Journal of Experimental Botany, Vol. 51, No. 90001, pp. 329-337,
February 2000
© 2000 Oxford University Press
Five ways to stay green
Cell Biology Department, IGER, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB, UK
The relationship between carbon income and expenditure over the life of a leaf is described and related to the productivity benefits of altering the timing of senescence initiation. In genetic variants with delayed leaf senescence (‘stay-greens’) deconstruction of the photosynthetic apparatus during leaf senescence is partially or completely prevented. Although the stay-green phenotype is superficially similar in all species and genotypes, the genetic and physiological routes to the trait are diverse. In one type of stay-green, chlorophyll catabolism is disabled. Legumes and monocots with pigment breakdown lesions are discussed. Sorghum is presented as an example of another kind of stay-green in which perennial tendencies have been bred into a monocarpic annual crop species. Transgenic approaches are briefly discussed (enhanced endogenous cytokinins, reduced ethylene production or perception). An alternative route towards making a stay-green phenotype is through quantitative trait mapping and marker-assisted selection. Loci for greenness in pearl millet have been identified, some of which are associated with drought responses or flowering time. Finally the question of the limits on stay-green as a productivity-enhancing character is addressed.
Key words: Leaf senescence, productivity, stay-green, mutant, chlorophyll, sorghum, transgenic, pearl millet, QTL, drought.
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