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The ability of arginine (50 mM), putrescine (10 and 20 mM), and spermidine (10 and 20 mM) to enhance low temperature stressed-induced flowering of 5-year-old container-grown `Washington' navel orange trees was evaluated. The metabolites were applied to the foliage at the end of the 4-week low-temperature treatment of 8-h days at 10°C and 16-h nights at 7°C; the trees were then moved to warmer conditions. All treatments had a positive effect on floral intensity. Putrescine (20 mM) and spermidine (10 mM) significantly increased (P = 0.05) total flower number and both the number and proportion of leafless inflorescences per tree. However, the number of floral shoots per tree, as well as the number of leafy inflorescences and number of vegetative shoots were not significantly influenced by the metabolites. The results suggest that polyamines are important to the development of flowers, but not leaves, along the axis of the inflorescence.

hortscience

590 PB 138 LOW-TEMPERATURE STRESSED-INDUCED FLOWERING OF THE `WASHINGTON' NAVEL ORANGE (CITRUS SINENSIS L. OSBECK) WAS INCREASED BY APPLICATION OF PUTRESCINE OR SPERMIDINE TO THE FOLIAGE