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Plant DNA barcoding: from gene to genome.

Xiwen Li1, Yang Yang, Robert J Henry

  • 1State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, 999078, China.

Biological Reviews of the Cambridge Philosophical Society
|March 27, 2014
PubMed
Summary

DNA barcoding effectively identifies plant species, but single markers are insufficient for closely related ones. Combining single-locus DNA barcodes with chloroplast genome sequencing offers a powerful approach for precise plant identification.

Keywords:
plastid-sequencingsingle-locus barcodespecific barcodesuper-barcodeuniversal

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Area of Science:

  • Molecular Biology
  • Botany
  • Genomics

Background:

  • DNA barcoding is a standard method for rapid and accurate plant species identification.
  • Existing single-locus DNA barcodes often lack sufficient variation for distinguishing closely related taxa.
  • Advances in sequencing technology have increased the availability of whole-chloroplast genome sequences.

Purpose of the Study:

  • To review the development of candidate DNA barcodes for plant identification.
  • To discuss the feasibility of utilizing the whole-chloroplast genome as a 'super-barcode'.
  • To propose an integrated approach combining single-locus barcodes and super-barcodes for enhanced plant identification.

Main Methods:

  • Review of existing literature on DNA barcoding and chloroplast genome sequencing.
  • Analysis of the variability and effectiveness of different barcoding loci.
  • Discussion of the resource requirements and speed of chloroplast genome sequencing versus single-locus methods.

Main Results:

  • Single-locus DNA barcodes are insufficient for resolving closely related plant species.
  • Whole-chloroplast genome sequencing offers high resolution but is currently not resource-effective or rapid for all laboratory settings.
  • A combined strategy utilizing both single-locus and chloroplast genome data is proposed.

Conclusions:

  • A hybrid DNA barcoding approach, integrating single-locus and whole-chloroplast genome data, can improve plant identification accuracy.
  • This integrated method is particularly beneficial for distinguishing between closely related plant species and populations.
  • Future DNA barcoding strategies should consider tailored combinations of markers for specific taxonomic groups.