湖北农业科学 ›› 2024, Vol. 63 ›› Issue (7): 67-71.doi: 10.14088/j.cnki.issn0439-8114.2024.07.010

• 植物保护 • 上一篇    下一篇

陕西省核桃黑斑病新病原的鉴定及室内药剂筛选

雷琼1, 林鑫2, 王文俊3, 屈佳楠3, 张治有3   

  1. 1.杨凌职业技术学院,陕西 杨凌 712100;
    2.陕西省商洛市商州区退耕还林还草中心,陕西 商洛 726000;
    3.中国商洛核桃研究所,陕西 商洛 726000
  • 收稿日期:2024-02-21 出版日期:2024-07-25 发布日期:2024-07-24
  • 作者简介:雷 琼(1977-),女,湖北京山人,副教授,硕士,主要从事植物病理学研究,(电话)13474052493(电子信箱)1148406220@qq.com。
  • 基金资助:
    陕西林业科技创新重点专项(SXLK2022-02-10); 杨凌职业技术学院院内基金项目(ZK 22-48); 陕西省自然科学基金项目(2023-JC-YB-209)

Identification of new pathogen of walnut black spot disease in Shaanxi Province and screening of laboratory agents

LEI Qiong1, LIN Xin2, WANG Wen-jun3, QU Jia-nan3, ZHANG Zhi-you3   

  1. 1. Yangling Vocational & Technical College, Yangling 712100,Shaanxi,China;
    2. Center for Returning Farmland to Forestry and Grassland, Shangluo 726000,Shaanxi,China;
    3. Shangluo Walnut Research Institute of China, Shangluo 726000, Shaanxi,China
  • Received:2024-02-21 Published:2024-07-25 Online:2024-07-24

摘要: 分离田间红仁核桃(Juglans regia ‘Robert Livermore')病叶上的黑斑病病原细菌,通过科赫氏试验明确致病菌,并通过病原菌生化试验以及分子生物学技术明确病原菌的分类学地位。结果表明,从红仁核桃的田间核桃病叶中分离到23株菌落形态一致的细菌菌株,从中随机选取菌株进行科赫氏回接试验能引起红仁核桃叶片发病,通过生理生化表型试验,结合基于16S rDNA、gyrBrpoD基因序列的多位点序列分析,将该病原鉴定为扁桃假单胞菌(Pseudomonas amygdali)。随后对12种药剂进行室内毒力测定,筛选出的6种药剂对该病原菌具有明显抑制作用。其中,四霉素抑菌效果最好,EC50为50.353 4 μg/mL,其他药剂抑菌效果表现为中生菌素>春雷霉素>噻菌酮>噻唑锌>氢氧化铜。

关键词: 红仁核桃(Juglans regia ‘Robert Livermore'), 核桃黑斑病, 扁桃假单胞菌(Pseudomonas amygdali), 新病原, 室内药剂筛选, 陕西省

Abstract: The pathogenic bacteria of black spot disease on the diseased leaves of Juglans regia ‘Robert Livermore' were isolated, and the pathogenic bacteria were identified by Koch's test, and the status of the pathogenic bacteria in taxonomy was determined by pathogen biochemical tests and molecular biology techniques. The results showed that 23 bacterial strains with the consistent colony morphology were isolated from the diseased leaves of the red kernel walnut in the field, and Koch's tieback test was performed on randomly selected strains to cause the disease of red kernel walnut leaves. Through physiological and biochemical phenotype tests, combined with multi-site sequence analysis based on 16S rDNA, gyrB and rpoD gene sequences, the pathogen was identified as Pseudomonas amygdali. Then 12 kinds of agents were tested for indoor toxicity, and 6 agents having an obvious inhibitory effect on the pathogen were screened out. Among them, tetramycin had the best bacteriostatic effect, with an EC50 of 50.353 4 μg/mL, and the bacteriostatic effect of other agents was zhongshengmycin > kasugamycin > thiodiazole-copper > thiazole zinc > copper hydroxide.

Key words: Juglans regia ‘Robert Livermore', walnut black spot disease, Pseudomonas amygdali, new pathogens, screening of laboratory agents, Shaanxi Province

中图分类号: