JOURNAL ARTICLE

Genome-wide analysis of the GRAS gene family in Chinese cabbage (Brassica rapa ssp. pekinensis)

Xiao-Ming Song, Tong-Kun Liu, Wei-Ke Duan, Qing-Hua Ma, Jun Ren, Zhen Wang, Ying Li, Xi-Lin Hou
Genomics 2014, 103 (1): 135-46
24365788
The GRAS gene family is one of the most important families of transcriptional regulators. In this study, 48 GRAS genes are identified from Chinese cabbage, and they are classified into eight groups according to the classification of Arabidopsis. The characterization, classification, gene structure and phylogenetic construction of GRAS proteins are performed. Distribution mapping shows that GRAS proteins are nonrandomly localized in 10 chromosomes. Fifty-five orthologous gene pairs are shared by Chinese cabbage and Arabidopsis, and interaction networks of these orthologous genes are constructed. The expansion of GRAS genes in Chinese cabbage results from genome triplication. Among the 17 species examined, 14 higher plants carry the GRAS genes, whereas two lower plants and one fungi species do not. Furthermore, the expression patterns of GRAS genes exhibit differences in three tissues based on RNA-seq data. Taken together, this comprehensive analysis will provide rich resources for studying GRAS protein functions in Chinese cabbage.

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