Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (7): 1449-1456.DOI: 10.3969/j.issn.1004-1524.2022.07.12

• Plant protection • Previous Articles     Next Articles

Identification and main biological characteristics of pathogen of Clematis leaf blight in Yunnan

YANG Ling1,2(), SHA Nanjing2, PAN Pengju2, WU Bozhi1,*()   

  1. 1. College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201,China
    2. Key Laboratory for Forest Biotechnology in Universities of Yunnan Province, Southwest Forestry University, Kunming 650224,China
  • Received:2021-02-23 Online:2022-07-25 Published:2022-07-26
  • Contact: WU Bozhi

Abstract:

In order to identify the pathogen of Clematis leaf blight in Yunnan Province, the typical diseased leaves were collected from the diseased plants. The pathogen was isolated and purified by tissue separation method, and identified by morphological characteristics combined with sequence analysis of ribosomal internal transcribed spacer (ITS) and large subunit (LSU), and verified by Koch postulates. The main biological characteristics of the pathogen were determined with different media, temperature, light, pH, carbon and nitrogen sources. The results showed that the pathogen of Clematis leaf blight was Spencermartinia sp., according to Koch postulates, all the leaves inoculated with the pathogen were infected. Potato dextrose agar (PDA) and potato saccharose agar(PSA) were the suitable media, the optimum temperature for growth was 25 ℃, the growth was not affected under different light treatments, the optimum pH for growth was 6.5-7.5, the best carbon source was glucose and sucrose, and the best nitrogen source was sodium nitrate.

Key words: Clematis leaf blight, pathogen identification, biological characteristics

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