DNA barcodes from four loci provide poor resolution of taxonomic groups in the genus Crataegus

Crataegus chrysocarpa (fireberry hawthorn, NT516, North Okanagan Regional District, British Columbia, Canada). Photo © Mehdi Zarrei 2010.
Crataegus chrysocarpa (fireberry hawthorn, NT516, North Okanagan Regional District, British Columbia, Canada). Photo © Mehdi Zarrei 2010.

The leaves and fruits of some of the approximately 230 species of hawthorn (Crataegus) yield natural health products with significant therapeutic effects on symptoms of cardiovascular disease. DNA barcoding could be a valuable tool for authenticating these products. However, in a new study published in AoB PLANTS, only a small fraction of the 93 taxa examined by Zarrei et al. were distinguished, even though all major clades and eight out of ten taxonomic sections of the genus were included. DNA barcoding as currently practised thus has limited utility in Crataegus. Hybridization, lineage sorting due to incomplete concerted evolution in ITS2, and limited variation in plastid loci are implicated.

AoBPLANTS

AoB PLANTS is an open-access, online journal that publishes peer-reviewed articles on all aspects of environmental and evolutionary biology. Published by Oxford University Press, AoB PLANTS provides a fast-track pathway for publishing high-quality research, where papers are available online to anyone, anywhere free of charge. Reasons to publish in AoB PLANTS include double-blind peer review of manuscripts, rapid processing time and low open-access charges.

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