CO2 partial pressure and stomatal density

 

Photo credit: Google

Nardus stricta L. – matgrass

The responses of stomatal density to CO2 partial pressure.

by Woodward F.I., Bazzas F.  (1988)

in  J. Exp. Bot., 39: 1771-1781. -DOI: https://doi.org/10.1093/jxb/39.12.1771 –

Google Scholar CrossRef – 

https://academic.oup.com/jxb/article-abstract/39/12/1771/542607/The-Responses-of-Stomatal-Density-to-CO2-Partial?redirectedFrom=fulltext

Abstract

Experiments on a range of species of tree, shrub and herb have shown that stomatal density and stomatal index increase as the partial pressure of CO2 decreases over the range from the current level of 34 Pa to 22.5 Pa. Stomatal density responds to the reduced partial pressure of CO2 in a simulation of high altitude (3000 m), when the CO2 mole fraction is unchanged.

When the partial pressure of CO2 is increased from 35 to 70 Pa stomatal density decreases slightly, with a response to unit change in CO2 which is about 10% of that below 34 Pa.

Measurements of gas exchange on leaves which had developed in different CO2 partial pressures, but at low saturation vapour pressure deficits in the range of 0.7 to 0.9 kPa, indicated lower photosynthetic rates but higher stomatal conductances at reduced CO2partial pressures.

Experiments on populations of Nardus stricta originating from altitudes of 366 m and 810 m in Scotland, indicated genetic differences in the responses of stomatal density to CO2 in pressures simulating altitudes of sea level and 2 000 m.

Plants from the higher altitude showed greater declines in stomatal density when the CO2 partial pressure was increased.

Advertisements

Published by

Willem Van Cotthem

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

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s