Stomata in early land plants and seed plants

Stomatal innovation and the rise of seed plants

by McAdam S. A. M., Brodribb, T. J. (2012)

in Ecol. Lett. 15: 1-8

(CrossRef, Medline).

Abstract

Stomatal valves on the leaves of vascular plants not only prevent desiccation but also dynamically regulate water loss to maintain efficient daytime water use. This latter process involves sophisticated active control of stomatal aperture that may be absent from early-branching plant clades.

To test this hypothesis, we compare the stomatal response to light intensity in 13 species of ferns and lycophytes with a diverse sample of seed plants to determine whether the capacity to optimise water use is an ancestral or derived feature of stomatal physiology.

We found that in seed plants, the ratio of photosynthesis to water use remained high and constant at different light intensities, but fern and lycophyte stomata were incapable of sustaining homeostatic water use efficiency. We conclude that efficient water use in early seed plants provided them with a competitive advantage that contributed to the decline of fern and lycophyte dominated-ecosystems in the late Paleozoic.

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Stomata of Pteridophytes

 

Research Group Pteridology

Ghent University

Modern pteridophyte research at Ghent University started with the investigation of stomata types by Van Cotthem.

Subsequent micromorphological studies produced contributions on indument characters and perispore traits in various families, as well as publications on taxonomic and floristic aspects.

Website: http://www.pteridology.ugent.be/

See: Ugent