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Journal of Experimental Botany, Vol. 51, No. 90001, pp. 475-485, February 2000
© 2000 Oxford University Press

Prospects for crop improvement through the genetic manipulation of photosynthesis: morphological and biochemical aspects of light capture

Peter Horton1

Robert Hill Institute for Photosynthesis Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, UK

The prospects for genetic manipulation of photosynthesis are assessed with an emphasis on the biochemical and morphological aspects of light capture. The connection between different parts of the photosynthetic process is considered together with the influence of environmental factors, development and acclimation, and metabolic regulation. The sites of real and potential photosynthetic losses are identified, using tropical rice as a case study. The important interaction between photosynthetic capacity, acclimation to the light environment, nitrogen accumulation and canopy architecture are discussed. The possibility of genetic intervention to increase both biomass accumulation and improve nitrogen economy simultaneously are considered. Finally, the numerous procedures for genetic manipulation of light harvesting are also discussed, with a view to improving radiation-use efficiency in crops.

Key words: Photosynthesis, crop yield, genetic manipulation, light harvesting.


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