QTL analysis of seed size by a high-density GBS genetic map in watermelon (Citrullus lanatus L.)
Seed size is an important agronomic trait in watermelon, therefore understanding the genetic regulation mechanism of seed size is beneficial to the genetic improvement and marker-assisted selection breeding in watermelon. In this study, a high-density GBS genetic map of watermelon was constructed by an F2 population derived from K2 and L1, which included 6164 SNP markers on 11 chromosomes spanning 2524.07 cM. The average genetic distance was 0.41 cM. Based on the high-density genetic map, a total of nine QTLs were detected on chromosomes 2, 3, 5, 7 and 10, respectively. The two QTLs SW2.1 and 20SWT2.1 were identified in the same region on chromosome 2, and exhibited the major QTL which could explain 35.52-50.10%.
Gao, Meiling, Liang, Xiaoxue, Guo, Yu, Zhang, Yanlin, Gao, Yue, Liu, Xiujie, Liu, Jixiu, Liu, Xiao song, Yu, Changbao and Li, Jiayi (2020). QTL analysis of seed size by a high-density GBS genetic map in watermelon (Citrullus lanatus L.). Acta Hortic. 1294, 121-126
watermelon, seed size, QTL loci, GBS genetic map