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Cuticular waxes covering the outer plant surface impart a whitish appearance. Wax-less cabbage mutant shows glossy in leaf surface and plays important roles in riching cabbage germplasm resources and breeding brilliant green cabbage. This is the first report describing the characterization and fine-mapping of a wax biosynthesis gene using a novel glossy  Brassica oleracea  mutant. In the present paper, we identified a glossy cabbage mutant (line10Q-961) with a brilliant green phenotype. Genetic analyses indicated that the glossy trait was controlled by a single recessive gene. Preliminary mapping results using an F 2  population containing 189 recessive individuals revealed that the  Cgl1  gene was located at the end of chromosome C08. Several new markers closely linked to the target gene were designed according to the cabbage reference genome sequence. Another population of 1,172 recessive F 2  individuals was used to fine-map the  Cgl1  gene to a 188.7-kb interval between the C08SSR61 simple sequence repeat marker and the end of chromosome C08. There were 33 genes located in this region. According to gene annotation and homology analyses, the  Bol018504  gene, which is a homolog of  CER1  in  Arabidopsis thaliana , was the most likely candidate for the  Cgl1  gene. Its coding and promoter regions were sequenced, which indicated that the RNA splice site was altered because of a 2,722-bp insertion in the first intron of  Bol018504  in the glossy mutant. Based on the FGENESH 2.6 prediction and sequence alignments, the PLN02869 domain, which controls fatty aldehyde decarbonylase activity, was absent from the  Bol018504  gene of the 10Q-961 glossy mutant. We inferred that the inserted sequence in  Bol018504  may result in the glossy cabbage mutant. This study represents the first step toward the characterization of cuticular wax biosynthesis in  B. oleracea , and may contribute to the breeding of new cabbage varieties exhibiting a brilliant green phenotype.

Fine-Mapping and Analysis of Cgl1, a Gene Conferring Glossy Trait in Cabbage (Brassica oleracea L. var. capitata)