祝丽香桔梗开花后可溶性糖与淀粉分配特性研究报告.docVIP

桔梗开花后可溶性糖和淀粉分配特性研究 祝丽香 王建华 孙印石 唐行涛 耿慧云 （1 山东农业大学农学院·作物生物学国家重点实验室，山东泰安 271018） 摘要：以2年生桔梗为材料，研究开花后植株体内可溶性糖和淀粉的分配特性。结果表明，在桔梗开花和果实发育过程中，根部淀粉、可溶性糖含量逐渐下降，开花后25 d 降至最低。花枝和去花枝中可溶性糖含量开花后15 d降至最低而后逐渐上升，淀粉含量变化趋势明显不同，花枝淀粉含量呈现先上升后下降的单峰曲线，去花枝淀粉开花后呈上升趋势。去花枝叶片中可溶性糖含量高于花枝。与前1 d 17：00时相比，经过一夜的消耗，早晨8：00时花枝叶片可溶性糖含量没有显著差别，而去花枝叶片则明显降低，叶片中淀粉含量与可溶性糖含量变化趋势相反。结果表明，桔梗开花后25 d内，根部淀粉分解为可溶性糖运至茎部暂时储存后，供给叶片、花和果实发育。25 d后，根部淀粉和可溶性糖含量开始升高，植株地上部分制造的有机物向根部供应促进根部发育。 关键词：桔梗；淀粉；可溶性糖；分配特性 中图分类号：S567.2 文献识别码：A 文章编号：0513-353X（2009） The Soluble Sugar and Starch Allocation Characteristics after Flowering Developing in Platycodon grandiflorium ZHU Li-xiang , WANG Jian-hua*, SUN Yin-shi, TANG Xing-tao, and GENG Hui-yun (1 State Key Laboratory of Crop Biology, College of Agronomy, Shandong Agricultural University,271018 Taian,China) Abstract: Two-year-old Platycodon grandiflorum was used as materials to study the allocation characteristics of soluble sugar and starch during the flowering and fruiting stage. The results showed that the contents of starch and soluble sugar in root decreased gradually and reached the minimum at 25 d after flowering. The soluble sugar content in branches declined gradually at first and reached the minimum at 15 d after flowering, lately increased. The content of starch in branches showed significantly difference between branches with flower and flower cutted-off. The content of starch in branches with flower appeared the trend of rise at first then dropping, while the starch content in branches with flower cutted-off showed significantly rising trend. The total soluble sugar content was higher in the leaves with flower cutted-off than that in leaves with flower. Compared with that at 17:00 on the previous day, after one night consumption, the total soluble sugar content in the leaves with flower cutted-off decreased obviously at 8:00 a.m, but the change in the leaves with flower was not obvious. The starch content in leaves appeared opposite tendency comparing with