Stomatal opening and closing delays

 

Effects of stomatal delays on the economics of leaf gas exchange under intermittent light regimes.

by Vico G., Manzoni S., Palmroth S., Katul G. (2011)

giulia
Giulia Vico, Swedish University of Agricultural Sciences
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Stefano Manzoni, University of Stockholm
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Sari Palmroth, Duke University, Durham
gabriel_katul
Gabriel Katul, Duke University, Durham

in New Phytol. 192, 640–652. doi: 10.1111/j.1469-8137.2011.03847.x –

PubMed Abstract | CrossRef Full Text | Google Scholar – 

http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2011.03847.x/full

Summary

  • Understory plants are subjected to highly intermittent light availability and their leaf gas exchanges are mediated by delayed responses of stomata and leaf biochemistry to light fluctuations. In this article, the patterns in stomatal delays across biomes and plant functional types were studied and their effects on leaf carbon gains and water losses were quantified.
  • A database of more than 60 published datasets on stomatal responses to light fluctuations was assembled. To interpret these experimental observations, a leaf gas exchange model was developed and coupled to a novel formulation of stomatal movement energetics. The model was used to test whether stomatal delays optimize light capture for photosynthesis, whilst limiting transpiration and carbon costs for stomatal movement.
  • The data analysis showed that stomatal opening and closing delays occurred over a limited range of values and were strongly correlated. Plant functional type and climate were the most important drivers of stomatal delays, with faster responses in graminoids and species from dry climates.
  • Although perfectly tracking stomata would maximize photosynthesis and minimize transpiration at the expense of large opening costs, the observed combinations of opening and closure times appeared to be consistent with a near-optimal balance of carbon gain, water loss and movement costs.
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Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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