Effects of mating on host selection by female small white butterflies Pieris rapae (Lepidoptera: Pieridae)
Effects of mating on host selection by female small white butterflies Pieris rapae (Lepidoptera: Pieridae)
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DOI：
10.1007/s00359-017-1237-x
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发表时间：
2018-02-01
影响因子：
2.1
通讯作者：
Omura, Hisashi
中科院分区：
文献类型：
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作者：
Itoh, Yuki;Okumura, Yukiko;Omura, Hisashi
交配可能显着影响植食性昆虫的寄主选择行为。在这里，我们研究了菜粉蝶（鳞翅目：粉蝶科）雌性对宿主植物挥发物的行为和触角反应的交配后变化。在使用人造植物模型的二选一生物测定中，交配的雌性比无气味的对照更频繁地访问带有卷心菜植物挥发物的合成混合物（15、9或6种成分）香味的模型，而未交配的雌性则没有表现出这种偏好。由于单一化合物和三组分混合物不会引起优先访问，因此交配的雌性显然利用复杂的气味混合物作为寻找宿主的线索。此外，交配后 2 至 4 天的雌性比未交配的雌性更频繁地拜访模型，无论有气味还是无气味。因此，交配增强了年轻雌性的寄主寻找行为及其对植物挥发物的反应能力。气相色谱-触角电检测器分析表明，卷心菜挥发物中的 15 种化合物中有 8 种能引起雌性触角的反应。然而，没有检测到交配后和年龄相关的触角反应变化。由于雌性外周（触角）对挥发物的敏感性在羽化后实际上保持不变，因此交配后宿主选择的变化可能归因于中枢神经系统的变化。
Mating might significantly affect the host selection behaviors of phytophagous insects. Here, we investigated the post-mating changes in behavioral and antennal responses of Pieris rapae (Lepidoptera: Pieridae) females to host plant volatiles. In two-choice bioassays using artificial plant models, mated females visited the model scented with synthetic blends (15-, 9-, or 6-components) of cabbage plant volatiles more frequently than the unscented control, whereas virgin females did not exhibit this preference. Because single compounds and the 3-component blend did not induce preferential visiting, mated females apparently utilized complex odor blends as their host-finding cue. Moreover, 2- to 4-day-old mated females visited the models, scented and unscented, more frequently than did their virgin counterparts. Therefore, mating enhanced the host-finding behavior of young females and their responsiveness to plant volatiles. Gas chromatography-electroantennographic detector analysis revealed that eight of the 15 compounds in the cabbage plant volatiles elicited responses from female antennae. However, post-mating and age-dependent changes in antennal responses were not detected. Because female peripheral (antennal) sensitivity to volatiles remained practically unchanged after emergence, post-mating changes in host selection might be attributed to changes in the central nervous system.