Figure 7.

Auxin interacts with NTM2-mediated salt stress signals during seed germination. A, Germination phenotypes of auxin-related mutants under high salinity. Seeds of axr2-1 mutants and transgenic plants overexpressing the YUC3 gene (At1G04610) driven by the CaMV 35S promoter were cold imbibed and germinated on MS-agar plates supplemented with 150 mm NaCl. Germination assays were carried out as described in Figure 4B. Error bars indicate se. Statistical significance was determined by Student’s t test (* P < 0.01). Col-0, Ecotype Columbia. B, Schematic working model of NTM2 during seed germination under high salinity. A part of the NTM2-mediated salt signals is mediated by IAA30, which functions as a negative regulator of auxin signaling.