Electrophysiological and behavioral responses of Asian and European honeybees to pear flower volatiles

文献类型： 外文期刊

第一作者： Ma, Weihua

作者： Ma, Weihua;Wang, Yi;Shen, Jinshan;Li, Jie;Long, Denglong;Li, Xinyu;Su, Wenting;Jiang, Yusuo;Huang, Jiaxing

作者机构：

关键词： Volatiles; Apis cerana cerana Fabricius; Apis mellifera ligustica Spinola; electroantennography (EAG); Olfactory behavior

期刊名称：JOURNAL OF ASIA-PACIFIC ENTOMOLOGY （ 影响因子：1.101； 五年影响因子：1.1 ）

ISSN： 1226-8615

年卷期： 2021 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Honeybee pollination behavior is influenced by flower volatiles, which honeybees sense via olfactory receptors. Honeybees are only weakly attracted to pear flowers. To investigate the potential reasons, we extracted and determined the floral volatile compounds from three pear cultivars (Su, Ya, and Xuehua) using headspace solid-phase micro-extraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). The effects of pear flower volatiles on the Asian honeybee (Apis cerana cerana Fabricius) and the European honeybee (Apis mellifera ligustica Spinola) were determined by electroantennogram (EAG) assays and behavioral tests in a three-arm olfactometer. Among the 76 flower volatiles detected with GC-MS, 21 were found in all three pear cultivars, accounting for approximately 70% of the total volatile content. 3-Methyl-1-butanol and (+)-limonene volatiles had the highest relative content. Five compounds elicited strong EAG responses in both bee species: 2-methylbutyraldehyde, 1-nonanal, 6-methyl-5-hepten-2-one, 3-methyl-1-butanol, and (+)-limonene. Neither bee species showed positive taxis to these volatiles. In behavioral tests, A. mellifera ligustica showed a low preference for 6-methyl-5-hepten-2-one (20%, 400 mu g/mu L) and 2-phenethyl alcohol (16.7%, 400 mu g/mu L). Apis cerana cerana showed a low preference for 6-methyl-5-hepten-2-one (6.7%, 400 mu g/mu L) and 1-nonanal (10%, 400 mu g/mu L), whereas its preferences for 3-methyl-1-butanol (43.3%, 400 mu g/mu L) and alpha-farnesene (40%, 400 mu g/mu L) were similar to that for the control. Therefore, a lack of attractive volatile compounds could explain why honeybees are only weakly attracted to pear flowers. Therefore, to achieve acceptable pollination in pear orchards, we suggest using flower-scent sugar syrup feeding and a saturation pollination strategy.

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