SRAP marker reveals genetic diversity in tartary buckwheat in China

Sequence-related amplified polymorphism (SRAP) marker was employed to analyze genetic diversity of 10 accessions of tartary buckwheat selected from a wide geographical area in China. Of the total 30 primer combinations investigated, 26 could amplify clearly and consistently. They produced a total of 285 fragments, of which 235 (82.5%) were polymorphic bands. Among the 26 primer combinations, five could discriminate all the genotypes used in this study. Based on the molecular data, the genetic similarity coefficients varied from 0.61 to 0.78 and calculated using the NTSYSpc published by Nei and Li (1979). The cluster analysis revealed that the 10 accessions were better to be grouped into two major clusters at a similarity level of 0.69. Moreover, the accessions collected from the same province turned out to be grouped in the same cluster, which indicated some geographical relationships. It also proved that the SRAP marker system was useful in identification and genetic diversity analysis of tartary buckwheat.