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Evolutionary Rates and Phylogeographical Analysis of Odontoglossum Ringspot Virus Based on the 166 Coat Protein Gene Sequences
Plant Pathol. J. 2019;35:498-507
Published online October 1, 2019
© 2019 The Korean Society of Plant Pathology.

Zhen He , Tingting Dong, Weiwen Wu, Wen Chen, Xian Liu, and Liangjun Li*

School of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China
Correspondence to: Phone) +86-514-87979394, FAX) +86-514-87347537
E-mail) ljli@yzu.edu.cn
ORCID
Zhen He
https://orcid.org/0000-0003-2460-1583

Handling Editor : Yoon, Ju-Yeon
Received April 22, 2019; Revised July 10, 2019; Accepted August 19, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Odontoglossum ringspot virus (ORSV) is a member of the genus Tobamovirus. It is one of the most prevalent viruses infecting orchids worldwide. Earlier studies reported the genetic variability of ORSV isolates from Korea and China. However, the evolutionary rate, timescale, and phylogeographical analyses of ORSV were unclear. Twenty-one coat protein (CP) gene sequences of ORSV were determined in this study, and used them together with 145 CP sequences obtained from GenBank to infer the genetic diversities, evolutionary rate, timescale and migration of ORSV populations. Evolutionary rate of ORSV populations was 1.25 × 10−3 nucleotides/site/y. The most recent common ancestors came from 30 year ago (95% confidence intervals, 26-40). Based on CP gene, ORSV migrated from mainland China and South Korea to Taiwan island, Germany, Australia, Singapore, and Indonesia, and it also circulated within east Asia. Our study is the first attempt to evaluate the evolutionary rates, timescales and migration dynamics of ORSV.
Keywords : evolutionary rates, gene flow, migration, Odontoglossum ringspot virus


October 2019, 35 (5)
  • DOAJ
  • ORCID