Effects of stomatal delays on the economics of leaf gas exchange under intermittent light regimes
Article first published online: 18 AUG 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 192, Issue 3, pages 640–652, November 2011
How to Cite
Vico, G., Manzoni, S., Palmroth, S. and Katul, G. (2011), Effects of stomatal delays on the economics of leaf gas exchange under intermittent light regimes. New Phytologist, 192: 640–652. doi: 10.1111/j.1469-8137.2011.03847.x
- Issue published online: 19 OCT 2011
- Article first published online: 18 AUG 2011
- Received: 13 April 2011, Accepted: 5 July 2011
- intermittent light;
- leaf economics;
- stomatal conductance;
- •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.