Ontogeny and Hormonal Control of Polyphenoloxidase Isozymes in Tobacco Pith 1

AUTOR(ES)

Stafford, H. A.

RESUMO

Isozymes of tobacco pith polyphenoloxidases (o-diphenol oxidase, EC 1.10.3.1) were separated electrophoretically from fresh pith of intact plants and from cultured pith sections. Extracts of fresh pith contained a poorly resolved complex of two to three anodic bands after starch gel electrophoresis at alkaline pH. This anodic complex was more active with chlorogenic acid than with 3,4-dihydroxyphenylalanine and was found in greater activity per gram fresh weight of tissue in younger internodes than in older ones. The longitudinal gradient of activity was thus the opposite of that found for the constitutive isozymes of peroxidase.

Documentos Relacionados

• Hormonal Control of Tobacco Crown Gall Tumor Morphology 1
• Induction of Indoleacetic Acid Synthetases in Tobacco Pith Explants 1
• Cytokinin Effects on Growth of Quiescent Tobacco Pith Cells 1
• Differential Effects of Ethylene on Pith Peroxidase of Intact Tobacco Plants and Excised Tissue 1
• Tissue Distribution, Ontogeny, and Hormonal Regulation of Xenobiotic Transporters in Mouse Kidneys