Corolla wilting facilitates delayed autonomous self-pollination in Pedicularis dunniana (Orobanchaceae)
Corolla wilting facilitates delayed autonomous self-pollination in Pedicularis dunniana (Orobanchaceae)
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DOI：
10.1007/s00606-004-0260-x
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发表时间：
2005-03
影响因子：
1.9
通讯作者：
S.-G. Sun;Y.-H. Guo;R. Gituru;S.-Q. Huang
中科院分区：
文献类型：
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作者：
S.-G. Sun;Y.-H. Guo;R. Gituru;S.-Q. Huang
与花冠枯萎相关的结构变化可能是影响自花授粉的一种机制。传粉者访花次数少，种子产量高，花后花冠宿存，说明丹尼亚马先丹是自交的。花冠枯萎有助于延迟自主自花授粉。上唇(盔瓣)的枯萎使富含花粉的花药与柱头接触，导致柱头上沉积自体花粉。花的结实率显著低于开放授粉的花，无论是去势的花，还是带有抑制的银幕从而阻止花药擦过柱头的花。这表明自交通过花冠枯萎在该物种中发生。发芽试验表明，由于近交衰退，异交苗比自交苗更有活力。这很可能是自交为P提供了生殖保证。在传粉者稀少的条件下。
Structural changes associated with corolla wilting may serve as a mechanism for effecting self-pollination. Low pollinator visitation, high seed production and a corolla that persists after anthesis indicates thatPedicularis dunnianais autogamous. Delayed autonomous self-pollination is facilitated by corolla wilting. Wilting of the upper lip (galea) brought the pollen laden anthers into contact with the stigma resulting in the deposition of self pollen on the stigma. The seed set of flowers either emasculated, or with restrained galeae thus preventing anthers brushing against the stigma, was significantly lower than that of open-pollinated flowers. This demonstrates that autogamy occurs in this species through corolla wilting. Germination experiments indicated that outcross seedlings were more vigorous than selfed seedlings as a result of inbreeding depression. It is likely that autogamy provides reproductive assurance forP. dunnianaunder conditions of pollinator scarcity.