Influence of phloem transport on flower abscission in Hibiscus rosa-sinensis |
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Authors: | Doris Krabel Walter Eschrich |
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Affiliation: | (1) Institut für Forstbotanik der Universität, Büsgenweg 2, D-3400 Göttingen, Germany |
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Abstract: | Summary Flowering cultivars of Hibiscus rosa-sinensis L. were either cross-pollinated or self-pollinated. Fruit set was observed on 52% of the cross-fertilized flowers, while only 4.6% of the self-fertilized flowers were not abscised. Once during fruit and seed growth, the subtending leaf was exposed to 14CO2, and translocation of labelled photoassimilate was recorded by macro- and microautoradiography. Phloem transport into the raphe occurred in both fruits with fertilized and fruits with non-fertilized ovules. Since empty ovules showed some sink strength, it is assumed that growth of vegetative seed-tissue signalizes the retardation of completion of the abscission process. During fruit growth a considerable amount of starch is deposited in the distal layer of the abscission zone. Part of this starch is consumed during growth of cross-fertilized fruits. |
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Keywords: | Fruit abscission Hibiscus rosa-sinensis Microautoradiography Phloem transport Starch deposition |
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