Corolla morphology facilitates both autogamy and bumblebee pollination in Mimulus guttatus
Corolla morphology facilitates both autogamy and bumblebee pollination in Mimulus guttatus
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DOI：
10.1086/423876
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发表时间：
2004-11-01
影响因子：
2.3
通讯作者：
Kelly, JK
中科院分区：
文献类型：
--
作者：
Arathi, HS;Kelly, JK
斑驳的花冠通常被认为是为了吸引传粉者而进行的一种适应。我们使用表型操作来证明花冠形态在异交和自交中都起着关键的机械作用。在没有传粉者的情况下，花冠的下部通过保留从花药释放的花粉来促进自交。自花受精的很大一部分似乎发生在花的生命周期的后期，因为柱头接触花冠。当传粉者出现时，花冠有助于在昆虫访问之前、期间和之后进行异交。很大一部分交叉花粉实际上是被花冠捕获的，而不是被柱头捕获的。这种接受花粉的“间接”途径表明，在传粉者离开花很长一段时间后，舌状花的很大一部分异花授粉实际上发生了。
The showy corolla of Mimulus guttatus is generally considered an adaptation to attract pollinators. We use phenotypic manipulations to demonstrate that corolla morphology plays a critical mechanical role in both outcrossing and self-fertilization. In the absence of pollinators, the lower portion of the corolla facilitates autogamy by retaining pollen released from the anthers. A substantial portion of self-fertilization seems to occur late in the floral life span as the stigma contacts the corolla. When pollinators are present, the corolla facilitates outcrossing before, during, and after insect visitation. A large fraction of cross-pollen is actually captured by the corolla and not by the stigma. This "indirect'' pathway for pollen reception suggests that a large fraction of cross-pollination in M. guttatus actually occurs long after a pollinator departs from a flower.