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

Respiration as a percentage of daily photosynthesis in whole plants is homeostatic at moderate,... • 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png New Phytologist Wiley

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

Atkin, O. K.; Scheurwater, I.; Pons, T. L.
New Phytologist , Volume 174 (2) – Apr 1, 2007
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References (71)

Publisher
Wiley
Copyright
Copyright © 2007 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0028-646X
eISSN
1469-8137
DOI
10.1111/j.1469-8137.2007.02011.x
pmid
17388899
Publisher site
See Article on Publisher Site

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.

Journal

New Phytologist – Wiley

Published: Apr 1, 2007

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