Global CO 2 rise leads to reduced maximum stomatal conductance in Florida vegetation
Open Access
- 17 February 2011
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 108 (10), 4035-4040
- https://doi.org/10.1073/pnas.1100371108
Abstract
A principle response of C3 plants to increasing concentrations of atmospheric CO2 (CO2) is to reduce transpirational water loss by decreasing stomatal conductance (gs) and simultaneously increase assimilation rates. Via this adaptation, vegetation has the ability to alter hydrology and climate. Therefore, it is important to determine the adaptation of vegetation to the expected anthropogenic rise in CO2. Short-term stomatal opening–closing responses of vegetation to increasing CO2 are described by free-air carbon enrichments growth experiments, and evolutionary adaptations are known from the geological record. However, to date the effects of decadal to centennial CO2 perturbations on stomatal conductance are still largely unknown. Here we reconstruct a 34% (±12%) reduction in maximum stomatal conductance (gsmax) per 100 ppm CO2 increase as a result of the adaptation in stomatal density (D) and pore size at maximal stomatal opening (amax) of nine common species from Florida over the past 150 y. The species-specific gsmax values are determined by different evolutionary development, whereby the angiosperms sampled generally have numerous small stomata and high gsmax, and the conifers and fern have few large stomata and lower gsmax. Although angiosperms and conifers use different D and amax adaptation strategies, our data show a coherent response in gsmax to CO2 rise of the past century. Understanding these adaptations of C3 plants to rising CO2 after decadal to centennial environmental changes is essential for quantification of plant physiological forcing at timescales relevant for global warming, and they are likely to continue until the limits of their phenotypic plasticity are reached.Keywords
This publication has 44 references indexed in Scilit:
- Climate forcing due to optimization of maximal leaf conductance in subtropical vegetation under rising CO 2Proceedings of the National Academy of Sciences of the United States of America, 2011
- Importance of carbon dioxide physiological forcing to future climate changeProceedings of the National Academy of Sciences, 2010
- A stomatal optimization theory to describe the effects of atmospheric CO2 on leaf photosynthesis and transpirationAnnals of Botany, 2009
- Maximum leaf conductance driven by CO 2 effects on stomatal size and density over geologic timeProceedings of the National Academy of Sciences, 2009
- The response of photosynthesis and stomatal conductance to rising [CO2]: mechanisms and environmental interactionsPlant, Cell & Environment, 2007
- Selection pressures on stomatal evolutionNew Phytologist, 2002
- Long‐distance CO2 signalling in plantsJournal of Experimental Botany, 2002
- The Effect of Exogenous Abscisic Acid on Stomatal Development, Stomatal Mechanics, and Leaf Gas Exchange inTradescantia virginianaPlant Physiology, 2001
- Oak leaves as biosensors of late neogene and early pleistocene paleoatmospheric CO2 concentrationsMarine Micropaleontology, 1996
- Maintenance of constant leaf temperature by plants—II. Experimental observations in cottonEnvironmental and Experimental Botany, 1988