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Indole-3-acetic acid content and glutamine synthetase activity in the pericarp, and peroxidase activity and isoenzymes in the meso- and exocarp of growing peach fruits
Authors:Cristina Sá  nchez-Roldá  n, Antonio Heredia, Victoriano Valpuesta  Martin J. Bukovac
Affiliation:(1) Departamento de Bioquímica y Biología Molecular, Universidad de Málaga, 29071 Málaga, Spain;(2) Department of Horticulture, Michigan State University, 48824 East Lansing, Michigan, USA
Abstract:The indole-3-acetic acid (IAA) content in peach pericarp (Prunus persica L. Batsch cv. Merry) was highest at early stage I of development (sim200 ng/g fresh wt), decreased to the lowest level during stage II, and rose again at stage III to 60–70 ng/g fresh wt. High activity of glutamine synthetase was found in the pericarp during stage I. The soluble peroxidase activity was highest in the meso- and exocarp at stage II, and isoenzymatic changes in this fraction corresponded to the transition from cationic isoenzymes, predominant at stage I, to anionic isoenzymes at stage III. The ionically bound peroxidase activity in these tissues was highest at stage I. The three developmental stages showed marked differences in auxin content and enzyme activities; for peroxidases these changes reflect a developmental expression pattern for the isoenzymes.
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