| 描述信息 |
Soil salinization impacts plant growth and crop productivity primarily through osmotic stress and ion poisoning. Type-B Arabidopsis response regulators (B-ARRs) participate in cytokinin signaling and play vital roles in plant stress responses. However, their functions response to salt tolerance in maize remain unclear. In this study, we identified 9 B-ARRs in maize genome and found most of them responded to salt stress. Especially, the gene ZmARR2 showed the most significant induction under salt stress. We proved ZmARR2 possessed transcriptional activation activity. Mutating ZmARR2 increased the sensitivity of maize to salt stress and caused abnormal physiological changes, whereas overexpression of this gene enhanced salt tolerance. Transcriptome analysis revealed that ZmARR2 may be involved in salt tolerance through multiple pathways, including plant hormone signal transduction, the MAPK pathway, antioxidant defense systems, and secondary metabolism. Our findings enriched the genetic resources of maize and deepened our understanding of the mechanism of maize in salt tolerance. |
