Kar M, Mishra D
Laboratory of Plant Biochemistry and Enzymology, Department of Botany, Utkal University, Bhubaneswar 751004, Orissa, India.
Plant Physiol. 1976 Feb;57(2):315-9. doi: 10.1104/pp.57.2.315.
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.
对附着和脱离的水稻（Oryza sativa L. cv. Ratna）叶片中的过氧化氢酶、过氧化物酶和多酚氧化酶的活性进行了研究。在附着和脱离的水稻叶片衰老过程中，过氧化氢酶活性下降，而过氧化物酶和多酚氧化酶活性增加。已知能延缓脱离水稻叶片衰老的激动素（5μm）和苯并咪唑（1mm），在脱离叶片衰老过程中减缓了过氧化氢酶活性的下降。另一方面，与水对照相比，这些化学物质加速了过氧化物酶和多酚氧化酶活性的增加。总酚类物质在脱离并遮光的水稻叶片中积累，但在光照下附着叶片衰老过程中未观察到酚类物质的积累。
