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Loose-curd cauliflower (Brassica oleracea var.botrytis) is widely cultivated in China for its excellent quality,but most of the genetic studies have routinely used the compact-curd variety that is more popular in Europe and America.In the present study,we analyzed the genetic diversity of 57 Brassica oleracea genotypes worldwide,including 33 loose-curd cauliflower accessions,by using simple sequence repeat primer pairs.