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The apparent temperature response of leaf respiration depends on the timescale of measurements: a study of two cold climate species

Bruhn, D.; Schortemeyer, M.; Edwards, E. J.; Egerton, J. J. G.; Hocart, C. H.; Evans, J. R. and Ball, M. C. (2008). The apparent temperature response of leaf respiration depends on the timescale of measurements: a study of two cold climate species. Plant Biology, 10(2) pp. 185–193.

DOI (Digital Object Identifier) Link: https://doi.org/10.1111/j.1438-8677.2008.00031.x
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Abstract

Productivity and climate models often use a constant Q10 for plant respiration, assuming tight control of respiration by temperature. We studied the temperature response of leaf respiration of two cold climate species (the Australian tree Eucalyptus pauciflora and the subantarctic megaherb Pringlea antiscorbutica, both measured in a field setting) on a short timescale (minutes) during different times within a diel course, and on a longer timescale, using diel variations in ambient temperature. There were great variations in Q10 depending on measuring day, measuring time and measuring method. When Q10 was calculated from short-term (15 min) manipulations of leaf temperature, the resulting values were usually markedly smaller than when Q10 was calculated from measurements at ambient leaf temperatures spread over a day. While for E. pauciflora, Q10 estimates decreased with rising temperature (corroborating the concept of a temperature-dependent Q10), the opposite was the case for P. antiscorbutica. Clearly, factors other than temperature co-regulate both leaf respiration rates and temperature sensitivity and contribute to diel and seasonal variation of respiration.

Item Type: Journal Item
Copyright Holders: 2008 German Botanical Society and The Royal Botanical Society of the Netherlands
ISSN: 1438-8677
Keywords: acclimation; CO2 budget; diel respiration; seasonal respiration
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 38204
Depositing User: Astrid Peterkin
Date Deposited: 22 Aug 2013 10:42
Last Modified: 07 Dec 2018 10:18
URI: http://oro.open.ac.uk/id/eprint/38204
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