Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (11): 2336-2346.doi: 10.16420/j.issn.0513-353x.2021-0804

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The Neutral Interaction of Co-infection Papaya Between Papaya Ringspot Virus and Papaya Leaf Distortion Mosaic Virus

MO Cuiping1, WU Zilin2, GUO Yongyi1, ZHANG Shuguang1, LI Pengfei1, LI Huaping1,*()   

  1. 1Guangdong Province Key Laboratory of Microbial Signals and Disease Control,College of Plant Protection,South China Agricultural University,Guangzhou 510642,China
    2Guangdong Sugarcane Genetic Improvement Engineering Center,Institute of Nanfan & Seed Industry,Guangdong Academy of Sciences,Guangzhou 510316,China
  • Received:2022-04-22 Revised:2022-07-15 Online:2022-11-25 Published:2022-11-25
  • Contact: LI Huaping


The commercialized transgenic papaya‘Huanong 1’has been utilized to successfully control the destructive virus-papaya ringspot virus(PRSV)in South China. However,another new emerging virus,papaya leaf distortion mosaic virus(PLDMV)was found in some PRSV-resistant transgenic and other non-transgenic plants in Guangdong and Hainan Provinces through a field investigation. The survey results indicated that the two viruses had co-infections on some papaya plants. To clarify the interrelationship between the two viruses on papaya,the characteristics of both virus incidence,symptoms and cellular pathology,and virus accumulation on transgenic and non-transgenic papaya were analyzed by artificial inoculation. The results showed that the transgenic papaya‘Huanong 1’was still strong resistant to PRSV,but highly susceptible to PLDMV,and PLDMV could not help PRSV overcome its resistance to transgenic papaya. In addition,it was not observed significant symptomatic difference on the transgenic and non-transgenic papaya by the single- or co-infection of two viruses. The virions of the two viruses mostly existed in different mesophyll cells,which were not more seriously damaged with co-infection of two viruses compared with single viral infection. Moreover,the accumulation of PRSV gradually decreased until it was undetectable 15 days post inoculation on the transgenic papaya,while the accumulation of PLDMV gradually increased and remained at a higher level. On transgenic or non-transgenic papaya,the accumulation of PRSV virus was lower than that of PLDMV,but the two viruses co-existed for a long time and each maintained the corresponding viral contents on the non-transgenic papaya. These results indicate that transgenic papaya‘Huanong 1’is highly susceptible to PLDMV,and PRSV and PLDMV were shown as neutral with no synergistic infected in papaya plants.

Key words: Carica papaya, papaya ringspot virus, papaya leaf distortion mosaic virus, co-infection, interaction analysis

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