Genome-Wide Identification and Expression Analysis under Abiotic Stress of BrAHL Genes in Brassica rapa

The AT-hook motif nuclear localized ( ) gene family is a highly conserved transcription factor critical for the growth, development, and stress tolerance of plants. However, the function of the gene family in ( ) remains unclear. In this study, 42 family members were identified from the genome and mapped to nine chromosomes. Two clades have formed in the evolution of the gene family. The results showed that most products encoded by family genes are located in the nucleus. Gene duplication was common and expanded the gene family. According to the analysis of -regulatory elements, the genes interact with stress responses (osmotic, cold, and heavy metal stress), major hormones (abscisic acid), and light responses. In addition, the expression profiles revealed that genes are widely expressed in different tissues. was upregulated at 4 h under drought stress, highly expressed under cadmium conditions, and downregulated in response to cold conditions. and were upregulated at the initial time point and peaked at 12 h under cold and cadmium stress, respectively. Notably, the interactions between genes and proteins under drought, cold, and heavy metal stresses were observed when predicting the protein-protein interaction network.