Pollinator attraction to volatiles from virgin and pollinated host flowers in a yucca/moth obligate mutualism
Pollinator attraction to volatiles from virgin and pollinated host flowers in a yucca/moth obligate mutualism
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DOI：
10.1111/j.1600-0706.2011.19258.x
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发表时间：
2011-10
期刊：
影响因子：
3.4
通讯作者：
G. Svensson;O. Pellmyr;R. Raguso
中科院分区：
文献类型：
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作者：
G. Svensson;O. Pellmyr;R. Raguso
丝兰和丝兰蛾之间的经典专性授粉种子消费互惠关系一直被认为是介导的化学线索，但在这个协会传粉吸引宿主花挥发物的经验数据一直缺乏。在这里，我们表明，从处女花的主机丝兰的气味是足以吸引其专性传粉Tegeticula yuccasella在Y型管嗅觉测试。有趣的是，两种性别的飞蛾都被气味刺激所吸引。由于丝兰蛾交配内宿主花，吸引双方的女性和男性的主机花挥发物很可能会增加遇到率。在第二个测试中，雌蛾没有区分处女和手授粉花，表明没有授粉后的变化，气味生产的主机，将导致减少传粉吸引力，从而限制利用可用的种子在主机花。然而，其他可能稳定T。丝兰属及其丝兰宿主已经有文献记载，即严重侵染的花的选择性败育，以及源自雌性的宿主标记信息素。采用顶空收集和气相色谱-质谱联用技术对Y. glauca与另外两种异域分布的蒴果种Y. elata和Y. filamentosa，揭示了强烈的保护这一特点内丝兰节Chaenocarpa。
The classic obligate pollination–seed consumption mutualism between yuccas and yucca moths has been thought to be mediated by chemical cues, but empirical data on pollinator attraction to host floral volatiles in this association have been lacking. Here we show that the scent from virgin flowers of the host Yucca glauca is sufficient to attract its obligate pollinator Tegeticula yuccasella in Y-tube olfactometer tests. Interestingly, both sexes of moths were attracted to the scent stimulus. Because yucca moths mate inside host flowers, the attraction of both females and males to host floral volatiles is likely to increase encounter rates. In a second test, female moths did not discriminate between virgin and hand-pollinated flowers, indicating no post-pollination change in scent production by the host that would lead to a reduction in pollinator attraction and thereby limit exploitation of the available seeds in host flowers. However, other mechanisms that could stabilise the mutualism between T. yuccasella and its yucca hosts have already been documented, i.e. selective abortion of heavily infested flowers, and a female-derived host-marking pheromone. Headspace collection and GC–MS were used to identify the blend of floral volatiles emitted by Y. glauca, which was found to be very similar to those of two other allopatric capsular-fruited species, Y. elata and Y. filamentosa, revealing strong conservation of this trait within Yucca section Chaenocarpa.