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Plant and Cell Physiology, 1986, Vol. 27, No. 6 1051-1061
© 1986

Article

Membrane Permeability—Regulation by Exogenous Sugars during Senescence of Oat Leaf in Light and Darkness

Celina M. Luna and Victorio S. Trippi

Laboratorio de Fisiología Vegetal, Facultad de Ciencias Ex., F.y N. Universidad Nacional de Córdoba Casilla de Correo 395, 5000—Córdoba, Republica Argentina

The effect of sugars (sucrose, glucose and fructose) on normal physiological changes during senescence of foliar segments of Avena sativa cv. Suregrain was studied. In general application of sugars raised tissue permeability both in the light and in darkness. This change was associated with increases in endogenous sugars, hydroperoxide content and lipoxygenase activity. In the light it was also associated with low catalase activity. Sugars did not influence superoxide dismutase activity. In the light, sugars accelerated senescence, measured as decreases in chlorophyll and increases in soluble amino acids. In darkness sugars delayed senescence. The effect of sugars in the light seemed to result from an increase in photo-oxidations associated with the increase in permeability. The delaying effect on senescence, found in darkness, seemed to result from an increase in respiratory activity plus the lack of (or combined with the lack of) photo-oxidations.

(Received March 18, 1985; Accepted June 3, 1986)
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