[Identification of Notopterygium seeds using DNA barcoding method].

Area of Science:

• Botany
• Molecular Biology
• Pharmacognosy

Background:

• Accurate identification of medicinal plant species is crucial for ensuring product quality and efficacy.
• Traditional methods for distinguishing Notopterygium seeds (N. incisum and N. franchetii) are often unreliable due to similar morphological characteristics.

Purpose of the Study:

• To verify the efficacy of DNA barcoding using the ITS2 region for species identification of Notopterygium seeds.
• To establish a reliable molecular method for quality control of Notopterygium medicinal materials.

Main Methods:

• Collection of 27 Notopterygium seed samples from major producing regions.
• Morphological characterization of seed samples.
• DNA extraction, PCR amplification, DNA sequencing, and DNA assembly.
• Species identification using distance methods, Neighbor-Joining (NJ) tree analysis, and a dedicated DNA barcoding system for Traditional Chinese Medicine (TCM).

Main Results:

• Morphological analysis revealed significant similarities between N. incisum and N. franchetii seeds, making them difficult to differentiate.
• Molecular identification confirmed 24 out of 27 samples as genuine, comprising 13 N. incisum and 11 N. franchetii.
• DNA barcoding successfully distinguished between the two species, overcoming limitations of morphological identification.

Conclusions:

• DNA barcoding using the ITS2 region is an accurate and efficient method for identifying Notopterygium species.
• This molecular approach provides a robust tool for the identification of medicinal plant germplasm resources.
• The study offers guidelines for establishing quality standards for Chinese herbal seeds and seedlings.