Adaxial/abaxial specification in the regulation of photosynthesis and stomatal opening with respect to light orientation and growth with CO2 enrichment in the C4 species Paspalum dilatatum

A - Papers appearing in refereed journals

Soares, A. S., Driscoll, S. P., Olmos, E., Harbinson, J., Arrabaca, M. C. and Foyer, C. H. 2008. Adaxial/abaxial specification in the regulation of photosynthesis and stomatal opening with respect to light orientation and growth with CO2 enrichment in the C4 species Paspalum dilatatum. New Phytologist. 177 (1), pp. 186-198.

AuthorsSoares, A. S., Driscoll, S. P., Olmos, E., Harbinson, J., Arrabaca, M. C. and Foyer, C. H.
Abstract

Whole-plant morphology, leaf structure and composition were studied together with the effects of light orientation on the dorso-ventral regulation of photosynthesis and stomatal conductance in Paspalum dilatatum cv. Raki plants grown for 6 wk at either 350 or 700 mu l l(-1) CO2. Plant biomass was doubled as a result of growth at high CO2 and the shoot:root ratio was decreased. Stomatal density was increased in the leaves of the high CO2-grown plants, which had greater numbers of smaller stomata and more epidermal cells on the abaxial surface. An asymmetric surface-specific regulation of photosynthesis and stomatal conductance was observed with respect to light orientation. This was not caused by dorso-ventral variations in leaf structure, the distribution of phosphoenolpyruvate carboxylase (PEPC) and ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) proteins or light absorptance, transmittance or reflectance. Adaxial/abaxial specification in the regulation of photosynthesis results from differential sensitivity of stomatal opening to light orientation and fixed gradients of enzyme activation across the leaf.

KeywordsPlant Sciences
Year of Publication2008
JournalNew Phytologist
Journal citation177 (1), pp. 186-198
Digital Object Identifier (DOI)doi:10.1111/j.1469-8137.2007.02218.x
PubMed ID17850248
Open accessPublished as non-open access
Funder project or codeCentre for Crop Genetic Improvement (CGI)
ISSN0028646X
PublisherWiley

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