Abstract
Abstract The ultrastructure of floral abscission zone cells of Phaseolus vulgaris L. cv. Dark Red Kidney was studied in order to relate changes in fine structure to known changes in morphology and physiology of the foliar abscission zone of Phaseolus and to the fine structure of floral abscission zones of other plants. Major structural changes in cell walls are similar in abscission zones of senescing leaves and post-anthesis flowers but the rapidity of cellular changes is greatly accelerated in the latter. Inclusions typically found in floral abscission zone cells of Solanaceous plants are not present in Phaseolus floral abscission zone cells. Cellular changes are evaluated in terms of their potential relationship to the abscission process.
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