Gene

Cell biology

Amino acid

Cytokinin

Biology

Proteolysis

Metabolism

Biochemistry

Botany

Auxin

Senescence

Enzyme

Chemistry

Avena

PLANT PHYSIOLOGY

The course of senescence in the first leaves of light-grown Avena seedlings when attached to the plant has been compared with that previously studied in detached leaves and leaf segments. Proteolysis in the leaf, whether attached or detached, is accompanied by markedly polar basipetal transport of amino acids. This polar transport can be superimposed on the known transport of amino acids towards a locally applied cytokinin. In the intact plant, it results in a strong movement into the roots. The reducing sugars, which are set free in senescence, do not participate appreciably in this polar transport phenomenon.

The Metabolism of Oat Leaves during Senescence