Comprehensive analysis of PLATZ family genes and their responses to abiotic stresses in Barley.

Background: Plant A/T-rich protein and zinc-binding protein (PLATZ) transcription factors are pivotal regulators in various aspects of plant biology, including growth, development, and responses to environmental stresses. While PLATZ genes have been extensively studied and functionally characterized in various plants, limited information is available for these genes in barley.

Results: Here, we discovered a total of 11 PLATZ genes distributed across seven chromosomes in barley. Based on phylogenetic and conserved motif analysis, we classified PLATZ into five subfamilies, comprising 3, 1, 2, 1 and 4 genes, respectively. Analysis of gene structure demonstrated that these 11 HvPLATZ genes typically possessed two to four exons. Most HvPLATZ genes were found to possess at least one ABRE cis-element in their promoter regions, and a few of them also contained LTR, CAT-box, MRE, and DRE cis-elements. Then, we conducted an exploration of the expression patterns of HvPLATZs, which displayed notable differences across various tissues and in response to abiotic stresses. Functional analysis of HvPLATZ6 and HvPLATZ8 in yeast cells showed that they may be involved in drought tolerance. Additionally, we constructed a regulatory network including miRNA-targeted gene predictions and identified two miRNAs targeting two HvPLATZs, such as hvu-miR5053 and hvu-miR6184 targeting HvPLATZ2, hvu-miR6184 targeting HvPLATZ10.

Conclusion: In summary, these findings provide valuable insights for future functional verification of HvPLATZs and contribute to a deeper understanding of the role of HvPLATZs in response to stress conditions in barley.