Cell Isoperoxidases in Sweet Potato Plants in Relation to Mechanical Injury and Ethylene

AUTOR(ES)

Birecka, Helena

RESUMO

Leaves and storage roots of sweet potato plants (Ipomea batatas) showed the same qualitative isoperoxidase patterns and a similar distribution of distinctive isoperoxidases between the cell protoplast and cell wall free, ionically bound, and covalently bound fractions. No changes in the qualitative isoenzyme spectrum were found in relation to age, mechanical injury, or ethylene action. Thus, as in tobacco plants, the cell isoperoxidases in sweet potato did not reflect the possible differential mRNA synthesis in relation to organ, age, or injury. Transcription does not seem to be a limiting factor in injury- and ethylene-dependent peroxidase enhancement during the first 24 hr.

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