Associative learning of<i>Helicoverpa armigera</i>adults to two key floral odours

Weizheng, 李为争 Li; Qiong, 王琼 Wang; Huiling, 李慧玲 Li; Wang, Jue; Yangyang, 李洋洋 Li; Xianru, 郭线茹 Guo; Guohui, 原国辉 Yuan

doi:10.5846/stxb201308142079

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“…Each odour compound was diluted in hexane, resulting in 0.01 and 0.001 Mol L −1 solutions, and the placement was repeated between six and nine times. Each agar column was mixed with 20 μL of hexane or a volatile compound solution 35 . Containers were rotated 90° clockwise every day.…”

Section: Methodsmentioning

confidence: 99%

“…Each agar column was mixed with 20 μL of hexane or a volatile compound solution. 35 Containers were rotated 90°clockwise every day. The numbers of eggs on each part of the gauze were counted after 72 h, and the oviposition preference index (OPI) was calculated as OPI = (number of eggs in the treatment − number of eggs in the control)/total number of eggs.…”

Section: Egg-laying Assaymentioning

confidence: 99%

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Nonanal modulates oviposition preference in female Helicoverpa assulta (Lepidoptera: Noctuidae) via the activation of peripheral neurons

Wang

Miao

et al. 2020

Pest Management Science

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BACKGROUND The insect olfactory system can recognize odorants for feeding, courtship, oviposition and avoiding natural enemies. Odorant cues from host plants play important roles in insect behaviours. Tobacco ( Nicotiana tabacum ) is the main cultivated host of the oriental tobacco budworm Helicoverpa assult . Volatiles of tobacco plants attract and stimulate oviposition in female moths. However, it is still not known how female H. assulta recognize tobacco volatiles and which odorant compounds are used as oviposition cues. RESULTS We detected 14 volatile compounds emitted from a tobacco plant during vegetative growth, using gas chromatography–mass spectrometry. Electroantennogram tests indicated that eight of the 14 compounds induced responses in female H. assulta. Among these eight volatiles, nonanal greatly increased oviposition preference. Single‐sensillum recording (SSR) results showed that many neurons housed in three types of short basiconic sensilla and four types of long basiconic sensilla responded to nonanal and heptanal as its structural analogue. The responses to nonanal were significantly stronger than those to the other compounds. Nonanal was the main ligand of OR67, an odorant receptor from H. assulta . This was demonstrated using an in vitro Xenopus oocytes expression system that supported the SSR results. CONCLUSION Nonanal is a key signal volatile of tobacco plants that attracts female H. assulta moths to oviposit. © 2020 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Section: Methodsmentioning

confidence: 99%

Section: Egg-laying Assaymentioning

confidence: 99%