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Spiralin Diversity Within Iranian Strains of Spiroplasma citri

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Abstract

The first-cultured and most-studied spiroplasma is Spiroplasma citri, the causal agent of citrus stubborn disease, one of the three plant-pathogenic, sieve-tube-restricted, and leafhopper vector-transmitted mollicutes. In Iranian Fars province, S. citri cultures were obtained from stubborn affected citrus trees, sesame and safflower plants, and from the leafhopper vector Circulifer haematoceps. Spiralin gene sequences from different S. citri isolates were amplified by PCR, cloned, and sequenced. Phylogenetic trees based on spiralin gene sequence showed diversity and indicated the presence of three clusters among the S. citri strains. Comparison of the amino acid sequences of eleven spiralins from Iranian strains and those from the reference S. citri strain GII-3 (241 aa), Palmyre strain (242 aa), Spiroplasma kunkelii (240 aa), and Spiroplasma phoeniceum (237 aa) confirmed the conservation of general features of the protein. However, the spiralin of an S. citri isolate named Shiraz I comprised 346 amino acids and showed a large duplication of the region comprised between two short repeats previously identified in S. citri spiralins. We report in this paper the spiralin diversity in Spiroplasma strains from southern Iran and for the first time a partial internal duplication of the spiralin gene.

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Acknowledgments

The authors thank Marie Pierre Dubrana for technical support for drawing the figures and Pascal Sirand-Pugnet for helpful discussions concerning the phylogenetic analyses.

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Authors and Affiliations

  1. Plant Virology Research Centre (PVRC), College of Agriculture, Shiraz University, Shiraz, Iran

    Amin Khanchezar & Keramat Izadpanah

  2. UMR 1332 Biologie du Fruit et Pathologie, INRA, Villenave d’Ornon, France

    Laure Béven & Colette Saillard

  3. UMR 1332 Biologie du Fruit et Pathologie, Univ. Bordeaux, Villenave d’Ornon, France

    Laure Béven & Colette Saillard

  4. Fars Agricultural and Natural Resources Research Center, Zarghan, Iran

    Mohammad Salehi

Authors
  1. Amin Khanchezar
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  2. Laure Béven
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  3. Keramat Izadpanah
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  4. Mohammad Salehi
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  5. Colette Saillard
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Corresponding author

Correspondence to Colette Saillard.

Additional information

Nucleotide sequence data reported for Shiraz I spiralin are available in the GenBank data base under the Accession Number JN860712.

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Khanchezar, A., Béven, L., Izadpanah, K. et al. Spiralin Diversity Within Iranian Strains of Spiroplasma citri . Curr Microbiol 68, 96–104 (2014). https://doi.org/10.1007/s00284-013-0437-z

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