A larval speciifc OBP able to bind the major female sex pheromone component in Spodoptera exigua (Hübner)

JIN Rong; LIU Nai-yong; LIU Yan; DONG Shuang-lin

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A larval speciifc OBP able to bind the major female sex pheromone component in Spodoptera exigua (Hübner)

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Odorant binding proteins (OBPs) in insects are postulated to solubilize and transport the hydrophobic odorants across the hydrophilic antennal lymph to the olfactory receptors (ORs) located on the dendrite membrane of the sensory neurons. OBPs in adult insects have been intensively reported, but those in larvae are rarely addressed. In our study, a ful-length OBP cDNA, namely SexiOBP13, was cloned by RT-PCR and RACE strategy from the heads of Spodoptera exigua larvae. The quantitative real-time PCR (qPCR) measurement indicated that SexiOBP13 was highly expressed in larval head, but very low in other parts of larva and was not detected in any tissues of adult. The binding afifnities of SexiOBP13 to plant volatiles and female sex pheromone components were measured by competitive binding assays. Interestingly, SexiOBP13 displayed a high binding afifnity (Ki=3.82μmol L–1) to Z9,E12–14:Ac, the major sex pheromone component of S. exigua, while low afifnities to the tested host plant volatiles (Ki>27μmol L–1). The behavioral tests further conifrmed that Z9,E12–14:Ac was indeed active to elicit the behavioral activity of the third instar larvae of S. exigua. Taken together, our results suggest that SexiOBP13 may play a role in reception of female sex pheromone in S. exigua larvae. The ecological signiifcance of the larvae preference to the adult female sex pheromone was discussed.

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《农业科学学报（英文版）》 |2015年第7期|1356-1366|共11页
作者
JIN Rong; LIU Nai-yong; LIU Yan; DONG Shuang-lin;
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作者单位

Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education/Col ege of Plant Protection, Nanjing Agricultural University, Nanjing 210095, P.R.China;

Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education/Col ege of Plant Protection, Nanjing Agricultural University, Nanjing 210095, P.R.China;

Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education/Col ege of Plant Protection, Nanjing Agricultural University, Nanjing 210095, P.R.China;

Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education/Col ege of Plant Protection, Nanjing Agricultural University, Nanjing 210095, P.R.China;

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A larval speciifc OBP able to bind the major female sex pheromone component in Spodoptera exigua (Hübner)

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