Abstract Phytophthora capsici is a phytopathogen causing a destructive pepper blight. To control this disease, 77 isolates of Trichoderma spp. were isolated from rhizosphere soil and 15 isolates showed high antagonistic activity. Based on the analysis of the rDNA internal transcribed spacers (ITS), translation elongation factor 1-α (TEF1) and RNA polymerase II subunit B (RPB2) gene sequence data and morphological traits, the isolates were identified as T. brevicompactum, T. atroviride, T. afroharzianum, T. koningiopsis, T. citrinoviride, T. asperellum, T. harzianum, T. virens and a new species. A new species was described as T. dorothopsis. The in vitro antagonistic assay and analysis of metabolite fractions indicate that the T. virens HZA14 could cause colony collapse and degradation of P. capsici. A high activity compound was identified as gliotoxin by spectrometric analysis. The biocontrol tests demonstrated that the T. virens HZA14 delayed the occurrence of chili pepper blight and significantly reduced the disease incidence and severity by 62.64% and 64.20%, respectively. Hence isolate HZA14 could be considered for developing potential biocontrol agent for management of P. capsici in pepper.

中文翻译：

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一种新的木霉属和胶质毒素作用：增强 T. virens 对辣椒上辣椒疫霉的生物防治潜力的新观察

摘要 辣椒疫霉是一种引起破坏性辣椒疫病的植物病原体。为了控制这种疾病，77 株木霉属。从根际土壤中分离到 15 个分离株，显示出高拮抗活性。基于对 rDNA 内部转录间隔区 (ITS)、翻译延伸因子 1-α (TEF1) 和 RNA 聚合酶 II 亚基 B (RPB2) 基因序列数据和形态特征的分析，将分离株鉴定为 T. brevicompactum、T. atroviride, T. afroharzianum, T. koningiopsis, T. citrinoviride, T. asperellum, T. harzianum, T. virens 和一个新物种。一个新物种被描述为 T. dorothopsis。代谢物组分的体外拮抗测定和分析表明，T. virens HZA14 可能导致 P. capsici 的菌落崩溃和降解。通过光谱分析鉴定出一种高活性化合物为胶质毒素。生防试验表明，T. virens HZA14 延迟了辣椒疫病的发生，使病害发生率和严重程度分别降低了 62.64% 和 64.20%。因此，分离 HZA14 可以考虑用于开发潜在的生物防治剂，以管理辣椒中的辣椒。