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Genome-wide characterization and development of simple sequence repeat markers for genetic studies in pomegranate (Punica granatum L.)

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Genome-wide characterization and development of first set of polymorphic Class I SSRs markers in pomegranate (Punica granatum L.) through in silico analysis using the draft genome sequence of pomegranate cv. Dabenzi (296 Mb) as reported by Qin et al. (2017).

Abstract

The availability of the draft genome sequence of pomegranate cv. Dabenzi presents unprecedented opportunities for the development of largescale genomic resources, such as DNA markers for genotyping applications. In this study, we identify a new set of highly polymorphic simple sequence repeat (SSR) markers by targeting the SSR motif lengths of ≥ 24 bp. A total of 1,73,633 SSRs were identified in the 296-Mb pomegranate genome assembly, reflecting an average density of 527.97 SSRs/Mb. Of these, 43,853 SSRs belong to Class I category (> 20 bp). Concerning the abundance of repeat types in the current dataset, dinucleotide (NN) repeats (31.19%) were the dominant class among all SSRs identified in the genome, followed by tetranucleotide (NNNN: 20.5%) and trinucleotide repeats (NNN: 16.8%). The top two SSR motifs in NN category were AT/AT (64.90%) and AG/CT (28.51%), whereas AAT/ATT (34.66%) and AAG/CTT (28.91%) were the most abundant among NNN repeats. Primer pairs were designed for a total of 2856 Class I SSRs and 110 primers were then assayed initially on eight pomegranate genotypes for polymorphism survey. Polymorphic fragments were obtained for 82 SSRs (77.36%), of which a subset of 13 informative SSRs was further employed to investigate genetic diversity among 46 pomegranate genotypes. Approaches, such as population structure, cluster and PCA elucidated genetic relationships among 46 diverse pomegranate genotypes. In summary, here we developed the first set of genome-wide SSRs in pomegranate that will serve as a powerful genomic tool for future genetic studies. These SSRs have widespread applications in QTL mapping and marker-assisted selection for breeding.

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Abbreviations

QTL:

Quantitative trait loci

CTAB:

Cetyl-trimethyl-ammonium-bromide

NCBI:

National Centre for Biotechnology Information

UPGMA:

Unweighted pair group method of arithmetic averages

PIC:

Polymorphic information content

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Acknowledgements

The authors are highly grateful to the Indian Council of Agricultural Research (ICAR), New Delhi for extended financial support through ICAR-Notational Research Centre on Pomegranate, Solapur. Authors are also thankful to the Ex-Director of ICAR-NRCP, Solapur Dr. R.K Pal for their encouragement and support to carry out this work.

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Correspondence to Prakash G. Patil.

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The authors declare that they do not have any conflict of interest.

Data archiving statement

This research contains no data that requires submission to a public database. The details of SSRs markers designed and used for validation in this study were listed in supplementary files 1 & 2. All the relevant information on Class I SSR markers designed here will be freely available to any scientist wishing to use them for their research purposes.

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Communicated by Carlson.

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Supplementary file1 (DOCX 53 kb)

Supplementary file2 (XLSX 290 kb)

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Patil, P.G., Singh, N.V., Parashuram, S. et al. Genome-wide characterization and development of simple sequence repeat markers for genetic studies in pomegranate (Punica granatum L.). Trees 34, 987–998 (2020). https://doi.org/10.1007/s00468-020-01975-y

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  • DOI: https://doi.org/10.1007/s00468-020-01975-y

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