demand for much longer than pinon. Species responses will be critical in ecosystem response to a warmer climate.
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