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Title: Varietal identification of tea (Camellia sinensis [L.] Kuntze) using nanofluidic array of Single Nucleotide Polymorphism (SNP) markers

Author
item FANG, WANPING - Nanjing Agricultural University
item Meinhardt, Lyndel
item TAN, HUAWEI - Nanjing Agricultural University
item ZHOU, LIN - Nanjing Agricultural University
item Mischke, Barbara
item Zhang, Dapeng

Submitted to: Horticulture Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/30/2014
Publication Date: 7/30/2014
Citation: Fang, W., Meinhardt, L.W., Tan, H., Zhou, L., Mischke, B.S., Zhang, D. 2014. Varietal identification of tea (Camellia sinensis [L.] Kuntze) using nanofluidic array of Single Nucleotide Polymorphism (SNP) markers. Horticulture Research. DOI:10.1038/hortres.2014.35.

Interpretive Summary: Apart from water, tea is the world’s most widely consumed beverage. Tea is produced in more than 50 countries with an annual production of 4.7 million tons. The market segment for specialty tea has been expanding rapidly owing to increased demand, resulting in higher revenues and profits for tea growers and the industry. Accurate varietal identification is critically important to ensure traceability and authentication of premium tea products, which in turn contribute to on-farm conservation of tea genetic diversity. Using a anofluidic DNA genotyping system, we developed a protocol for tea varietal identification based on both fresh and processed commercial loose-leaf teas. This method provides a powerful tool for variety authentication and quality control for the tea industry. It’s also highly useful for the management of tea genetic resources and breeding, where accurate and efficient varietal identification is essential. This information will be used by researchers, tea producers and tea industry to accurately determine varietal authenticity.

Technical Abstract: Apart from water, tea is the world’s most widely consumed beverage. Tea is produced in more than 50 countries with an annual production of approximately 4.7 million tons. The market segment for specialty tea has been expanding rapidly owing to increased demand, resulting in higher revenues and profits for tea growers and the industry. Accurate varietal identification is critically important to ensure traceability and authentication of premium tea products, which in turn contribute to on-farm conservation of tea genetic diversity. Using a set of single nucleotide polymorphism (SNP) markers developed from the expressed sequence tag (EST) database of Camilla senensis, we genotyped DNA samples extracted from a diverse group of tea varieties, including both fresh and processed commercial loose-leaf teas. The validation led to the designation of 60 SNPs that unambiguously identified all 40 tested tea varieties with high statistical rigor (P<0.0001). Varietal authenticity and genetic relationships among the analyzed cultivars were further characterized by ordination and Bayesian clustering analysis. These SNP markers, in combination with a high throughput genotyping protocol, effectively established and verified specific DNA fingerprints for all tested tea varieties. This method provides a powerful tool for variety authentication and quality control for the tea industry. It’s also highly useful for the management of tea genetic resources and breeding, where accurate and efficient genotype identification is essential.