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. 1990 Nov;94(3):1187–1192. doi: 10.1104/pp.94.3.1187

Isozymes of Superoxide Dismutase in Mitochondria and Peroxisomes Isolated from Petals of Carnation (Dianthus caryophyllus) during Senescence

Marie-Jo Droillard 1, André Paulin 1
PMCID: PMC1077360  PMID: 16667815

Abstract

The balance between reactions involving free radicals and processes which ameliorate their effect plays an important role in the regulation of plant senescence. In this study a method was developed to isolate peroxisomes and mitochondria from carnation (Dianthus caryophyllus L. cv Ember) petals. Based on electron microscopy and marker enzyme levels, the proportion of peroxisomes to mitochondria increases during senescence. The superoxide dismutase (SOD) content of these fractions was examined. Mitochondria and peroxisomes were shown to contain two electrophoretically distinct SODs, a manganese-, and an ironcontaining SOD. The Mn- and Fe-SOD were found to have relative molecular weights of 75,000 and 48,000 and isoelectric points of 4.85 and 5.00, respectively. The presence of a Fe-SOD in mitochondria and peroxisomes is unique because this enzyme is usually located in chloroplasts. The activity of these two isoenzymes decreased during senescence in mitochondria but remained high in peroxisomes from senescent tissue. It is suggested that peroxisomes play a particular role in the process of senescence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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