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Adaxial/abaxial specification in the regulation of photosynthesis and stomatal opening with respect to light orientation and growth with CO 2 enrichment in the C4 species Paspalum dilatatum

Lookup NU author(s): Professor Christine Foyer


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• 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 μl 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. © The Authors (2007).

Publication metadata

Author(s): Soares AS, Driscoll SP, Olmos E, Harbinson J, Arrabaca MC, Foyer CH

Publication type: Article

Publication status: Published

Journal: New Phytologist

Year: 2008

Volume: 177

Issue: 1

Pages: 186-198

Print publication date: 01/01/2008

ISSN (print): 0028-646X

ISSN (electronic): 1469-8137

Publisher: Wiley-Blackwell Publishing Ltd.


DOI: 10.1111/j.1469-8137.2007.02218.x

PubMed id: 17850248


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