caa a22 4500 465806406 CHVBK 20180323112105.0 cr unu---uuuuu 170327e19900801xx s 000 0 eng 10.1007/BF03053474 doi (NATIONALLICENCE)springer-10.1007/BF03053474 Light activation of enzymes in relation to leaf age in Vigna unguiculata (L.) Walp and Zea mays L [Elektronische Daten] [M Begam, M Vivekanandan] The effects of light-dark transition and aplastidic condition by the photobleaching herbicide, 3-amino-1,2,4-triazole, on the activities of enzymes likein vivo nitrate reductase, peroxidase, polyphenol oxidase and catalase were studied in leaves of different ages of 30-day old plants ofVigna unguiculata andZea mays. The activity of nitrate reductase was found to be higher in young leaves and showed a gradual decline at the time of maturity and senescence. In amitrole-bleached young leaves,in vivo nitrate reductase activity was significantly reduced. Although peroxidase is a light-activated enzyme, the enzyme was more active only in fully mature and senescing leaves ofVigna unguiculata. InZea mays, peroxidase activity was more in mature leaves compared to senescent leaves. Interesting feature of this enzyme was that its activity increased upon dark treatment inVigna unguiculata. A similar trend was also observed in polyphenol oxidase activity in mature and senescent leaves ofVigna unguiculata andZea mays. Foliar spray of amitrole increased peroxidase and polyphenol oxidase activities in the young leaves ofZea mays andVigna unquiculata. The results are discussed in relation to age of leaves and the presence or absence of leaf plastids. Indian Academy of Sciences, 1990 Nitrate reductase nationallicence peroxidase nationallicence catalase nationallicence Zea mays nationallicence polyphenol oxidase nationallicence amitrole nationallicence Vigna unguiculata nationallicence Begam M. School of Life Sciences, Bharathidasan University, 620 024, Tiruchirapalli, India aut Vivekanandan M. School of Life Sciences, Bharathidasan University, 620 024, Tiruchirapalli, India aut Proceedings: Plant Sciences Springer India 100/4(1990-08-01), 225-231 0370-0097 100:4<225 1990 100 12388 https://doi.org/10.1007/BF03053474 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF03053474 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Begam M. School of Life Sciences, Bharathidasan University, 620 024, Tiruchirapalli, India aut NATIONALLICENCE 700 1- Vivekanandan M. School of Life Sciences, Bharathidasan University, 620 024, Tiruchirapalli, India aut NATIONALLICENCE 773 0- Proceedings: Plant Sciences Springer India 100/4(1990-08-01), 225-231 0370-0097 100:4<225 1990 100 12388 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer