Genome-Wide Identification of the Genes and Molecular Characterization of Their Transcriptional Responses to Various Nutrient Stresses in Allotetraploid Rapeseed.

is an important oil crop in China and has a great demand for nitrogen nutrients. Cationic amino acid transporters (CAT) play a key role in amino acid absorption and transport in plants. However, the family has not been reported in so far. In this study, genome-wide analysis identified 22 members in the genome. Based on phylogenetic and synteny analysis, were classified into four groups (Group I-Group IV). The members in the same subgroups showed similar physiochemical characteristics and intron/exon and motif patterns. By evaluating -elements in the promoter regions, we identified some -elements related to hormones, stress and plant development. Darwin's evolutionary analysis indicated that might have experienced strong purifying selection pressure. The family may have undergone gene expansion; the chromosomal location of indicated that whole-genome replication or segmental replication may play a major driving role. Differential expression patterns of under nitrate limitation, phosphate shortage, potassium shortage, cadmium toxicity, ammonium excess and salt stress conditions indicated that they were responsive to different nutrient stresses. In summary, these findings provide a comprehensive survey of the family and lay a foundation for the further functional analysis of family members.