Identification of the Plant Family Caryophyllaceae in Korea Using DNA Barcoding

Area of Science:

• Botany
• Molecular Biology
• Biodiversity Studies

Background:

• The Caryophyllaceae family is significant in Korea, encompassing ornamental, medicinal, and endangered species.
• Accurate identification of plant species is crucial for conservation, resource management, and scientific research.

Purpose of the Study:

• To evaluate the efficacy of DNA barcoding for identifying Korean Caryophyllaceae species.
• To compare the discriminatory power of different DNA markers for this plant family.

Main Methods:

• Sequencing of three chloroplast DNA regions (rbcL, matK, psbA-trnH) and nuclear ribosomal internal transcribed spacers (ITS) from 78 taxa (n=215).
• Phylogenetic analysis using neighbor-joining trees to assess identification accuracy and resolution.
• Comparison of identification success rates between chloroplast markers and ITS, and their combined use.

Main Results:

• Internal transcribed spacers (ITS) provided higher identification accuracy (>73%) compared to chloroplast regions (<62%).
• Combining rbcL and ITS yielded the highest resolution (77.6%), though accuracy varied by genus.
• Five genera (Eremogone, Minuartia, Pseudostellaria, Sagina, Stellaria) were successfully identified, while five others (Cerastium, Gypsophila, Dianthus, Silene, Spergularia) showed low resolution.

Conclusions:

• DNA barcoding, particularly using ITS, is effective for identifying Korean Caryophyllaceae.
• Low resolution in certain genera suggests potential taxonomic complexities or issues with marker performance.
• The findings underscore the necessity for taxonomic reconsideration of Caryophyllaceae species in Korea.