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Identification of AFLP markers linked to the epistatic suppressor gene of a recessive genic male sterility in rapeseed and conversion to SCAR markers

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A recessive epistatic genic male sterility (REGMS) two-type line, 9012AB, has been used for rapeseed hybrid seed production in China. The male sterility of 9012AB is controlled by two recessive duplicate sterile genes (ms1 and ms2) interacting with one recessive epistatic suppressor gene (esp). Homozygosity at the esp locus (espesp) suppresses the expression of the recessive male sterility trait in homozygous ms1ms1ms2 ms2 plants. In this study, we used a combination of bulked segregant analyses and amplified fragment length polymorphism (AFLP) to identify markers linked to the suppressor gene in a BC1 population. From the survey of 1024 AFLP primer combinations, eight markers tightly linked to the target gene were identified. The two closest markers flanking both sides of Esp, P9M5370 and S16M14780, had a genetic distance of 1.4 cM and 2.1 cM, respectively. The AFLP fragment from P4M8190, which co-segregated with the target gene was converted into a sequence characterized amplified region marker. The availability of linked molecular markers will facilitate the utilization of REGMS in hybrid breeding in Brassica napus.
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Keywords: Brassica napus; marker-assisted selection; molecular marker; temporary maintainer line

Document Type: Research Article

Affiliations: National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement (Wuhan Branch), Huazhong Agricultural University, Wuhan 430070, China

Publication date: 01 April 2008

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