Map-based cloning and characterization of BoCCD4, a gene responsible for white/yellow petal color in B. oleracea

BMC Genomics

Jianghua Song¹  Huilin Cui¹  Mu Zhuang²  Zhansheng Li²  Limei Yang²  Yangyong Zhang²  Fengqing Han²  Xiaoping Liu²  Yong Wang²  Honghao Lv²  Zhiyuan Fang²  Bin Zhang² 

[1] College of Horticulture, Anhui Agricultural University;Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture;

关键词: Brassica oleracea;    Petal color;    Fine mapping;    Candidate gene;    Functional validation;    Expression pattern;   

DOI  :  10.1186/s12864-019-5596-2

来源: DOAJ

【 摘 要 】

Abstract Background Brassica oleracea exhibits extensive phenotypic diversity. As an important trait, petal color varies among different B. oleracea cultivars, enabling the study of the genetic basis of this trait. In a previous study, the gene responsible for petal color in B. oleracea was mapped to a 503-kb region on chromosome 3, but the candidate gene has not yet been identified. Results In the present study, we report that the candidate gene was further delineated to a 207-kb fragment. BoCCD4, a homolog of the Arabidopsis carotenoid cleavage dioxygenase 4 (CCD4) gene, was selected for evaluation as the candidate gene. Sequence analysis of the YL-1 inbred line revealed three insertions/deletions and 34 single-nucleotide polymorphisms in the coding region of BoCCD4. Functional complementation showed that BoCCD4 from the white-petal inbred line 11–192 can rescue the yellow-petal trait of YL-1. Expression analysis revealed that BoCCD4 is exclusively expressed in petal tissue of white-petal plants, and phylogenetic analysis indicated that CCD4 homologs may share evolutionarily conserved roles in carotenoid metabolism. These findings demonstrate that BoCCD4 is responsible for white/yellow petal color variation in B. oleracea. Conclusions This study demonstrated that function loss of BoCCD4, a homolog of Arabidopsis CCD4, is responsible for yellow petal color in B. oleracea.

【 授权许可】

Unknown