Journal Article

The role of fructan in flowering of <i>Campanula rapunculoides</i>

Rudy Vergauwen, Wim Van den Ende and André Van Laere

in Journal of Experimental Botany

Volume 51, issue 348, pages 1261-1266
Published in print July 2000 | ISSN: 0022-0957
Published online July 2000 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jexbot/51.348.1261
The role of fructan in flowering of Campanula rapunculoides

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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.

Keywords: Campanula; inulin; fructan; flowering.; DP, degree of polymerization; FFT, fructan : fructan 1‐fructosyl transferase

Journal Article.  2961 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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