数字农科院2.0

Fungal diversity, pathogenicity, and fungicide sensitivity in leaf diseases of Chinese cabbage from Heilongjiang Province, China

文献类型： 外文期刊

作者： Shuo Wang a; Siqi Ma a; Yiwen Wang a; Xilang Yang a; Chenyang Jiao a; Chunbo Yang a;Xuemeng Wang a;c; Xiangjing Wang a; Wensheng Xiang a;b;*; Junwei Zhao a;b;**

关键词： Chinese cabbage Fungi Fungicide sensitivityLeaf diseasePathogenicity

期刊名称： PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY

ISSN： 0885-5765

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Chinese cabbage (Brassica rapa subsp. pekinensis) is an economically important vegetable in China. In recentyears, climate change has led to a notable increase in leaf diseases of Chinese cabbage in Heilongjiang province.Effective control of these diseases requires accurate pathogen identification and the development of appropriateprevention and management strategies. Fungal pathogens were isolated from diseased leaves collected from 17regions in Heilongjiang province, yielding a total of 111 isolates classified into 16 genera and 20 species based onmorphological characteristics and multi-locus phylogenetic analysis (ITS, GAPDH, RPB2, HIS3, TEF, and/or LSU).Pathogenicity tests revealed that 12 species could cause Chinese cabbage leaf diseases: Alternaria tenuissima(34.2 %), Pithomyces chartarum (9.9 %), Fusarium verticillioides (9.0 %), Scopulariopsis brevicaulis (7.2 %), Alternaria alternata (6.3 %), Nigrospora oryzae (5.4 %), Epicoccum layuense (5.4 %), Fusarium proliferatum (3.6 %),Fusarium acuminatum (3.6 %), Nothophoma quercina (0.9 %), Periconia byssoides (0.9 %), and Curvularia lunata(0.9 %). Among these, A. tenuissima exhibited the highest virulence, with an average disease index of 67.1,followed by Pi. chartarum at 65.1. The optimal temperature for mycelial growth, sporulation, conidia germination, and pathogenicity of the A. tenuissima isolate NNCBC-1-3 was 25 ◦C, whereas both higher and lowertemperatures inhibited these processes. Conidial germination was markedly slowed below 20 ◦C, while conidiainfection occurred between 20 and 25 ◦C. In vitro fungicide assays indicated that 75 % trifloxystrobintebuconazole was the most effective fungicide against A. tenuissima (EC50 = 1.2002 mg/L), while 50 % iprodione showed an EC50 of 0.6479 mg/L against Pi. chartarum. These findings provide an important theoreticalfoundation for managing leaf diseases in Heilongjiang province, emphasizing the significance of species-specificidentification, and offer valuable insights for integrated pathogen management strategies.

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