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. 1970 May;45(5):604–607. doi: 10.1104/pp.45.5.604

Effects of Iron and Copper Ions in Promotion of Selective Abscission and Ethylene Production by Citrus Fruit and the Inactivation of Indoleacetic Acid 1

S Ben-Yehoshua a,2, R H Biggs a
PMCID: PMC396471  PMID: 16657352

Abstract

Application of Cu2+ (<10-2 M) and Fe3+ ions as aqueous solutions of chloride salts promoted fruit abscission, erratic rind damage, and ethylene production of various citrus species with little to no defoliation. Mixing of 10-5 M Cu2+ or Fe3+ ions with equimolar indole-3-acetic acid resulted in a reduction of the ultraviolet absorption at 220 nanometers, and an increase at 245 nanometers. Ultraviolet irradiation accelerated the change by Fe3+ and Cu2+ ions in the absorption of indole-3-acetic acid. Pretreatment of indole-3-acetic acid with Fe3+ and Cu2+ ions for 6 hours resulted in more than 90% reduction in its growth-promoting activity in the Avena bioassay, even when cations were removed by chromatography. Acceleration of abscission by Fe3+ and Cu2+ ions could be related to both promotion of ethylene production and direct inactivation of auxin.

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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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