Archives of Virology

, Volume 163, Issue 6, pp 1449–1454 | Cite as

Host-associated selection of a P3 mutant of zucchini yellow mosaic virus affects viral infectivity in watermelon

  • Baoshan Kang
  • Bin Peng
  • Huijie Wu
  • Lifeng Liu
  • Wanwan Wu
  • Qinsheng Gu
Original Article
  • 124 Downloads

Abstract

In this study, we found that the infectivity of zucchini yellow mosaic virus (ZYMV) in watermelon lines H1 and K6 changed from partial to complete after propagation in the susceptible watermelon line ZXG637. When using cucumber infected with strain ZYMV-CH87 as an inoculum (named ZYMV-CH87C), the mean incidences of infection in lines H1 and K6 were 6% and 11%, respectively. However, when these lines were inoculated with ZXG637 infected with ZYMV-CH87C (named ZYMV-637), 100% of the plants became infected. Sequencing of ZYMV from these different inoculums revealed two nucleotide changes in the P3 cistron in ZYMV-637, which resulted in changes in the amino acids at positions 768 and 857 of the P3 protein, compared with the original strain ZYMV-CH87. We named this variant the M768I857-variant. The M768I857-variant was detected at low levels (3.9%) in ZYMV-CH87C. When ZYMV-CH87C was passaged with ZXG637, the M768I857-variant was selected by the host, and the original sequence was replaced entirely after two passages. These results may be explained by host-associated selection due to an unknown host-encoded factor. Using the M768I857-variant as an inoculum, 100% of the H1 and K6 plants showed systemic symptoms. These results suggest that (1) changing the individual amino acids at the end of the P3 N-terminus induces resistance-breaking, and (2) the P3 N-terminus may be involved in host recognition.

Notes

Acknowledgments

This work was funded by the Central Public-Interest Scientific Institution Basal Research Fund and by the Agricultural Science and Technology Innovation Program.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflicts of interest.

Ethical statements

The work has not been published previously and is not under consideration for publication elsewhere. All authors have agreed to the submission and to the order of their names on the title page; this article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Zhengzhou Fruit Research InstituteChinese Academy of Agricultural SciencesZhengzhouChina

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