Identification and Expression Profiling of the Auxin Response Factors in Dendrobium officinale under Abiotic Stresses.

Auxin response factor (ARF) proteins play roles in plant responses to diverse environmental stresses by binding specifically to the auxin response element in the promoters of target genes. Using our latest public transcriptomes, a comprehensive characterization and analysis of 14 genes were performed. Three selected , including , , and , were confirmed to be nuclear proteins according to their transient expression in epidermal cells of leaves. Furthermore, the transcription activation abilities of , , and were tested in a yeast system. Our data showed that is a transcriptional activator in . To uncover the basic information of gene responses to abiotic stresses, we analyzed their expression patterns under various hormones and abiotic treatments. Based on our data, several hormones and significant stress responsive genes have been identified. Since auxin and genes have been identified in many plant species, our data is imperative to reveal the function of mediated auxin signaling in the adaptation to the challenging environment.