Abstract
2011年初於國外進口之百合種球首次以核酸檢測法檢出一種屬於Potexvirus之病毒核酸片段,由核酸序列鑑定確認其為國外已報告之車前草嵌紋病毒(Plantago asiatica mosaic virus;PlAMV)。進一步依據GenBank上已登錄之PlAMV核酸序列,設計可增幅全長度鞘蛋白基因序列之引子對PlAMV-cpup(5'-CCGCGGCCGCCACACTACTC)及PlAMV-cpdw(5'-GGCCCACCAGACTTTCACT),針對進口百合種球之罹病組織(代號LV1)之全量核酸進行RT-PCR檢測,可增幅出預估933bp之核酸片段產物,此核酸片段進一步選殖與定序結果,證實其帶有PlAMV之全長度鞘蛋白基因,且與GenBank上已登錄之PlAMV病毒(accession no. AB360794.1)之鞘蛋白胺基酸序列相同度高達93%以上。利用細菌表現蛋白系統所生成之PlAMV-LV1鞘蛋白作為抗原進行抗血清製備,所製備出之PlAMV-LV1多元抗體可成功應用於Indirect ELISA(Indirect enzyme-linked immunosorbent assay)及西方轉漬法(western blotting)等血清檢定法而專一性地檢出此病毒,並發現以直接組織轉漬法(direct tissue blotting;DTB)於植株不同部位組織上對此百合病毒的檢出率均顯著高於用ELISA檢測的結果;植株地下部之病毒檢出率,由根系檢出者顯著地高於由種球鱗片檢出者。運用PlAMV-cpup/PlAMV-cpdw引子對,可應用於不同品系百合的PlAMV CP之RT-PCR檢測。由上述結果顯示,本研究所開發之PlAMV血清與核酸檢測試劑,可應用於百合之PlAMV檢定,尤其DTB法為一種可有效地提升百合檢出PlAMV的血清檢定方式。
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