河南农业科学 ›› 2022, Vol. 51 ›› Issue (3): 104-111.DOI: 10.15933/j.cnki.1004-3268.2022.03.012

• 植物保护 • 上一篇    下一篇

楸树茎腐病致病菌的分离鉴定及不同楸树材料抗病性差异

杨潇1,2,王曙光1,梁慎2,娄长城2,王利民2,师曼2,张和臣2   

  1. (1.西南林业大学生命科学学院,云南 昆明 650224;2.河南省农业科学院园艺研究所,河南 郑州 450002)
  • 收稿日期:2021-12-06 出版日期:2022-03-15 发布日期:2022-05-23
  • 通讯作者: 王曙光(1979-),男,山东烟台人,教授,博士,主要从事林木植物研究。E-mail:stevenwang1979@126.com
  • 作者简介:杨潇(1991-),男,河南郑州人,在读硕士研究生,研究方向:植物病害生理。E-mail:466085056@qq.com
  • 基金资助:
    国家自然科学基金项目(32060379)

Isolation and Identification of the Pathogen of Catalpa bungei Stem Rot and Differences in Disease Resistance of Different Catalpa Species

YANG Xiao1,2,WANG Shuguang1,LIANG Shen2,LOU Changcheng2,WANG Limin2,SHI Man2,ZHANG Hechen2   

  1. (1.College of Life Science,Southwest Forestry University,Kunming 650224,China;2.Horticultural Research Institute,Henan Academy of Agricultural Sciences,Zhengzhou 450002,China)
  • Received:2021-12-06 Published:2022-03-15 Online:2022-05-23

摘要: 为明确楸树茎腐病的致病原因,了解不同楸树材料对致病菌的抗性差异,采用组织分离法从感病楸树植株中分离纯化菌株并验证其致病性,之后进行形态与分子鉴定,采用离体叶片穿刺法和浸根法将致病菌接种至不同楸树材料,测定不同楸树材料叶片β-1,3-葡聚糖酶、超氧化物歧化酶(SOD)、过氧化物酶(POD)的活性变化。结果表明,楸树茎腐病的病原菌为露湿漆斑菌(Myrothecium roridum)。在离体叶片穿刺试验中,洛楸1号(CL1)病情指数最低,为39.17;在浸根法试验中,金丝楸(CJS)病情指数最低,为26.67。3个楸树材料中,CJS的β-1,3-葡聚糖酶活性变化最快,其活性峰值比CL1高14.89%,比豫楸2号与灰楸的杂交种(CZ2)高7.12%;CL1的SOD活性上升最快;CL1和CJS的POD活性分别在第3天和第6天达到峰值,且CJS的峰值比CL1高11.11%,比CZ2高25.00%。综合病情指数和酶活性变化,CJS对茎腐病的抗性更强。

关键词: 楸树, 茎腐病, 病原菌鉴定, 抗病性

Abstract: In order to clarify the pathogenic cause of Catalpa bungei stem rot,and to understand the differences in resistance of different Catalpa species to the pathogen,fungi strains were isolated and purified from the diseased Catalpa tree plants by tissue separation method to verify their pathogenicity,and then morphological and molecular identification was carried out. The pathogen was inoculated into different Catalpa species by in vitro leaf puncture method and root dipping method,and activity changes of β⁃1,3⁃glucanase,superoxide dismutase and peroxidase were measured.The results showed that the pathogen of Catalpa bungei stem rot was Myrothecium roridum.In the in vitro leaf puncture test,the disease index of Catalpa bungei Luoqiu 1(CL1)was the lowest,which was 39.17.In the root dipping test,the disease index of Catalpa bungei var. Jinsi(CJS)was the lowest,which was 26.67.Among thethree Catalpa species,the β⁃1,3⁃glucanase activity of CJS changed the fastest,and its peak activity was 14.89% higher than that of CL1 and 7.12% higher than a hybrid of Catalpa bungei Yuqiu 2 and Catalpa fargesii Bur.,which was called CZ2.The SOD activity of CL1 increased the fastest. The POD activities of CL1 and CJS reached their peaks on the 3rd and 6th days respectively,and the peak value of CJS was 11.11% higher than that of CL1 and 25.00% higher than that of CZ2.By comprehensive consideration of disease index and enzyme activity changes,CJS was more resistant to stem rot.

Key words: Catalpa bungei, Stem rot, Pathogen identification, Disease resistance

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