European Journal of Plant Pathology

, Volume 118, Issue 4, pp 333–348 | Cite as

Genetic analysis of an attenuated Papaya ringspot virus strain applied for cross-protection

  • Chu-Hui Chiang
  • Chun-Yee Lee
  • Ching-Hsien Wang
  • Fuh-Jyh Jan
  • Shih-Shun Lin
  • Tsung-Chi Chen
  • Joseph A. J. Raja
  • Shyi-Dong YehEmail author
Full Research Paper


Papaya ringspot virus (PRSV) HA 5-1, a nitrous acid-induced mild mutant of severe strain HA, widely applied for control of PRSV by cross-protection, was used to study the genetic basis of attenuation. Using infectious clones, a series of recombinants was generated between HA 5-1 and HA and their infectivity was analyzed on the systemic host papaya and the local lesion host Chenopodium quinoa. The recombinants that contained mutations in P1 and HC-Pro genes caused attenuated infection on papaya without conspicuous symptoms, similar to HA 5-1. The recombination and sequence analyses strongly implicated two amino acid changes in the C-terminal region of P1 and two in HC-Pro of HA 5-1 involved in the attenuated infection on papaya. The recombinants that infected C. quinoa plants without local lesions contained the same mutations in the C-terminal region of HC-Pro for attenuated infection on papaya. We conclude that both P1 and HC-Pro bear important pathogenicity determinants for the infection on the systemic host papaya and that the mutations in HC-Pro affecting pathogenicity on papaya are also responsible for the inability to induce hypersensitive reaction on C. quinoa.


Attenuated virus Cross-protection In vitro transcription Recombinant virus 



The authors thank Drs. M. J. Chen, S. T. Hsu, and H. T. Hsu for their encouragement and advice. This research was partly supported by the grants NSC 87-2312-B-005-005 and NSC 89-2321-B-005-001 from the National Science Council of the Republic of China on Taiwan.


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Copyright information

© KNPV 2007

Authors and Affiliations

  • Chu-Hui Chiang
    • 1
  • Chun-Yee Lee
    • 2
  • Ching-Hsien Wang
    • 2
  • Fuh-Jyh Jan
    • 2
  • Shih-Shun Lin
    • 2
  • Tsung-Chi Chen
    • 2
  • Joseph A. J. Raja
    • 2
  • Shyi-Dong Yeh
    • 2
    Email author
  1. 1.Department of Molecular BiotechnologyDa Yeh UniversityChang HwaTaiwan
  2. 2.Department of Plant PathologyNational Chung Hsing UniversityTaichungTaiwan

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