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Application of DNA Barcoding to Identify Medicinal Plants

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DNA barcoding: a new tool for palm taxonomists?

Marc L Jeanson¹, Jean-Noël Labat, Damon P Little

¹Lewis B. and Dorothy Cullman Program for Molecular Systematics, The New York Botanical Garden, Bronx, NY 10458-5126, USA. mjeanson@nybg.org

Annals of Botany

|July 16, 2011

Summary

DNA barcoding shows promise for identifying palm species. Combining matK, rbcL, and nrITS2 DNA markers achieved 92% species discrimination in the Caryoteae tribe.

Area of Science:

Botany
Molecular Biology
Genetics

Background:

DNA barcoding is an emerging tool for species identification.
The Consortium for the Barcode of Life's Plant Working Group (CBOL-PWG) proposed matK and rbcL as core DNA markers.
Palms (Arecaceae/Palmae) present taxonomic challenges, making them suitable for DNA barcoding application.

Purpose of the Study:

To test the efficacy of DNA barcoding in palms (Arecaceae).
To evaluate the discriminatory power of proposed core markers (matK, rbcL) and additional markers in the tribe Caryoteae.
To identify optimal DNA marker combinations for palm species identification.

Main Methods:

Analysis of four DNA markers: plastid-encoded matK, rbcL, psbA-trnH, and nuclear-encoded nrITS2.

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Inclusion of 40 out of 48 species from the Southeast Asian tribe Caryoteae (subfamily Coryphoideae).

Assessment of marker variation for species discrimination.

Main Results:

A combination of matK, rbcL, and nrITS2 achieved 92% species discrimination.
The core markers rbcL and matK alone showed low species discrimination.
The nuclear marker nrITS2 proved more effective than psbA-trnH for supplementing the core markers in Caryoteae.

Conclusions:

This study represents the first DNA barcoding test in Arecaceae.
The results are encouraging for developing DNA barcoding in palms, despite their variable mutation rates.
DNA barcoding, particularly with the marker combination matK, rbcL, and nrITS2, shows potential for identifying species within this important tropical plant family.