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» Articles » PMID: 16659474

Catalase, Peroxidase, and Polyphenoloxidase Activities During Rice Leaf Senescence

Overview
Journal Plant Physiol
Specialty Physiology
Date 1976 Feb 1
PMID 16659474
Citations 188
Authors
M Kar
D Mishra
Affiliations
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Abstract

The activities of catalase, peroxidase, and polyphenoloxidase were studied in attached and detached rice (Oryza sativa L. cv. Ratna) leaves. Catalase activity decreased while peroxidase and polyphenoloxidase activities increased during senescence of both attached and detached rice leaves. Kinetic (5 mum) and benzimidazole (1 mm), which are known to delay the senescence of detached rice leaves, retarded the decrease of catalase activity during detached leaf senescence. On the other hand, these chemicals accelerated the increase of peroxidase and polyphenoloxidase activities over the water control. Total phenolics accumulated in detached and darkened rice leaves, but in attached leaf senescence in light no accumulation of phenolics was observed.

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