Pollinator attraction in Cornus capitata (Cornaceae) : the relative role of visual and olfactory cues
Pollinator attraction in Cornus capitata (Cornaceae) : the relative role of visual and olfactory cues
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DOI：
10.1093/jpe/rtv012
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发表时间：
2015-04
影响因子：
2.7
通讯作者：
Bo Song;Yang Niu;J. Stöcklin;Gao Chen;Deli Peng;Yongqian Gao;Hang Sun
中科院分区：
文献类型：
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作者：
Bo Song;Yang Niu;J. Stöcklin;Gao Chen;Deli Peng;Yongqian Gao;Hang Sun
花的视觉表现和花的气味在有花植物与传粉者之间的交流中起着重要作用。然而，视觉和嗅觉线索在传粉者吸引中的相对作用在很大程度上尚不清楚。在这项研究中，我们确定了两种类型的线索在吸引传粉者到山茱萸中的作用，山茱萸是一种中等大小的树，每个头状花序周围有四个大的，白色，瓣状苞片。方法在自然种群中进行传粉昆虫观察和传粉实验，用光谱和化学分析方法表征花序的视觉和嗅觉信号，用双选择行为生物测定法测定传粉昆虫对视觉和嗅觉信号的反应，用生物测定法测定传粉昆虫对视觉和嗅觉信号的反应。通过比较传粉昆虫对三种不同的授粉方式的反应，检验了视觉和嗅觉线索在传粉昆虫吸引中的相对作用。实验处理（完整的，所有苞片去除，和头状花序去除）在自然群体内。重要发现对于坐果，C. capitata完全依赖于传粉者，有一种蜜蜂，Anthophora sp.，是主要的传粉者。B类表现出与叶子的高色距和绿色对比。在花香中检测到12种挥发性化合物，其中大部分以前曾被报道对广谱蜜蜂物种有吸引力。B引诱生物测定表明，单独的视觉线索和单独的嗅觉线索都对传粉蜜蜂有吸引力。然而，视觉线索单独吸引更多的方法比单独的嗅觉线索，而单独的嗅觉线索引起了显着更高的着陆百分比比单独的视觉线索。这一发现表明，在C.在capitata- Anthophora sp.相互作用中，视觉线索主要用于从长距离定位，而嗅觉线索主要帮助从短距离着陆。我们的研究结果表明，不同形式的花的线索，应考虑在一起，以充分了解开花植物和传粉者之间的通信。
Aims i t is generally accepted that visual displays and floral scent play important roles in communication between flowering plants and their pollinators. However, the relative role of visual and olfactory cues in pollinator attraction is largely unknown. i n this study, we determined the roles of both types of cue in attracting pollinators to Cornus capitata, a medium sized tree with each capitulum sur rounded by four large, white, petaloid bracts. Methods Pollinator observations and pollination experiments were conducted in a natural population; the inflorescences’ visual and olfactory signals were characterized by spectral and chemical analyses; the responses of pollinators to visual and olfactory cues were tested using dual-choice behavioural bioassays; the relative roles of visual and olfactory cues in pollinator attraction were tested by comparing the responses of pollinators to inflorescences subjected to three experimental treatments (intact, all bracts removed, and capitulum removed) within the natural population. Important Findings For fruit set, C. capitata is entirely dependent on pollinators, with a bee, Anthophora sp., being the main pollinator. b racts present high colour distance and green contrast against the leaves. Twelve volatile compounds in the floral scent were detected, most of which have previously been reported to be attractive to a broad spectrum of bee species. b ehavioural bioassays showed that both, visual cues alone and olfactory cues alone, are attractive to pollinating bees. However, visual cues alone attracted significantly more approaches than olfactory cues alone, while olfactory cues alone elicited a significantly higher landing percentage than visual cues alone. The finding suggests that, in the C. capitata– Anthophora sp. interaction, visual cues are mainly used for location from long distances, while olfactory cues mainly aid landing from short distances. o ur results indicate that different modalities of floral cues should be considered together to understand fully the communication between flowering plant and pollinators.