Staurosporine from the endophytic Streptomyces sp strain CNS-42 acts as a potential biocontrol agent and growth elicitor in cucumber

文献类型： 外文期刊

第一作者： Xiao, Lie

作者： Xiao, Lie;Zhang, Bo;Zhang, Xiaoping;Li, Xiaolin;Zheng, Linyong;Gan, Bingcheng;Huang, Pei;Wang, Qian;Liu, Miaomiao;Bolla, Krishna;Liu, Xueting;Zhang, Lixin;Huang, Pei;Wang, Qian;Liu, Xueting

作者机构：

关键词： Chinese medicinal plants; Endophytic actinobacteria; Antimicrobial activity; Plant growth promoter; Biocontrol; Cucumber; Staurosporine

期刊名称：ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY （ 影响因子：2.271； 五年影响因子：2.707 ）

ISSN： 0003-6072

年卷期： 2014 年 106 卷 3 期

页码：

收录情况： SCI

摘要： Chinese medicinal plants and their surrounding rhizospheric soil serve as promising sources of actinobacteria. A total of 180 actinobacteria strains were isolated from the rhizosphere soil, leaves, stems, and roots of nine selected plants and have been identified as potential biocontrol agents against Fusarium oxysporum f. sp. cucumerinum. An endophytic strain CNS-42 isolated from Alisma orientale showed the largest zone of inhibition demonstrating a potent effect against F. oxysporum f. sp. cucumerinum and a broad antimicrobial activity against bacteria, yeasts, and other pathogenic fungi. The in vivo biocontrol assays showed that the disease severity index was significantly reduced (P < 0.05), and plant shoot fresh weight and height increased greatly (P < 0.05) in plantlets treated with strain CNS-42 compared to the negative control. This isolate was identified as Streptomyces sp. based on cultural, physiological, morphological characteristics, and 16S rRNA gene analysis. Further bioassay-guided isolation and purification revealed that staurosporine was responsible for its antifungal and plant growth promoting activities and the latter property of staurosporine is reported for the first time. The in vivo assay was further performed and indicated that staurosporine showed good growth promoting effect on the plant shoot biomass of cucumber. This is the first critical evidence identifying CNS-42 as a biocontrol agent for the soil borne pathogen, F. oxysporum f. sp. cucumerinum.

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