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Utility of indels for species-level identification of a biologically complex plant group: a study with intergenic spacer in Citrus

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Abstract

The Consortium of Barcode of Life plant working group proposed to use the defined portion of plastid genes rbcL and matK either singly or in combination as the standard DNA barcode for plants. But DNA barcode based identification of biologically complex plant groups are always a challenging task due to the occurrence of natural hybridization. Here, we examined the use of indels polymorphism in trnH-psbA and trnL-trnF sequences for rapid species identification of citrus. DNA from young leaves of selected citrus species were isolated and matK gene (~800 bp) and trnH-psbA spacer (~450 bp) of Chloroplast DNA was amplified for species level identification. The sequences within the group taxa of Citrus were aligned using the ClustalX program. With few obvious misalignments were corrected manually using the similarity criterion. We identified a 54 bp inverted repeat or palindrome sequence (27–80 regions) and 6 multi residues indel coding regions. Large inverted repeats in cpDNA provided authentication at the higher taxonomic levels. These diagnostics indel marker from trnH-psbA were successful in identifying different species (5 out of 7) within the studied Citrus except Citrus limon and Citrus medica. These two closely related species are distinguished through the 6 bp deletion in trnL-trnF. This study demonstrated that the indel polymorphism based approach easily characterizes the Citrus species and the same may be applied in other complex groups. Likewise other indels occurring intergenic spacer of chloroplast regions may be tested for rapid identification of other secondary citrus species.

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Acknowledgments

We acknowledge Department of Biotechnology, Govt. of India for the infrastructural support and UGC–JRF in Engineering & Technology fellowships to the author (PM).

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Authors and Affiliations

  1. DNA Barcode and Genomics Laboratory, Department of Biotechnology, Assam University, Silchar, 788011, Assam, India

    Pradosh Mahadani & Sankar Kumar Ghosh

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  1. Pradosh Mahadani
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  2. Sankar Kumar Ghosh
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Correspondence to Sankar Kumar Ghosh.

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Mahadani, P., Ghosh, S.K. Utility of indels for species-level identification of a biologically complex plant group: a study with intergenic spacer in Citrus . Mol Biol Rep 41, 7217–7222 (2014). https://doi.org/10.1007/s11033-014-3606-7

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  • DOI: https://doi.org/10.1007/s11033-014-3606-7

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