生物多样性 ›› 2007, Vol. 15 ›› Issue (6): 592-598.DOI: 10.1360/biodiv.070156

所属专题: 植物与传粉者相互作用

• 论文 • 上一篇    下一篇

广东地区外来种五爪金龙的传粉生物学研究

贾效成1,2, 李新亮1,2, 丹阳3, 路国辉1,2, 王英强1,2*   

  1. 1 (华南师范大学生命科学学院, 广州 510631)
    2 (华南师范大学广东省植物发育生物工程重点实验室, 广州 510631)
    3 (中国科学院华南植物园, 广州 510650)
  • 出版日期:2007-11-20 发布日期:2007-11-20

Pollination biology of an invasive weed Ipomoea cairica

Xiaocheng Jia1, 2, Xinliang Li1, 2, Yang Dan3, Guohui Lu1, 2, Yingqiang Wang1, 2*   

  1. 1 College of Life Science, South China Normal University, Guangzhou 510631
    2 Guangdong Provincial Key Lab of Biotechnology for Plant Development, South China Normal University, Guangzhou 510631
    3 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650
  • Online:2007-11-20 Published:2007-11-20

摘要: 五爪金龙(Ipomoea cairica)是一种匍匐或攀援生长的入侵杂草。2006–2007年作者在广东地区开展了对该入侵种的传粉生物学研究。五爪金龙在广东全年均可开花, 花序为聚伞花序, 花冠为紫色或蓝紫色喇叭状。开花时间在早晨4: 30–5: 20之间, 下午17: 40闭合, 持续大约12 h。每朵花平均分泌花蜜量为5.82 ± 2.47 μL (n = 10), 花蜜平均含糖量为41.03 ± 6.52%, 氨基酸含量为0.042 mg/mL。开花过程中花粉活性和柱头可受性均保持较高水平(>90%)。花粉/胚珠比率(P/O)为4,778.18 ± 264.58 (n = 10)。木蜂(Xylocopa sp.)是其有效的传粉昆虫, 蝇类和蝶类为随机访问者。开花过程中柱头与花药相接触, 有利于自花授粉。然而, 繁育系统的研究表明五爪金龙是自交不亲和植物, 其种子仅能通过异花授粉获得。

Abstract: During May to July, 2006 and April to May, 2007, we studied pollination biology in Ipomoea cairica, an invasive weed in Guangdong Province, China. Ipomoea cairica is a perennial creeping or climbing herbaceous vine, blooming all year round in Guangdong. The flowers gathered in cymes, with a purple or bluish purple bell-formed corolla. The petals unfolded at about 4:30–5:20 and closed at 17:40, lasting for about 12 hours. The proximity of the stigma and anthers during flowering period facilitated the transfer of self-pollen. The mean volume of nectar per flower was 5.82 ± 2.47 μL (n = 10), with a sugar concentration of 41.03 ± 6.52% and an amino acid concentration of ca. 0.042 mg/mL. During anthesis, both pollen viability and stigma receptivity remained at a high level (>90%). The mean P/O ratio was 4,778.18 ± 264.58 (n = 10). Carpenter Bees (Xylocopa sp.) were considered as effective pollinators, while flies and butterflies were occa-sional visitors. Ipomoea cairica is self-incompatible as determined by an absence of fruit set in the flowers following controlled hand self-pollination, producing fruits and viable seeds only after cross-pollination.