Submitted to: Proceedings of Plant Growth Regulation Society of America
Publication Type: Proceedings
Publication Acceptance Date: 12/1/2004
Publication Date: 2/1/2005
Citation: Curry, E.A. Delayed ripening of apple and pear fruit using postharvest dips of aminoethoxyvinylglycine (avg). Proceedings of Plant Growth Regulators Society of America. p. 137-138. 2005.
Technical Abstract: Regulation of fruit ripening allows more flexibility both in harvesting and marketing - usually with improved uniformity and retention of quality. Efficacy of pre-harvest foliar applications of AVG have been inconsistent because of 1) the long interval (3-5 weeks) between treatment and time of harvest; 2) inadequate coverage due to canopy interference; and 3) differences in climatic conditions between seasons and among orchards. Postharvest dipping or drenching of fruit would increase efficacy, improve coverage uniformity, and reduce environmental residue. 'Golden Delicious' apples and 'Bartlett' pears were dipped for 2 min. in solutions of AVG from 0 to 400 mg.1**-1. Apples were kept at 20 deg C for 9 weeks and pears were kept at 1 deg C for 5 months. By measuring CO2 and C2H4 daily, delay in ripening initiation for apples treated with 0, 100 and 200 mg.1**-1 was 7, 35 and 55 days, respectively. At 9 weeks, apples treated with 400 mg.1**-1 failed to ripen. After 5 months, pears dipped in [AVG] > 0 produced less ethylene out of storage than those dipped in water alone. Compared with a preharvest foliar spray at the same dosage, pears treated after harvest gained 4 weeks storage life.