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HEREDITAS ›› 2013, Vol. 35 ›› Issue (3): 373-378.doi: 10.3724/SP.J.1005.2013.00373

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Molecular mapping of test mapping strain for 18th linkage group re-cessive genes elp, ch-2 and mln in silkworm (Bombyx mori)

LIU Xian-Fang1, MA Xiao3, HOU Cheng-Xiang2, LI Bing1, LI Mu-Wang1,2   

  1. 1. Sericultural Research Institute, Jiangsu University of Science and Technology, Zhenjiang 212018, China 2. Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, China 3. College of Biotechnology and Environmental Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, China
  • Received:2012-10-11 Revised:2012-11-21 Online:2013-03-20 Published:2013-03-25

Abstract: The ellipsoid egg, the second recessive gene of chocolate larvae, and melanism are controlled by three recessive genes, elp, ch-2, and mln in silkworm, respectively. Their order and genetic distance have been scheduled in established linkage group. Owing to lack of crossing over in females, the reciprocal backcrossed F1(BC1) progenies were bred for linkage analysis using the wild type silkworm strain P50(+elp+ch-2+mln /+elp+ch-2+mln) and W18 with ellipsoid egg, the second recessive gene of chocolate larvae, and melanism (elp ch-2 mln / elp ch-2 mln). In this research, we mapped three mutant genes, elp, ch-2, and mln on the chromosome 18 based on the SSR linkage map and STS markers designed based on silkworm genome sequence. The established linkage group, molecular linkage group, and the physic map of chromosome 18 had been corresponded. The genetic distance for this chromosome in this research was 94.2 cM, and the order of the mutants and molecular markers were consistent with the established silkworm linkage maps and the fine ge-nome sequences. This research will lay important bases for map-based cloning for other mutants on chromosome 18.

Key words: Bombyx mori, 18th chromosome, mutant, molecular marker, gene mapping