Abstract
Inulin type fructan was detected in all vegetative organs of Campanula rapunculoides L. plants. All flower parts contained fructan at some developmental stage. A steady decrease was found in sepals during development. Petals, however, stored fructan in the bud stage. A rapid breakdown during opening of the flower resulted in high concentrations of glucose and especially fructose that may contribute to the osmotic driving force involved in petal expansion. Before complete shrivelling, the hexoses were apparently exported from flower parts. Fructans were hydrolysed and exported from the stamen and style tissue upon flower opening. Similarly, the major fructan reserves in the ovary were broken down almost simultaneously with those in other flower parts. Hexoses did not reach high levels in the ovary, probably because they were rapidly metabolized and/or incorporated by developing seeds.
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