Patra H K, Mishra D
Laboratory of Plant Biochemistry and Enzymology, P. G. Department of Botany, Ravenshaw College, Cuttack 753003, Orissa, India.
Plant Physiol. 1979 Feb;63(2):318-23. doi: 10.1104/pp.63.2.318.
Inorganic pyrophosphatase, peroxidase, and polyphenoloxidase activities were studied as the function of leaf insertion level in eight monocotyledonous and eight dicotyledonous species. Alkaline inorganic pyrophosphatase shows a declining activity toward the end of senescence whereas no regular drift in either peroxidase or polyphenoloxidase activities was noticed during senescence of attached leaves. In the primary leaves of rice, peroxidase and polyphenoloxidase activities were high in the senescent leaves and there exists a correlation between chlorophyll content and peroxidase activity though not with polyphenoloxidase activity. Upon detachment leaves exhibit increasing peroxidase and polyphenoloxidase activities with time. The distribution of the enzyme activities during senescence of attached leaves is suggested to be species-specific, and an increase in peroxidase and polyphenoloxidase activities cannot be taken as an indicator of leaf senescence.
研究了8种单子叶植物和8种双子叶植物中无机焦磷酸酶、过氧化物酶和多酚氧化酶的活性与叶片着生位置的关系。碱性无机焦磷酸酶在衰老末期活性下降，而在附着叶片衰老过程中，过氧化物酶或多酚氧化酶的活性均未出现规律性变化。在水稻的初生叶中，衰老叶片中的过氧化物酶和多酚氧化酶活性较高，叶绿素含量与过氧化物酶活性之间存在相关性，而与多酚氧化酶活性无关。叶片脱离后，过氧化物酶和多酚氧化酶的活性随时间增加。附着叶片衰老过程中酶活性的分布具有物种特异性，过氧化物酶和多酚氧化酶活性的增加不能作为叶片衰老的指标。
