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柑橘衰退病毒含量对其蚜传效率的影响

, PP. 93-98

Keywords: 柑橘衰退病毒,蚜传能力,病毒含量

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Abstract:

为明确毒源植株和蚜虫中柑橘衰退病毒(Citrustristezavirus,CTV)的发生情况与蚜虫传播CTV能力的关系,将褐色橘蚜、棉蚜、橘二叉蚜和绣线菊蚜置于分别感染了4个CTV分离株的锦橙上取食24h后,运用巢式RT-PCR和实时RT-PCR检测蚜虫和锦橙的带毒情况,并分析蚜虫的传毒能力。结果显示,蚜虫中CTV的平均带毒率为0.76~0.84,其中棉蚜的最高,其次为绣线菊蚜、褐色橘蚜和橘二叉蚜。锦橙中各CTV分离株的含量差异不大,与蚜虫传毒效率间无显著相关性;也未发现蚜虫带毒率与其传播CTV能力之间存在相关性。蚜虫体内CTV的含量为5.36×103±2.33×103~2.01×106±3.67×105拷贝,褐色橘蚜中含量最高,其次为棉蚜、橘二叉蚜和绣线菊蚜;且高蚜传能力CTV分离株在褐色橘蚜体内的含量远高于低蚜传能力分离株。表明蚜虫体内CTV的含量可能与蚜虫传毒能力有关。

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