Morphology and Anatomy of Stems and Pedicels of Spring Flush Shoots Associated with Citrus Fruit Set |
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Authors: | ERNER YAIR; SHOMER ILAN |
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Institution: | Department of Citriculture, Agricultural Research Organization, The Volcani Center, 6, Bet Dagan, 50250, Israel Food Science, Agricultural Research Organization, The Volcani Center, 6, Bet Dagan, 50250, Israel |
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Abstract: | Flowering and vegetative shoots of Shamouti orangeCitrus sinensis (L.) Osbeck] and Marsh seedlessgrapefruit (Citrus paradisi Macf.) were examined for correlationof their morphology and anatomy with fruit set. Fruit set isfavoured on leafy inflorescences whereas abortion is nearlycomplete on leafless inflorescences. Leafless inflorescencesof Shamouti with one flower were found to havea very thin stem which contained few vascular bundles, whereasthose with three flowers had better-developed vascular systems.The vascular system of leafy inflorescences is significantlydifferent from that of leafless ones and contains a distinctcentral xylem cylinder. The vascular area of leafless inflorescencesis only about one-quarter of that of the leafy ones. The vascularsystem of grapefruit resembles that of the Shamoutiorange. This study emphasizes the importance of the dimensionof the vascular system for fruit set and provides a possibleexplanation for the better fruit set on both leafy and leaflessinflorescences with several flowers compared with single-floweredinflorescences. Anatomy; citrus; fruit set; leafless inflorescence; leafy inflorescence; pedicel; vascular system; vegetative shoot |
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