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Impact of temperature on the relationship between respiration and nitrogen concentration in roots: an analysis of scaling relationships, Q(10) values and thermal acclimation ratios

Atkinson, L.J., Hellicar, M.A., Fitter, A.H. and Atkin, O.K. (2007) Impact of temperature on the relationship between respiration and nitrogen concentration in roots: an analysis of scaling relationships, Q(10) values and thermal acclimation ratios. New Phytologist, 173 (1). pp. 110-120. ISSN 0028-646X

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Abstract

• The impact of nitrogen (N) supply on the temperature response of root respiratory O2 uptake (R) was assessed in several herbaceous species grown in solution culture. Warm-grown (25 : 20°C, day:night) plants differing in root N concentration were shifted to 13 : 8°C for 7 d to cold-acclimate.

• Log–log plots of root R vs root N concentration both showed that R increased with increasing tissue N concentration, irrespective of the growth temperature. Although the regression slopes of the log–log plots did not differ between the warm-grown and cold-acclimated plants, cold-acclimated plants did exhibit a higher y-axis intercept than their warm-grown counterparts. This suggests that cold acclimation of root R is not entirely dependent on cold-induced increases in tissue N concentration and that scaling relationships (i.e. regression equations fitted to the log–log plots) between root R and N concentration are not fixed.

• No systematic differences were found in the short-term Q10 (proportional change in R per 10°C change in temperature), or degree of cold acclimation (as measured by the proportional difference between warm- and cold-acclimated roots) among roots differing in root N concentration. The temperature response of root R is therefore insensitive to tissue N concentration.

• The insensitivity of Q10 values and acclimation to tissue N concentration raises the possibility that root R and its temperature sensitivity can be predicted for a range of N supply scenarios.

Item Type: Article
Copyright, Publisher and Additional Information: Open access copy available from the journal web site.
Keywords: acclimation; nitrogen, Q(10), root respiration, scaling relationships, temperature
Academic Units: The University of York > Biology (York)
Depositing User: Open Access From Journal
Date Deposited: 23 Dec 2008 12:34
Last Modified: 23 Dec 2008 12:34
Published Version: http://dx.doi.org/10.1111/j.1469-8137.2006.01891.x
Status: Published
Publisher: Wiley-Blackwell
Refereed: Yes
Identification Number: 10.1111/j.1469-8137.2006.01891.x
URI: http://eprints.whiterose.ac.uk/id/eprint/5056

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