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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2022, Vol. 44 ›› Issue (6): 1341-1348.doi: 10.19802/j.issn.1007-9084.2021299

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Differences in conidia of peanut web blotch pathogen and its pathogenicity analysis

Shao-jian LI1(), Meng GAO1, Na WANG1, Wan-wan FAN1, Su-ling SANG1, Guang YANG2, Hang-yu LI2, Xiao-wei CUI1, Zhen-yu WANG1()   

  1. 1.Henan Key Laboratory of Crop Pest Control, Key Laboratory of Integrated Pest Management on Crops in Southern Region of North China, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
    2.Xinyang Academy of Agricultural Sciences, Xinyang 464000, China
  • Received:2021-12-01 Online:2022-12-25 Published:2022-11-24
  • Contact: Zhen-yu WANG E-mail:lishaojianli@126.com;wangzy21@163.com

Abstract:

Peanut web blotch, caused by Didymella arachidicola (also known as Phoma arachidicola or Peyronella arachidicola), is occurring in all major peanut-producing regions. It becomes one of the most challenging leaf diseases of peanut in China currently. To identify the strains for resistant peanut breeding, pathogens were isolated from peanuts from different regions. Results indicated that isolate YY187 showed the shortest sporulation duration. The YY187 strain produced conidia after 7 d on oatmeal agar medium under dark condition of 22°C. Moreover, isolates YY187 and NY206 produced significantly more pycnidia than others. By inoculating peanut leaves with spore suspension, all the 18 tested isolates led to leaf disease, among which LY128 and YY187 had relatively strong pathogenicity. According to comprehensive evaluation, YY187 performed higher sporulation efficiency and stronger pathogenicity which makes it an appropriate model isolate for further studies of peanut web blotch.

Key words: peanut web blotch, Didymella arachidicola, conidia, sporulation efficiency, pathogenicity

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