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Flowering time (FT) is a critical trait in Brassica rapa cultivation,as it determines the geographical range and timing of crop growth.To identify genes underlying variation in flowering time,66 SSR markers physically linked to genes involved in flowering time regulation (FT genes) and 280 genome-wide single nucleotide polymorphism (SNP) markers were profiled over a B.rapa core collection of 218 accessions,representing all morphotypes and geographical origins.