Role of peroxidase during ethylene induced chlorophyll breakdown in cucumis sativus cotyledons

Abeles, F.B.; Dunn, L.J.

Journal of Plant Growth Regulation 8(4): 319-326


ISSN/ISBN: 0721-7595
Accession: 007763833

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Yellowing is a visible result of ethylene-enhanced senescence. In certain plants, such as Cucumis sativus, an increase in peroxidase levels occurs during this period. Experiments described here were designed to test the hypothesis that peroxidase levels induced during senescence play a role in chloroplast degradation. Inhibitors of heme synthesis and protein glycosylation, which had no effect on chlorophyll degradation, reduced the synthesis of pI 9 peroxidase. Decapitation of seedlings, which enhanced greening of cotyledons, increased levels of peroxidase. These observations are consistent with the view that while the role of aging- or ethylene-induced peroxidases are not known, they are not involved in chlorophyll degradation.