湖北农业科学 ›› 2025, Vol. 64 ›› Issue (10): 105-109.doi: 10.14088/j.cnki.issn0439-8114.2025.10.016

• 植物保护 • 上一篇    下一篇

条斑紫菜丝状体黄绿斑病病原优势菌分离鉴定及药敏性分析

王卫兵1, 王洪斌2   

  1. 1.江苏省淮安市淮阴区南陈集镇农村工作办公室,江苏 淮安 223341;
    2.江苏海洋大学海洋科学与水产学院,江苏 连云港 222005
  • 收稿日期:2025-06-26 出版日期:2025-10-25 发布日期:2025-11-14
  • 通讯作者: 王洪斌(1966-),男,教授,博士,主要从事海洋微生物研究,(电子信箱)lygwhbly@126.com。
  • 作者简介:王卫兵(1980-),男,江苏淮安人,工程师,主要从事渔业技术指导工作,(电子信箱)285644356@qq.com。
  • 基金资助:
    连云港市“521工程”科研资助项目(LYG06521202129)

Identification and antibiotic susceptibility analysis of the dominant pathogen from filamentous thalli of Pyropia yezoensis with yellow-green spot disease

WANG Wei-bing1, WANG Hong-bin2   

  1. 1. Rural Work Office, Nanchenji Town, Huaiyin District, Huaian, Jiangsu Province, Huaian 223341, Jiangsu,China;
    2. School of Marine Science and Fisheries, Jiangsu Ocean University, Lianyungang 222005,Jiangsu,China
  • Received:2025-06-26 Published:2025-10-25 Online:2025-11-14

摘要: 以连云港市瀚涌水产养殖公司提供的患黄绿斑病的条斑紫菜(Pyropia yezoensis)丝状体样本为试验材料,从中分离获得优势病原菌株ZCX-1,经16S rRNA基因序列比对及系统进化树分析,初步鉴定为Ruegeria arenilitoris。采用滤纸片扩散法开展抗生素药敏试验,并研究不同温度与pH对其抑菌效果的影响。药敏试验结果显示,在9种供试抗生素中,ZCX-1菌株对头孢噻吩具有抗药性;对新霉素、依诺沙星、氨苄西林、头孢呋辛和头孢曲松高度敏感(抑菌圈直径D≥20 mm),其中氨苄西林的敏感程度最高,平均抑菌圈直径最大为33 mm,新霉素最低,平均抑菌圈直径为22.33 mm;对洛美沙星、链霉素和卡那霉素中度敏感(10 mm <D< 20 mm)。温度-pH影响试验表明,氨苄西林在pH 8.0、30 ℃时抑菌效果最佳,抑菌圈直径达38.7 mm;而依诺沙星在pH 7.2、40 ℃时抑菌效果最差,抑菌圈直径仅为10.0 mm。

关键词: 条斑紫菜(Pyropia yezoensis), 丝状体, 黄绿斑病, 药敏分析, Ruegeria arenilitoris, 温度, pH

Abstract: Filamentous thalli of the red alga Pyropia yezoensis exhibiting yellow-green spot disease, provided by Hanyong Aquaculture Company (Lianyungang City), were used as experimental material. The dominant pathogenic isolate, designated ZCX-1, was obtained from these diseased thalli and preliminarily identified as Ruegeria arenilitoris based on 16S rRNA gene sequence comparison and phylogenetic analysis. Antibiotic susceptibility was evaluated by the paper-disc diffusion assay, and the influence of different temperatures and pH values on antibacterial efficacy was investigated. Results of the susceptibility tests showed that among nine tested antibiotics, strain ZCX-1 was resistant to cephalothin; it was highly susceptible to neomycin, enoxacin, ampicillin, cefuroxime, and ceftriaxone (inhibition zone diameter D ≥ 20 mm). Ampicillin exhibited the greatest activity, with a mean inhibition zone diameter of 33 mm, while neomycin produced the smallest mean inhibition zone (22.33 mm). ZCX-1 showed intermediate susceptibility to lomefloxacin, streptomycin, and kanamycin (10 mm < D < 20 mm). Temperature-pH interaction assays indicated that ampicillin achieved the strongest inhibitory effect at pH 8.0 and 30 ℃, with an inhibition zone diameter of 38.7 mm; conversely, enoxacin showed the poorest inhibition at pH 7.2 and 40 ℃, yielding an inhibition zone diameter of only 10.0 mm.

Key words: Pyropia yezoensis, filamentous thalli, yellow-green spot disease, antibiotic susceptibility, Ruegeria arenilitoris, temperature, pH

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