ISHS Acta Horticulturae 441: V Temperate Zone Fruit in the Tropics and Subtropics
EFFECT OF HYDROGEN CYANAMIDE ON APRICOT BUD BREAK AND CATALASE ACTIVITY |
| Authors: | S. Bartolini, C. Vitagliano, F. Cinelli, G. Scalabrelli |
| DOI: | 10.17660/ActaHortic.1997.441.21 |
| Abstract:
Container-grown apricot trees, cv. ‘Tirinto’, were sprayed in December and January of two successive years with 0, 0.5, 1.0, 1.5, or 2.0% aqueous hydrogen cyanamide (HCN) (Dormex SKW). Some trees were placed in a growth chamber (23°C ± 1) 15–20 days after HCN application while others were left outdoors until bud break. Observations on leaf and flower bud break were performed at three-day intervals. Fresh and dry weight and flower bud catalase activity were determined before and after treatment. HCN treatment affected flower and leaf buds differently. The highest concentrations inhibited flower bud break, while the lowest promoted flower bud break when applied during the early stages of dormancy removal. Leaf buds showed better HCN tolerance than flower buds to later treatment dates and higher concentrations. In most cases leaf bud break was enhanced by HCN treatment, particularly when flower bud break was inhibited. Flower bud catalase activity consistently decreased after treatment, but the effect was reversed at a variable rate within 15 to 30 days following treatment. | |
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