The role of fructan in flowering of Campanula rapunculoides
The role of fructan in flowering of Campanula rapunculoides
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DOI：
10.1093/jexbot/51.348.1261
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发表时间：
2000-07-01
影响因子：
6.9
通讯作者：
Van Laere, A
中科院分区：
文献类型：
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作者：
Vergauwen, R;Van den Ende, W;Van Laere, A
在风铃草各营养器官中均检测到菊糖型果聚糖。植物，所有花部分含有果聚糖在某些发育阶段。萼片在发育过程中逐渐减少。而花瓣在蕾期就开始贮藏果聚糖。花开放期间的快速分解导致高浓度的葡萄糖，特别是果糖，这可能有助于花瓣扩张中涉及的渗透驱动力。在完全枯萎之前，己糖显然是从花的部分中输出的。果聚糖在花开放时从雄蕊和花柱组织中水解并输出。同样，子房中的主要果聚糖储备几乎与花的其他部分同时被分解。己糖在卵巢中没有达到高水平，可能是因为它们被迅速代谢和/或被发育中的种子吸收。
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.