A new pollinating seed-consuming mutualism between Rheum nobile and a fly fungus gnat, Bradysia sp., involving pollinator attraction by a specific floral compound
A new pollinating seed-consuming mutualism between Rheum nobile and a fly fungus gnat, Bradysia sp., involving pollinator attraction by a specific floral compound
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一种新的授粉种子消耗型大黄和蝇蠓蚋（Bradysia sp.）之间的互利共生关系，涉及特定花卉化合物对授粉媒介的吸引
DOI：
10.1111/nph.12856
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发表时间：
2014-09-01
期刊：
影响因子：
9.4
通讯作者：
Sun, Hang
中科院分区：
文献类型：
--
作者：
Song, Bo;Chen, Gao;Sun, Hang
授粉种子消耗互惠被认为是研究共同进化的典范，但它们是极其罕见的。在这些系统中，嗅觉线索被认为在促进伴侣之间的相遇方面发挥着重要作用。我们提出了一个新的授粉种子消费互利共生从高喜马拉雅山之间的地方性草本植物，大黄，和苍蝇真菌的小昆虫，迟眼蕈蚊。种子生产的迟眼蕈蚊和种子消费的幼虫授粉进行了测量，以确定这种相互作用的结果。通过气味分析和行为测试研究了嗅觉信号在吸引传粉者中的作用。由成蝇授粉产生的种子产量大大高于随后由其幼虫消耗的种子。行为试验表明，植物在开花期释放的一种特殊的花内化合物2-甲基丁酸甲酯对雌蝇具有引诱作用。nobile-Bradysia sp.的相互作用代表了一种新的授粉种子消耗互惠共生关系，并且一种单一的不寻常的化合物是R.在吸引传粉者方面起着关键作用。
Pollinating seed-consuming mutualisms are regarded as exemplary models for studying coevolution, but they are extremely rare. In these systems, olfactory cues have been thought to play an important role in facilitating encounters between partners. We present a new pollinating seed-consuming mutualism from the high Himalayas between the endemic herb, Rheum nobile, and a fly fungus gnat, Bradysia sp.Seed production resulting from pollination by Bradysia flies and seed consumption by their larvae were measured to determine the outcome of this interaction. Floral scent analyses and behavioural tests were conducted to investigate the role of olfactory cues in pollinator attraction.Rheum nobile is self-compatible, but it depends mainly on Bradysia sp. females for pollination. Seed production resulting from pollination by adult flies is substantially higher than subsequent seed consumption by their larvae. Behavioural tests showed that an unusual floral compound, 2-methyl butyric acid methyl ester, emitted by plants only during anthesis, was attractive to female flies.Our results indicate that the R. nobile-Bradysia sp. interaction represents a new pollinating seed-consuming mutualism, and that a single unusual compound is the specific signal in the floral scent of R. nobile that plays a key role in attracting its pollinator.