The recombinant isolate of cucurbit aphid-borne yellows virus from Brazil is a polerovirus transmitted by whiteflies,Plant Pathology

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The recombinant isolate of cucurbit aphid-borne yellows virus from Brazil is a polerovirus transmitted by whiteflies
Plant Pathology ( IF 2.3 ) Pub Date : 2020-04-23 , DOI: 10.1111/ppa.13186
Thiago M. Costa ₁ , Alice K. Inoue‐Nagata _{2,

3} , Andreza H. Vidal _{1,

4,

5} , Simone da G. Ribeiro _{4,

5} , Tatsuya Nagata _{1,

3}

Affiliation

The severe yellowing disease (amarelao) on melon plants is a serious problem in Brazil, although the causative agent remained unknown for a long time. Recently, recombinant isolates of cucurbit aphid‐borne yellows virus (CABYV) were reported as the possible causative agents of this disease on melon plants. Although aphids are known to be the vectors of the common type of CABYV isolates, almost no aphid colony was observed in the major melon fields in Brazil with high incidence of the severe yellowing disease. In contrast, whiteflies are often abundant. Based on this observation, the hypothesis of the transmission of recombinant CABYV by whiteflies was evaluated. After thorough transmission experiments, we found that this recombinant CABYV isolate was transmitted by the whitefly Bemisia tabaci MEAM1, but not by Aphis gossipii. Furthermore, the host response by whitefly‐based inoculation in cucurbits and other indicator plants showed differences in host range when compared to the common type of CABYV. Due to its transmissibility by the whitefly and the distant relationship of the P3/P5 protein to CABYV, the name “cucurbit whitefly‐borne yellows virus” is proposed for this recombinant CABYV. This is the second report of polerovirus transmission by the whitefly B. tabaci, following the report of pepper whitefly‐borne vein yellows virus.

中文翻译：

巴西葫芦科蚜虫黄病毒重组分离株为粉虱传播的杆状病毒

瓜类植物上的严重黄化病 (amarelao) 在巴西是一个严重的问题，尽管很长一段时间内病原体仍然未知。最近，有报道称葫芦科蚜虫传播的黄色病毒（CABYV）的重组分离株是瓜类植物该病害的可能病原体。虽然已知蚜虫是CABYV分离株常见类型的载体，但在严重黄化病高发的巴西主要瓜田中几乎没有观察到蚜虫集落。相比之下，粉虱通常很丰富。基于这一观察，评估了粉虱传播重组 CABYV 的假设。经过彻底的传播实验，我们发现这种重组 CABYV 分离株是由粉虱 Bemisia tabaci MEAM1 传播的，而不是由八角蚜传播。此外，与常见类型的 CABYV 相比，葫芦和其他指示植物中基于粉虱接种的宿主反应显示出宿主范围的差异。由于粉虱的传播能力以及 P3/P5 蛋白与 CABYV 的远亲关系，建议将此重组 CABYV 命名为“葫芦科粉虱传播的黄色病毒”。这是继胡椒粉虱传播的脉黄病毒报告之后，粉虱 B. 粉虱传播的第二次报告。

更新日期：2020-04-23

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