ZmCASP1 is involved in Casparian strip formation and salt tolerance in maize.

ZmCASP1 is essential for Casparian strip formation and influences salt tolerance in maize, with the B104 haplotype showing impaired barrier function and increased Na+ accumulation.

• Why it matters: Understanding the molecular mechanisms of Casparian strip formation in maize is crucial because it affects water and solute transport and plant salt stress responses, which are vital for crop resilience and productivity.
• What they did: Researchers characterized ZmCASP1 in maize, analyzing sequence variations between B73 and B104 lines, and used assays such as propidium iodide penetration and lignin staining, along with mutant analysis, to assess its role.
• The result: Findings indicate ZmCASP1 involvement in CS formation and salt stress response, as the B104 haplotype and casp1 mutants exhibit defective barriers and higher Na+ levels, suggesting a role in ion homeostasis.