Journal
FRONTIERS IN PLANT SCIENCE
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2019.00609
Keywords
elevated CO2; gas exchange; global climate change; stomatal conductance regulation; tropical forage legume; warming
Categories
Funding
- Sao Paulo Research Foundation (FAPESP) [2008/58075-8]
- Brazilian National Council for Scientific and Technological Development (CNPq) [446357/2015-4]
- CNPq [385485/2015-8, 306039/2016-8]
- CNPq
- FAPESP [14/26821-3, 16/09742-8, 14/00317-7]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [14/26821-3, 16/09742-8, 08/58075-8] Funding Source: FAPESP
Ask authors/readers for more resources
The opening and closing of stomata are controlled by the integration of environmental and endogenous signals. Here, we show the effects of combining elevated atmospheric carbon dioxide concentration (eCO(2); 600 mu mol mol(-1)) and warming (+2 degrees C) on stomatal properties and their consequence to plant function in a Stylosanthes capitata Vogel (C-3) tropical pasture. The eCO(2) treatment alone reduced stomatal density, stomatal index, and stomatal conductance (g(s)), resulting in reduced transpiration, increased leaf temperature, and leading to maintenance of soil moisture during the growing season. Increased CO2 concentration inside leaves stimulated photosynthesis, starch content levels, water use efficiency, and PSII photochemistry. Under warming, plants developed leaves with smaller stomata on both leaf surfaces; however, we did not see effects of warming on stomatal conductance, transpiration, or leaf water status. Warming alone enhanced PSII photochemistry and photosynthesis, and likely starch exports from chloroplasts. Under the combination of warming and eCO(2), leaf temperature was higher than that of leaves from the warming or eCO(2) treatments. Thus, warming counterbalanced the effects of CO2 on transpiration and soil water content but not on stomatal functioning, which was independent of temperature treatment. Under warming, and in combination with eCO(2), leaves also produced more carotenoids and a more efficient heat and fluorescence dissipation. Our combined results suggest that control on stomatal opening under eCO(2) was not changed by a warmer environment; however, their combination significantly improved whole-plant functioning.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available