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Current Microbiology

, Volume 74, Issue 7, pp 877–884 | Cite as

Variation of rDNA Internal Transcribed Spacer Sequences in Rhizoctonia cerealis

  • Lei Ji
  • Chunju Liu
  • Li Zhang
  • Aixin Liu
  • Jinfeng Yu
Review Article

Abstract

Fifty-four single protoplast isolates (SPIs) were regenerated from three Rhizoctonia cerealis strains. A total of 169 rDNA-ITS regions were cloned and sequenced from these 54 SPIs. Variations in the ITS1 and ITS2 regions that flank the 5.8S gene were found within clones from the same strain, as well as within clones from the same SPI. These include variations in GC content and ITS length, and single-nucleotide polymorphisms (SNPs). The different strains and SPIs GC contents range from 40.25 to 41.74% and from 42.40 to 45.02%, in the ITS1 and ITS2 regions, respectively. All SNPs occur in the ITS1 and ITS2 regions, with 3–6 and 4–6 polymorphic sites in each region, respectively, in the different strains. SNP variation is relatively stable within the same strain. For example, the 89 ITS sequences generated from isolate WK-207, regardless of SPI or clone, predominantly cluster into two separate clades on a phylogenetic tree, suggesting that nuclei genetic heterogeneity is related to ITS variation in R. cerealis. Although rDNA-ITS sequences from the three strains and different SPIs are somewhat variable, all of our ITS sequences cluster together in anastomosis subgroup AG-DI during phylogenetic analysis. The ITS variation we observed does not negatively influence R. cerealis anastomosis group or subgroup classification.

Keywords

Rhizoctonia cerealis rDNA-ITS sequence Variation Protoplast preparation 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation, China, (Grant No. 30870007), and Shandong Province modern agricultural industry technology system innovation team building special funds (Grant No. SDAIT-01-09).

Funding

Note that the funders of this research had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

284_2017_1258_MOESM1_ESM.docx (391 kb)
Supplementary material 1 (DOCX 390 kb)

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Department of Plant PathologyShandong Agriculture UniversityTaianChina
  2. 2.Shandong Gaomi Tobacco Monopoly BureauGaomiChina

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