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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).
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.
URL: http://dx.doi.org/10.1111/j.1469-8137.2007.02218.x
DOI: 10.1111/j.1469-8137.2007.02218.x
PubMed id: 17850248
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