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Respiration as a percentage of daily photosynthesis in whole plants is homeostatic at moderate, but not high, growth temperatures

Atkin, O.K., Scheurwater, I. and Pons, T.L. (2007) Respiration as a percentage of daily photosynthesis in whole plants is homeostatic at moderate, but not high, growth temperatures. New Phytologist, 174 (2). pp. 367-380. ISSN 0028-646X

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• Here, we investigated the impact of temperature on the carbon economy of two Plantago species from contrasting habitats.

• The lowland Plantago major and the alpine Plantago euryphylla were grown hydroponically at three constant temperatures: 13, 20 and 27°C. Rates of photosynthetic CO2 uptake (P) and respiratory CO2 release (R) in shoots and R in roots were measured at the growth temperature using intact plants. At each growth temperature, air temperatures were changed to establish short-term temperature effects on the ratio of R to P (R/P).

• In both species, R/P was essentially constant in plants grown at 13 and 20°C. However, R/P was substantially greater in 27°C-grown plants, particularly in P. euryphylla. The increase in R/P at 27°C would have been even greater had biomass allocation to roots not decreased with increasing growth temperature. Short-term increases in air temperature increased R/P in both species, with the effects of air temperature being most pronounced in 13°C-grown plants.

• We conclude that temperature-mediated changes in biomass allocation play an important role in determining whole-plant R/P values, and, while homeostasis of R/P is achieved across moderate growth temperatures, homeostasis is not maintained when plants are exposed to growth temperatures higher than usually experienced in the natural habitat.

Item Type: Article
Copyright, Publisher and Additional Information: Open access copy available from the journal web site.
Keywords: acclimation; biomass allocation; CO2; Plantago; photosynthesis; respiration; temperature
Institution: The University of York
Academic Units: The University of York > Biology (York)
Depositing User: Open Access From Journal
Date Deposited: 23 Dec 2008 13:47
Last Modified: 23 Dec 2008 13:47
Published Version: http://dx.doi.org/10.1111/j.1469-8137.2007.02011.x
Status: Published
Publisher: Wiley-Blackwell
Refereed: Yes
Identification Number: 10.1111/j.1469-8137.2007.02011.x
URI: http://eprints.whiterose.ac.uk/id/eprint/5052

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