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甘草内生真菌的群落结构、空间分布、多样性及功能特征分析

Community structure, spatial distribution, diversity and functional characterization of culturable endophytic fungi associated with Glycyrrhiza glabra L.

机构信息

Microbial Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu (J&K), 180001, India; Academy of Scientific and Innovative Research, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu (J&K), 180001, India.

Plant Biotechnology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu (J&K), 180001, India.

出版信息

Fungal Biol. 2019 May;123(5):373-383. doi: 10.1016/j.funbio.2019.02.003. Epub 2019 Feb 18.

Abstract

A total of 266 endophytic fungal isolates were recovered from 1019 tissue segments of Glycyrrhiza glabra collected from four different locations in the North-Western Himalayas. The endophytes grouped into 21 genera and 38 different taxa. The host had strong affinity for the genus Phoma, followed by Fusarium. The species richness was highest at the sub-tropical location, followed by the sub-temperate location and the temperate locations, respectively. The tissue specificity of endophytes was also evident. Some endophytes showed potential antimicrobial activity against phyto-pathogens indicating that they may be helpful to the host in evading pathogens. All the endophytic taxa produced the plant growth promoting hormone, indole acetic acid (IAA), though in varying concentrations. None of these endophytes caused any symptoms of disease in co-cultivation with the tissue cultured plants. Further, all the endophytes had a positive influence on the phenolic and flavonoid content of the host. Three endophytes, Stagonosporopsis cucurbitacearum, Bionectria sp. and Aspergillus terreus also increased the host root (rhizome) and shoot growth visibly. Such endophytes are potential candidates for developing endophyte-based technologies for sustainable cultivation and enhanced productivity of G. glabra. This is the first report of community structure and biological properties of fungal endophytes associated with G. glabra.

摘要

从喜马拉雅山西北部四个不同地点采集的 1019 个甘草组织段中,共分离到 266 株内生真菌。内生真菌分为 21 属和 38 个不同的分类单元。宿主对 Phoma 属有很强的亲和力,其次是 Fusarium 属。亚热带地区的物种丰富度最高,其次是亚温带和温带地区。内生真菌的组织特异性也很明显。一些内生真菌对植物病原菌表现出潜在的抗菌活性,表明它们可能有助于宿主逃避病原体。所有内生真菌都产生了植物生长促进激素吲哚乙酸(IAA),尽管浓度不同。这些内生真菌在与组织培养植物共培养时都没有引起任何疾病症状。此外,所有内生真菌都对宿主的酚类和类黄酮含量有积极影响。三种内生真菌,即瓜亡革菌(Stagonosporopsis cucurbitacearum)、棒孢腔菌(Bionectria sp.)和土曲霉(Aspergillus terreus),也明显促进了宿主的根(根茎)和芽的生长。这些内生真菌是开发基于内生菌的可持续种植和提高甘草生产力的内生菌技术的潜在候选者。这是首次报道与甘草相关的内生真菌的群落结构和生物学特性。

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