Leaf carbon and water status control stomatal and nonstomatal limitations of photosynthesis in trees
- 18 January 2020
- journal article
- research article
- Published by Wiley in New Phytologist
- Vol. 226 (3), 690-703
- https://doi.org/10.1111/nph.16436
Abstract
Photosynthetic rate is concurrently limited by stomatal limitations and nonstomatal limitations (NSLs). However, the controls on NSLs to photosynthesis and their coordination with stomatal control on different timescales remain poorly understood. According to a recent optimization hypothesis, NSLs depend on leaf osmotic or water status and are coordinated with stomatal control so as to maximize leaf photosynthesis. Drought and notching experiments were conducted on Pinus sylvestris, Picea abies, Betula Pendula and Populus tremula seedlings in glasshouse conditions to study the dependence of NSLs on leaf osmotic and water status, and their coordination with stomatal control, on timescales of minutes and weeks, to test the assumptions and predictions of the optimization hypothesis. Both NSLs and stomatal conductance followed power‐law functions of leaf osmotic concentration and leaf water potential. Moreover, stomatal conductance was proportional to the square root of soil‐to‐leaf hydraulic conductance, as predicted by the optimization hypothesis. Though the detailed mechanisms underlying the dependence of NSLs on leaf osmotic or water status lie outside the scope of this study, our results support the hypothesis that NSLs and stomatal control are coordinated to maximize leaf photosynthesis and allow the effect of NSLs to be included in models of tree gas‐exchange.Keywords
Funding Information
- Academy of Finland (312571, 282842, 310375, 307331, 324014, 323843)
This publication has 71 references indexed in Scilit:
- Hexokinase mediates stomatal closureThe Plant Journal, 2013
- Hexose Kinases and Their Role in Sugar-Sensing and Plant DevelopmentFrontiers in Plant Science, 2013
- Silicon nutrition increases grain yield, which, in turn, exerts a feed‐forward stimulation of photosynthetic rates via enhanced mesophyll conductance and alters primary metabolism in riceNew Phytologist, 2012
- The Role of Phloem Loading ReconsideredPlant Physiology, 2010
- Changes in gas exchange versus leaf solutes as a means to cope with summer drought in Eucalyptus marginataOecologia, 2007
- Inhibition of photosynthesis by heat stress: the activation state of Rubisco as a limiting factor in photosynthesisPhysiologia Plantarum, 2004
- Unraveling the Effects of Plant Hydraulics on Stomatal Closure during Water Stress in WalnutPlant Physiology, 2002
- Carbohydrate metabolism in a heat‐girdled maize source leafPlant, Cell & Environment, 2000
- Stomatal and nonstomatal limitations of photosynthesis in relation to the drought and shade tolerance of tree species in open and understory environmentsTrees, 1996
- The Effect of Reduced Hydraulic Conductance on Stomatal Conductance and Xylem CavitationJournal of Experimental Botany, 1993