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Differential effects of light and phytohormones in the senescence of apical and basal segments of barley leaves



Differential effects of light and phytohormones in the senescence of apical and basal segments of barley leaves



Phyton (Buenos Aires) 50(1-2): 133-140



We have compared the senescence of detached apical and basal segments of barley (Hordeum vulgare L.) leaves. Senescence has been estimated by chlorophyll and protein loss. Apical segments show a higher rate of senescence than basal segments. The retardation of senescence by brief red light interruptions (in a phytochrome mediated process) and by continuous white, blue, green or red lights is more effective in basal than in apical segments and may be related to stimulation of the biogenetic processes. In contrast, the retardation of senescence by near ultraviolet light and cytokinins and the enhancement of senescence by abscisic acid and ethylene are more effective in apical segments, suggesting that these last factors act mainly on the degradative processes. The results suggest that light controls senescence through several mechanisms which, like the control by phytohormones, depends on the developmental stage of the leaf segments.

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Accession: 002072594

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