CAJ | 학술논문

嗅觉在天敌昆虫寻找寄主、躲避敌害、交配、转移等行为中发挥关键作用。嗅觉受体是昆虫嗅觉系统中一类重要的功能蛋白。本文选取从中红侧沟茧蜂触角cDNA文库鉴定一个嗅觉受体基因MmedOr2序列片段，采用RACE技术克隆获得中红侧沟茧蜂嗅觉受体基因MmedOr2的全长序列。通过实时荧光定量PCR解析了该基因在中红侧沟茧蜂不同发育阶段、不同组织部位以及交配前后的转录表达谱。结果表明， MmedOr2在触角中特异性表达，且在雌蜂触角中表达量显著高于雄蜂触角。雌、雄蜂羽化后分别在第3 d和第4 d MmedOr2表达量达到最高，该基因转录表达量达到最高后逐渐下降。另外，交配后雌蜂MmedOr2表达量显著下降。根据以上研究结果，我们推测 MmedOr2可能是性信息素受体，在中红侧沟茧蜂寻找配偶等行为中发挥功能。
후각재천활곤충심조기주、타피활해、교배、전이등행위중발휘관건작용。후각수체시곤충후각계통중일류중요적공능단백。본문선취종중홍측구충봉촉각cDNA문고감정일개후각수체기인MmedOr2서렬편단，채용RACE기술극륭획득중홍측구충봉후각수체기인MmedOr2적전장서렬。통과실시형광정량PCR해석료해기인재중홍측구충봉불동발육계단、불동조직부위이급교배전후적전록표체보。결과표명， MmedOr2재촉각중특이성표체，차재자봉촉각중표체량현저고우웅봉촉각。자、웅봉우화후분별재제3 d화제4 d MmedOr2표체량체도최고，해기인전록표체량체도최고후축점하강。령외，교배후자봉MmedOr2표체량현저하강。근거이상연구결과，아문추측 MmedOr2가능시성신식소수체，재중홍측구충봉심조배우등행위중발휘공능。
Olfaction plays a vital role in host-seeking, enemy-defending, mating and immigration in natural enemies. Olfactory receptors are an important class of functional proteins in insect olfactory system. In this study, a sequence fragment of olfactory receptor gene MmedOr2 in Microplitis mediator was identified from the antenna cDNA library, and the full-length sequence of this gene was obtained by using rapid amplification of cDNA ends (RACE). Further, expression profiles of this gene in different tissues along the developmental stages, as well as before and after mating was analyzed using real-time quantitative PCR. It was found that the receptor gene was specifically expressed in antenna, and expression level was significantly higher in female than in male. In female, MmedOr2 expression reached the highest level on the 3rd day after emergence while the highest expression in male appeared on the 4th day after emergence. After peak expression, MmedOr2 expression level declined gradually in both male and female adults. In addition, expression level of MmedOr2 in female adults was notably decreased after mating. According to above findings, we speculate that MmedOr2 may be a sex pheromone receptor and plays an important role in mate-searching.