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Leaf stomatal responses to vapour pressure deficit under current and CO(2)-enriched atmosphere explained by the economics of gas exchange.

Publication ,  Journal Article
Katul, GG; Palmroth, S; Oren, R
Published in: Plant, cell & environment
August 2009

Using the economics of gas exchange, early studies derived an expression of stomatal conductance (g) assuming that water cost per unit carbon is constant as the daily loss of water in transpiration (f(e)) is minimized for a given gain in photosynthesis (f(c)). Other studies reached identical results, yet assumed different forms for the underlying functions and defined the daily cost parameter as carbon cost per unit water. We demonstrated that the solution can be recovered when optimization is formulated at time scales commensurate with the response time of g to environmental stimuli. The optimization theory produced three emergent gas exchange responses that are consistent with observed behaviour: (1) the sensitivity of g to vapour pressure deficit (D) is similar to that obtained from a previous synthesis of more than 40 species showing g to scale as 1 - m log(D), where m is in [0.5,0.6], (2) the theory is consistent with the onset of an apparent 'feed-forward' mechanism in g, and (3) the emergent non-linear relationship between the ratio of intercellular to atmospheric [CO(2)] (c(i)/c(a)) and D agrees with the results available on this response. We extended the theory to diagnosing experimental results on the sensitivity of g to D under varying c(a).

Duke Scholars

Published In

Plant, cell & environment

DOI

EISSN

1365-3040

ISSN

0140-7791

Publication Date

August 2009

Volume

32

Issue

8

Start / End Page

968 / 979

Related Subject Headings

  • Vapor Pressure
  • Plant Transpiration
  • Plant Stomata
  • Plant Biology & Botany
  • Models, Theoretical
  • Carbon Dioxide
  • 3108 Plant biology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences
 

Citation

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Katul, G. G., Palmroth, S., & Oren, R. (2009). Leaf stomatal responses to vapour pressure deficit under current and CO(2)-enriched atmosphere explained by the economics of gas exchange. Plant, Cell & Environment, 32(8), 968–979. https://doi.org/10.1111/j.1365-3040.2009.01977.x
Katul, Gabriel G., Sari Palmroth, and Ram Oren. “Leaf stomatal responses to vapour pressure deficit under current and CO(2)-enriched atmosphere explained by the economics of gas exchange.Plant, Cell & Environment 32, no. 8 (August 2009): 968–79. https://doi.org/10.1111/j.1365-3040.2009.01977.x.
Katul, Gabriel G., et al. “Leaf stomatal responses to vapour pressure deficit under current and CO(2)-enriched atmosphere explained by the economics of gas exchange.Plant, Cell & Environment, vol. 32, no. 8, Aug. 2009, pp. 968–79. Epmc, doi:10.1111/j.1365-3040.2009.01977.x.
Journal cover image

Published In

Plant, cell & environment

DOI

EISSN

1365-3040

ISSN

0140-7791

Publication Date

August 2009

Volume

32

Issue

8

Start / End Page

968 / 979

Related Subject Headings

  • Vapor Pressure
  • Plant Transpiration
  • Plant Stomata
  • Plant Biology & Botany
  • Models, Theoretical
  • Carbon Dioxide
  • 3108 Plant biology
  • 07 Agricultural and Veterinary Sciences
  • 06 Biological Sciences