A role for carbohydrate levels in the control of flowering in citrus |
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| Authors: | EE Goldschmidt N Aschkenazi Y Herzano AA Schaffer SP Monselise |
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| Institution: | Hebrew University of Jerusalem, Department of Horticulture, Rehovot 76100 Israel |
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| Abstract: | Girdling in October of small or large fruitless branches increased 2–3-fold both starch content of leaves and flower numbers as compared with ungirdled ‘Murcott’ mandarin trees. Autumn girdling and GA3 treatments were both effective and additive in increasing starch contents of leaves and twigs of ‘Shamouti’ orange trees. GA3, however, had the expected effect of depressing the reproductive inflorescences in both girdled and ungirdled branches, while girdling had the opposite effect. Girdling and fruit removal in October also additively and dramatically increased flower production in ‘Murcott’. Lowtemperature regimes in a phytotron caused young ‘Minneola’ budlings to flower earlier in the season and more profusely, while having no effect on starch content of leaves and twigs. The interactions of increased carbohydrate content and gibberellin in the control of flower formation in citrus are discussed. |
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| Keywords: | citrus cold temperatures de-fruiting gibberellin girdling |
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