Development of a DNA marker for variety discrimination specific to 'Manten-Kirari' based on an NGS-RNA sequence in Tartary buckwheat (Fagopyrum tataricum).

• This is the first study of variety discrimination in a Polygonaceae family. • DNA markers based on RNA polymorphism can discriminate buckwheat varieties. • The marker is promising for rutin-rich foods to prevent rutinosidase contamination. • The method is suitable to detect contamination of variety in buckwheat flour/noodles. To discriminate the trace-rutinosidase variety of Tartary buckwheat 'Manten-Kirari', we developed DNA markers based on RNA polymorphism. Specifically, we mapped 17.76 GB RNA sequences, obtained using HiSeq2000, to create 11,358 large contigs constructed de novo from 'Manten-Kirari' RNA derived from GS-FLX+ titanium. From these, we developed eight DNA markers corresponding to single- to four-nucleotide polymorphisms between 'Manten-Kirari' and 'Hokkai T8', which is representative of normal rutinosidase content varieties in Japan. Using these markers, 'Manten-Kirari' was discriminated from 'Hokkai T8' by eight markers, from major Tartary buckwheat varieties by three markers, and from common buckwheats by two markers. We also performed direct PCR from flour and dried noodle made with 'Manten-Kirari' and 'Hokkai T8'. Based on the results, the DNA markers developed are promising for discriminating 'Manten-Kirari'. This is the first study to develop a DNA marker to discriminate varieties in the Polygonaceae family including buckwheat species. [ABSTRACT FROM AUTHOR]