Genomic characterization and expression analysis of transcription factors in and .

The plant-specific transcription factor plays important roles in plant development and environment adaptation. and , the C4 model plants, can grow on drought or arid soils. However, there is no systematic information about the genomic dissection and the expression of genes. A total of 22 genes were both identified from and genomes. They all contained bHLH domain and were grouped into three main clades (PCF, CIN, and CYC/TB1). The genes in the same clades shared similar gene structures. Cis-element in the promoter regions were analyzed and associated with hormones and stress responsiveness. Ten genes were predicted to be targets of miRNA319. Moreover, gene ontology analysis indicated three Si and three genes were involved in the regulation of shoot development, and were clustered together with tillering controlling gene . The genes were differentially expressed in the organs, but orthologs shared similar expression patterns. Ten members were downregulated under drought or salinity stresses, indicating they may play regulatory roles in abiotic stresses. The study provides detailed information regarding genes, providing the theoretical basis for agricultural applications.