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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (5): 1502-1520.doi: 10.16420/j.issn.0513-353x.2025-0509

• Plant Protection • Previous Articles     Next Articles

Identification of Black Spot Pathogen in Cabbage,Analysis of Biological Characteristics,and Screening of Resistant Germplasm Resources

WANG Caihong1, ZHANG Yangyong2, LI Sen1, ZHANG Chaowen1, KONG Xiaoping3, LÜ Honghao2, WANG Yong2, YANG Limei2, JI Jialei2,*(), ZHUANG Mu2,*()   

  1. 1 College of HorticultureShanxi Agricultural University,Taigu, Shanxi 030801, China
    2 State Key Laboratory of Vegetable BiobreedingInstitute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences, Beijing 100081, China
    3 Xining Vegetable Technology Service Center, Xining 810016, China
  • Received:2025-09-28 Revised:2025-12-19 Online:2026-05-26 Published:2026-05-26
  • Contact: JI Jialei, ZHUANG Mu

Abstract:

Black spot disease is one of the major constraints in cabbage production. Multiple black spot disease samples were collected from five major cabbage production regions Beijing,Chongqing,Hubei,Sichuan,and Inner Mongolia. After isolation and purification,30 strains of the pathogen were obtained. Morphological characteristics of the colonies,conidia,and conidial chains of the pathogen were observed and described. Pathogenicity tests conducted using mycelial plug inoculation identified the BJA1 strain from Beijing as the most virulent. Molecular identification through cloning and phylogenetic analysis of the ITSTEF1,and GAPDH genes confirmed that BJA1 is a typical strain of Alternaria brassicicola. Using this strain,an efficient and stable in vitro inoculation system for evaluating resistance to cabbage black spot disease was established. The optimal spore concentration for inoculation was determined to be 1 × 105 spores · mL-1,and the ideal plant growth stage for inoculation was the four-leaf stage. This system was applied to evaluate the resistance of 100 cabbage germplasms to black spot disease,leading to the identification of 24 moderately resistant accessions and one resistant accession with a disease index of 25.93.

Key words: cabbage, black spot disease, Alternaria brassicicola, resistance evaluation, resistant source screening