Open Access Repository

Amphistomatic leaf surfaces independently regulate gas exchange in response to variations in evaporative demand

Richardson, F, Brodribb, TJ ORCID: 0000-0002-4964-6107 and Jordan, GJ ORCID: 0000-0002-6033-2766 2017 , 'Amphistomatic leaf surfaces independently regulate gas exchange in response to variations in evaporative demand' , Tree Physiology, vol. 37, no. 7 , pp. 869-878 , doi: 10.1093/treephys/tpx073.

Full text not available from this repository.

Abstract

The occurrence of amphistomatic leaves (stomata on both surfaces) versus hypostomatic leaves (stomata limited to the lower or abaxial surface) has strong associations with environment. Amphistomy provides the advantage of higher conductance of CO2 for photosynthesis, however, unless the stomata on both leaf surfaces can be independently controlled in response to environmental cues, amphistomy may lead to inefficient gas exchange. While previous studies have found evidence that stomata can operate independently across and between surfaces of dorsiventral leaves, we investigate whether an independent stomatal response can be induced for isobilateral leaves by largely natural conditions. Here, we exposed surfaces of isobilateral, amphistomatic Eucalyptus globulus Labill. leaves to natural diurnal variation in differential evaporative demand, using leaf orientation to drive differences in irradiance and heat load on leaf surfaces. We identified preferential closure of stomata on the surface exposed to higher irradiation (and therefore evaporative demand) during the afternoon under natural conditions and similarly induced differential stomatal closure under experimental conditions in the laboratory. The differential response confirms that sufficient hydraulic isolation exists for independent stomatal response to occur between surfaces of amphistomatic, isobilateral leaves, and importantly, we show that natural conditions can induce surface-specific stomatal closure.

Item Type: Article
Authors/Creators:Richardson, F and Brodribb, TJ and Jordan, GJ
Keywords: amphistomatous, hypostomatous, stomatal ratio, vapour pressure deficit
Journal or Publication Title: Tree Physiology
Publisher: Heron Publishing
ISSN: 0829-318X
DOI / ID Number: 10.1093/treephys/tpx073
Copyright Information:

Copyright 2017 The Authors

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP