Aspergillus nomiae

  • 文章类型: Journal Article
    诺米曲霉被称为感染人类和植物的致病性真菌,但从未被报道为能够提供其他功能作为内型的食虫真菌(EPF)。
    从大豆田中的斜纹夜蛾的患病幼虫中分离并鉴定了EPF菌株,并命名为AnS1Gzl-1。评估了该菌株对各种害虫的致病性,特别是定殖植物并诱导对植物病原体和害虫的抗性的能力。
    分离的EPF菌株AnS1Gzl-1被鉴定为A.nomiae;它对属于鳞翅目和半翅目的五种昆虫害虫显示出强致病性。此外,该菌株在体外抑制了菌核病菌的生长,土传植物病害的病原体。它通过根灌溉以90%的高定殖率将植物定植为内生菌,从而诱导植物对植物病原体感染的抗性,并破坏了斜纹夜蛾幼虫的摄食选择性。
    这是对昆虫自然感染A.nomiae的第一个记录。nomiae具有用作双重生物防治EPF的潜力,因为它不仅能够直接杀死广谱的害虫,而且能够通过植物定植诱导对植物病原体的抗性。
    UNASSIGNED: Aspergillus nomiae is known as a pathogenic fungus that infects humans and plants but has never been reported as an entomophagous fungus (EPF) that can provide other functions as an endotype.
    UNASSIGNED: A strain of EPF was isolated and identified from diseased larvae of Spodoptera litura in a soybean field and designated AnS1Gzl-1. Pathogenicity of the strain toward various insect pests was evaluated, especially the ability to colonize plants and induce resistance against phytopathogens and insect pests.
    UNASSIGNED: The isolated EPF strain AnS1Gzl-1 was identified as A. nomiae; it showed strong pathogenicity toward five insect pests belonging to Lepidoptera and Hemiptera. Furthermore, the strain inhibited the growth of Sclerotinia sclerotiorum in vitro, a causal agent of soil-borne plant disease. It colonized plants as an endophyte via root irrigation with a high colonization rate of 90%, thereby inducing plant resistance against phytopathogen infection, and disrupting the feeding selectivity of S. litura larvae.
    UNASSIGNED: This is the first record of a natural infection of A. nomiae on insects. A. nomiae has the potential to be used as a dual biocontrol EPF because of its ability to not only kill a broad spectrum of insect pests directly but also induce resistance against phytopathogens via plant colonization.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

       PDF(Pubmed)

  • 文章类型: Journal Article
    UNASSIGNED: A 73-year-old female suffering from acute myeloid leukemia presented with progressive rhinofacial mycosis. Suspecting it to be mucormycosis, the antifungal amphotericin B (AMB) was administered empirically, but the patient did not respond as planned. The fungus was then isolated from the biopsied tissue and morphologically identified as a species of Aspergillus. Necrosis progressed and she died of cerebral hemorrhage. Since Aspergillus flavus is susceptible to AMB, and several other Aspergillus species can be misidentified as A. flavus, the observed resistance necessitated a re-examination of the fungal isolate.
    UNASSIGNED: The fungal strain was re-isolated and re-examined morphologically. Additionally, genomic DNA was extracted from the fungus and sequences were obtained from three genomic regions [the rDNA internal transcribed spacer (ITS) region, and portions of the β-tubulin and calmodulin genes] to more accurately identify this Aspergillus strain. Its antifungal susceptibility was assessed using multiple compounds and our findings were compared with literature data.
    UNASSIGNED: The fungal culture again yielded an Aspergillus isolate morphologically identical to A. flavus. Molecular analyses, however, revealed the strain to be A. nomiae, a close relative of A. flavus in section Flavi, and it exhibited resistance to AMB. Reviewing the literature, only five other cases of A. nomiae infection in humans have been reported worldwide.
    UNASSIGNED: The rhinofacial mycosis of the patient was actually due to A. nomiae. The initial misidentification of the fungus, coupled with its resistance to AMB, could be the reason treatment did not help the patient. We postulate that clinical A. nomiae infections may be underreported and that accurate and speedy pathogen identification is important so that an effective antifungal regimen can be administered.
    导出

    更多引用

    收藏

    翻译标题摘要

    我要上传

       PDF(Sci-hub)

       PDF(Pubmed)

公众号