Genome-wide analysis of the R2R3-MYB transcription factor genes in Chinese cabbage (Brassica rapa ssp. pekinensis) reveals their stress and hormone responsive patterns.

Abstract:

BACKGROUND:The MYB superfamily is one of the most abundant transcription factor (TF) families in plants. MYB proteins include highly conserved N-terminal MYB repeats (1R, R2R3, 3R, and atypical) and various C-terminal sequences that confer extensive functions. However, the functions of most MYB genes are unknown, and have been little studied in Chinese cabbage. RESULTS:Here, we analyzed 256 (55.2% of total MYBs) R2R3-MYB genes from Chinese cabbage (Brassica rapa ssp. pekinensis) and anchored them onto the 10 chromosomes and three subgenomes. The R2R3-, 3R- and atypical MYB proteins in Chinese cabbage formed 45 subgroups based on domain similarity and phylogenetic topology. Organization and syntenic analysis revealed the genomic distribution and collinear relationships of the R2R3-BrMYBs. Synonymous nucleotide substitution (Ka/Ks) analysis showed that the Chinese cabbage MYB DNA-binding domain is under strong purifying selection. Moreover, RNA-seq data revealed tissue-specific and distinct R2R3-BrMYB expression profiles, and quantitative real-time PCR (qPCR) analysis in leaves showed stress responsive expression and crosstalk with ABA-auxin signaling cascades. CONCLUSIONS:In this study, we identified the largest MYB gene family in plants to date. Our results indicate that members of this superfamily may be involved in plant development, stress responses and leaf senescence, highlighting their functional diversity.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Wang Z,Tang J,Hu R,Wu P,Hou XL,Song XM,Xiong AS

doi

10.1186/s12864-015-1216-y

subject

Has Abstract

pub_date

2015-01-23 00:00:00

pages

17

issn

1471-2164

pii

s12864-015-1216-y

journal_volume

16

pub_type

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