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Evaluation of candidate barcoding markers in Orinus (Poaceae)
1Key Laboratory of Physical Geography and Environmental Process, Qinghai Province, Key Laboratory of Medicinal Animal and Plant Resource, Qinghai-Tibetan Plateau of Qinghai Province, Key Laboratory of Education Ministry of Environments and Resources in The Qinghai-Tibetan Plateau, School of Geography and Life Science, Qinghai Normal University, Xining, Qinghai, China.
DNA barcoding effectively identifies alpine grass species Orinus. The nuclear internal transcribed spacer (ITS) region showed the highest species differentiation, outperforming chloroplast markers alone or in combination.
Area of Science:
- Botany and Plant Taxonomy
- Molecular Ecology
- Genetics
Background:
- The alpine grass genus Orinus (Poaceae) is endemic to high-altitude regions.
- Morphological identification of Orinus species is challenging due to variability and homoplasy.
- DNA barcoding offers a promising approach for species delimitation in plants.
Purpose of the Study:
- To evaluate the efficacy of four DNA barcoding markers (matK, rbcL, trnH-psbA, and ITS) for identifying Orinus species.
- To determine the best marker or marker combination for differentiating Orinus species from the Qinghai-Tibetan Plateau.
Main Methods:
- Sequencing of four DNA barcoding regions: matK, rbcL, trnH-psbA, and ITS.
- Analysis of sequence data to assess the species differentiation power of individual markers and combinations.
- Comparison of nuclear ITS marker performance against chloroplast markers (matK, rbcL, trnH-psbA).
Main Results:
- The nuclear internal transcribed spacer (ITS) marker demonstrated the highest single-locus differentiation power for Orinus species.
- Chloroplast markers (matK, rbcL, trnH-psbA) alone were insufficient for species identification.
- Combinations of ITS with chloroplast markers, particularly trnH-psbA + ITS (H + I) and rbcL + ITS (R + I), achieved 100% species differentiation.
Conclusions:
- The nuclear ITS region is a more effective DNA barcode than chloroplast regions for distinguishing Orinus species.
- Combining the ITS marker with chloroplast markers can enhance the success rate of DNA barcoding in Orinus.
- This study provides a molecular framework for accurate species identification within the Orinus genus.
