Autonomous self-pollination and insect visitation in a saprophytic orchid, Epipogium roseum (D. Don) Lindl.
Autonomous self-pollination and insect visitation in a saprophytic orchid, Epipogium roseum (D. Don) Lindl.
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腐生兰花 Epipogium Roseum (D. Don) Lindl 的自主自花授粉和昆虫拜访。
DOI：
10.1071/bt11265
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发表时间：
2012
影响因子：
1.1
通讯作者：
Jiangyun Gao
中科院分区：
文献类型：
--
作者：
Xiang Zhou;Hua Lin;Xuli Fan;Jiangyun Gao
荒漠植物的生殖生物学研究很少。玫瑰花是一种小型腐生兰花，广泛分布于亚洲热带、亚热带、澳大利亚和非洲。对E. roseum的研究。e.蔷薇属具有专性自花授粉系统，其中退化的喙部已经失去其作为分离柱头和雄蕊（花粉块）的物理屏障的功能，从而允许柱头分泌物和花粉块在芽发育期间接触。E的花朵玫瑰花通常开放，并成功地吸引昆虫游客。亚洲蜜蜂（Apis cerana cerana）是唯一的访客，并定期访问E。玫瑰花花蜜但由于E.结果还表明，亚洲蜜蜂对E. roseum的座果没有贡献。玫瑰。亚洲蜜蜂对E. roseum在空间和时间上都有变化。e. roseum不经历由昆虫介导的异交，并且适于专性自花授粉。我们认为，这可能是由于其sacertic生活方式相关的传粉服务的不确定性而演变的。我们目前的研究并不支持专性自花受精是由于资源有限的真菌异养植物青睐的假设。
Reproductive biology of saprophytic plants has been poorly studied. Epipogium roseum (D.Don) Lindl. is a small saprophytic orchid that is widely distributed in tropical and subtropical Asia, Australia and Africa. The floral biology and insect visitation of E. roseum were studied in Xishuangbanna, south Yunnan Province, China. E. roseum possesses an obligate self-pollination system, in which the degenerative rostellum has lost its function as a physical barrier separating the stigma and stamens (pollinia), allowing contact between the stigmatic secretions and the pollinia during bud development. Flowers of E. roseum usually open and successfully attract insect visitors. The Asian honey bee (Apis cerana cerana) was the only visitor observed, and regularly visited flowers of E. roseum for nectar. However, these bees did not carry pollinia away after visiting the flowers due to the absence of a viscid disk in E. roseum; the results of experiments also indicated that the Asian honey bee does not contribute to fruit set in E. roseum. The visiting frequency of Asian honey bees to flowers of E. roseum varied both spatially and temporally. E. roseum does not undergo outcrossing mediated by insects and is adapted to obligate self-pollination. We suggest that this may have evolved because of the uncertainty of pollinator services associated with its saprophytic lifestyle. Our current studies do not support the hypothesis that obligate autogamy is favoured by myco-heterotrophic plants due to resource limitations.