 This study examined the genetic diversity of rice cultivars over time, using a combination of high throughput sequencing and a high density S&P array. The results showed that the genetic diversity of the cultivars had decreased due to selective breeding, but that there were still many unique haplotypes present. This suggests that the genetic diversity of rice can be maintained through careful breeding practices. This article was authored by Shabayateko, Nokojima Maiko, Ebana Kaworu, and others.