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    兼抗4种烟草病毒病弱毒疫苗的构建与效果分析

    Construction and Efficacy Analysis of Attenuated Vaccine Against Four Types of Tobacco Virus Diseases

    • 摘要: 为解决单靶标疫苗无法同时防治多种烟草病毒病的现状,以黄瓜花叶病毒Fny株系(Cucumber mosaic virus Fny,CMVFny)为疫苗载体,利用重叠PCR技术在CMVFny RNA2弱毒突变体基础上以不同排列顺序插入TMV、PVY和TVBMV的部分基因组保守片段,构建了6种在本氏烟中交叉保护效果好、遗传稳定,并且对CMV、TMV、PVY和TVBMV 4种病毒均具有一定抗性的重组型病毒。6种重组型病毒对CMV单独侵染的防效均超过87%,对其他3种病毒单独侵染的防效为22.2%~46.2%,对4种病毒混合侵染的防效维持在16%~37%。本研究为烟草病毒病的防治提供了疫苗材料,丰富了植物病毒弱毒疫苗创制的实践。

       

      Abstract: To address the challenge of a single-dose, single-target vaccine being unable control multiple tobacco viral diseases simultaneously, we constructed six recombinant viruses that exhibit strong cross-protection effective, stably existence in Nicotiana benthamiana and simultaneously resistance to CMV, TMV, PVY and TVBMV. These recombinant viruses all used the cucumber mosaic virus Fny (CMVFny) strain as the vaccine vector, with conserved combination fragments of TMV, PVY and TVBMV genomes inserted into the CMVFny RNA2 attenuated mutant in different permutations. The relative control efficacy of the six recombinant viruses exceeded 87% against CMV infecting alone, ranging from 22.2% to 46.2% against single infections of the other three viruses, and from 16% to 37% against mixed infections of all four viruses. This study provides vaccine candidates for controlling tobacco virus diseases and enriches the practice of creating attenuated plant virus vaccines.

       

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