Stomata ABA content and other stress‐related physiological parameters

 

Relationship between changes in the guard cell abscisic-acid content and other stress-related physiological parameters in intact plants.

by Zhang S. Q.Outlaw Jr. W. H.Aghoram K. (2001)

 

in J. Exp. Bot. 52, 301308 (2001). doi:10.1093/jexbot/52.355.301- pmid:11283175 – 

Google Scholar – 

https://academic.oup.com/jxb/article/52/355/301/558349/Relationship-between-changes-in-the-guard-cell

Abstract

The relationships of guard cell ABA content to eight stress‐related physiological parameters were determined on intact Vicia faba L. plants that were grown hydroponically with split‐root systems.

Continuous stress was imposed by the addition of PEG to part of the root system. The water potentials of roots sampled after the addition of PEG were 0.25 MPa lower than the water potentials of other roots of the same plant, which were similar to the roots of untreated plants.

The leaflet water potentials of plants sampled within 2 h of stress imposition were similar to those of control plants. However, leaf conductance was lower in plants sampled after only 20 min of stress imposition, and the root‐ and leaflet apoplastic ABA concentrations of these plants were higher than those of untreated plants.

As the essence of this report, there was a linear relationship between guard cell ABA content and leaf conductance. Leaflet apoplastic ABA concentrations <150 nM were also linearly related to leaf conductance, but higher leaflet apoplastic ABA concentration did not cause equally large further declines in leaf conductance.

It is suggested that evaporation from guard cell walls caused ABA to accumulate in the guard cell apoplast and this pool was saturated at high leaflet apoplastic ABA concentrations.

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