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ISHS Acta Horticulturae 34: Symposium on growth Regulators in Fruit Production

THE EFFECT OF ABSCISIC ACID AND GIBBERELLIC ACID ON THE COLD HARDINESS OF APPLE SEEDLINGS AND EXPLANTS

Authors:   J. Pieniazek, T. Holubowicz
DOI:   10.17660/ActaHortic.1973.34.34
Abstract:
Apple explants in continuous illumination at 24°C cultured on basic medium for 18 days increased their frost resistance from -4.4° to -10. 0°C. This acclimatization was accelerated by ABA. GA cultured explants showed growth increases during the first 10 days and a rapid loss of frost resistance. A large increase in water soluble protein was found after ABA and GA treatments. Four-month-old seedlings doubled their frost resistance when exposed to 0°C for 5 days, but ABA and GA sprays were not effective. The increase in water soluble protein was not reflected in frost hardiness.

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