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
Abstract
• 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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Open access copy available from the journal web site. |
Keywords: | acclimation; biomass allocation; CO2; Plantago; photosynthesis; respiration; temperature |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (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 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:5052 |