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Population Structure and Genetic Diversity within California Citrus tristeza virus (CTV) Isolates

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Abstract

The Closterovirus, Citrus tristeza virus (CTV) is an aphid-borne RNA virus that is the causal agent of important worldwide economic losses in citrus. Biological and molecular variation has been observed for many CTV isolates. In this work we detected and analyzed sequence variants (haplotypes) within individual CTV isolates. We studied the population structure of five California CTV isolates by single strand conformation polymorphism (SSCP) analysis of four CTV genomic regions. Also, we estimated the genetic diversity within and between isolates by analysis of haplotype nucleotide sequences. Most CTV isolates were composed of a population of genetically related variants (haplotypes), one being predominant. However in one case, we found a high nucleotide divergence between haplotypes of the same isolate. Comparison of these haplotypes with those from other isolates suggests that some CTV isolates could have arisen as result of a mixed infection of two divergent isolates.

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Authors and Affiliations

  1. Central California Tristeza Eradication Agency, Tulare, CA, 93224, USA

    MaryLou Polek & Bryce W. Falk

  2. Department of Plant Pathology, University of California, 1 Shields Avenue, Davis, CA, 95616, USA

    Ping Kong, Luis Rubio & MaryLou Polek

Authors
  1. Ping Kong
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  2. Luis Rubio
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  3. MaryLou Polek
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  4. Bryce W. Falk
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Kong, P., Rubio, L., Polek, M. et al. Population Structure and Genetic Diversity within California Citrus tristeza virus (CTV) Isolates. Virus Genes 21, 139–145 (2000). https://doi.org/10.1023/A:1008198311398

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