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Defective RNA of a Novel Mycovirus with High Transmissibility Detrimental to Biocontrol Properties of Trichoderma spp.

文献类型： 外文期刊

作者： You, Jiaqi 1 ; Zhou, Kang 1 ; Liu, Xiaolin 1 ; Wu, Mingde 1 ; Yang, Long 1 ; Zhang, Jing 1 ; Chen, Weidong 4 ; Li, Guoqin 1 ;

作者机构： 1.Huazhong Agr Univ, State Key Lab Agr Microbiol, Wuhan 430070, Hubei, Peoples R China

2.Huazhong Agr Univ, Key Lab Plant Pathol Hubei Prov, Wuhan 430070, Hubei, Peoples R China

3.Shanghai Acad Agr Sci, Hort Res Inst, Shanghai 201106, Peoples R China

4.Washington State Univ, ARS, USDA, Pullman, WA 99164 USA

关键词： biological control; Trichoderma spp.; hypovirus; Botrytis cinerea

期刊名称：MICROORGANISMS （ 影响因子：4.128； ）

ISSN：

年卷期： 2019 年 7 卷 11 期

页码：

收录情况： SCI

摘要： Trichoderma species are a group of fungi which is widely distributed in major terrestrial ecosystems; they are also commonly used as biocontrol agents for many plant diseases. A virus, namely Trichoderma harzianum hypovirus 1 (ThHV1), was identified in T. harzianum isolate T-70, and also infected isolate T-70D, together with its defective RNA (ThHV1-S). The ThHV1 genome possessed two Open Reading Frames (ORFs), namely ORF1 and ORF2. The start codon of ORF2 overlapped with the stop codon of ORF1 in a 43 nt long region. The polypeptide encoded by ORF2 of ThHV1 shared sequence similarities with those of betahypoviruses, indicating that ThHV1 is a novel member of Hypoviridea. Isolate T-70D, carrying both ThHV1 and ThHV1-S, showed abnormal biological properties, notably a decreased mycoparasitism ability when compared with isolate T-70. Both ThHV1 and ThHV1-S could be vertically transmitted to conidia and horizontally transmitted to T. harzianum isolate T-68 and T. koningiopsis T-51. The derivative strains carrying both ThHV1 and ThHV1-S showed decreased mycoparasitism ability, whereas strains carrying ThHV1 alone were normal, indicating that ThHV1-S is closely associated with the decreased mycoparasitism ability of T. harzianum isolate T-70D. ThHV1 was widely detected in isolates of T. harzianum, T. koningiopsis and T. atroviride originating from soil of China. Therefore, viruses in fungal biocontrol agents may also be a factor associated with the stability of their application.

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