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Plant and Cell Physiology, 1985, Vol. 26, No. 7 1303-1311
© 1985

Article

The Senescence Process in Oat Leaves and its Regulation by Oxygen Concentration and Light Irradiance

Victorio S. Trippi and Gloria M. De Luca d'Oro

Laboratorio de Fisiología Vegetal, Facultad de Ciencias E., F.y N., Universidad National de Córdoba Casilla de Correo 395, 5000-Córdoba, República Argentina

The regulation of senescence by oxygen-concentration, light irradiance and H2O2 has been studied in leaf segments of Avena sativa L. cv. Suregrain.

The development of the components of the senescence process, for example chlorophyll breakdown, proteolysis (as soluble amino acids), hydroperoxides (as malondi-aldehyde) and permeability (as conductivity) is accelerated in light as the O2-tension increases. In darkness, 0.3% O2 accelerates increases in hydroperoxides, permeability and proteolysis and delays the chlorophyll break-down, but 0.0005% O2 delays all the components studied. In every case the hydroperoxide content, permeability and proteolysis are closely related. Any treatment inducing an increase in membrane permeability causes chlorophyll bleaching (photo-oxidation) if leaf segments are then treated with light in an atmosphere containing oxygen. Light has a modulating effect on the senescence process. An irradiance lower or higher than 40 W m–2 has an accelerating effect on the senescence process.

(Received September 7, 1985; Accepted July 30, 1985)
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