濒危灌木棉棉机械与甲虫自花授粉的比较

K. Krakos, G. Booth, P. Bernhardt
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引用次数: 4

摘要

濒危,夏威夷,地方病,棉棉的实验手授粉。例(Malvaceae)表明它是自交亲和的,但自花授粉导致生殖产量降低。野外观察和荧光显微镜花粉管分析表明,该物种的机械自花授粉包括一种称为弯曲柱头的机制。在17株毛毡花中,有7%的花的受感柱头向后弯曲并接触开裂的花药。黄花无花蜜,除了引进的nitidulid甲虫Aethina concolor Macleay外,大多数嗜花昆虫都不光顾。采集资料和昆虫gi道解剖显示,紫锥蝽携带并食用寄主花的花粉。实地观察记录了甲虫在离花过程中与柱头裂片的定期接触,影响了自花授粉。行为实验表明,甲虫对黄色的视觉提示反应积极。在某些情况下,引入花粉媒介可能有助于在岛屿地方性疾病中维持低水平的繁殖成功率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanical vs. Beetle-mediated Self-pollination in Gossypium Tomentosum (Malvaceae), an Endangered Shrub
Experimental hand pollinations of the endangered, Hawaiian, endemic, Gossypium tomentosum Nutt. Ex. (Malvaceae) showed that it was self-compatible, but self-pollination resulted in reduced reproductive output. Field observations and pollen tube analyses using fluorescence microscopy showed that mechanical self-pollination in this species included a mechanism known as bending stigmas. A receptive stigma bent backwards and contacted dehiscent anthers in 7% of flowers found on 17 G. tomentosum plants. The yellow flowers were nectarless and were not visited by most anthophilous insects in situ except for the introduced, nitidulid beetle, Aethina concolor Macleay. Collections and insect GI-tract dissections showed that A. concolor carried and ate the pollen of the host flower. Field observations recorded regular contact between beetles and stigma lobes as these insects exited the flowers effecting self-pollination. Behavioral experiments showed that the beetles responded positively to a yellow visual cue. Under some circumstances, an introduced pollen vector may help maintain a low level of reproductive success in an insular endemic.
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