Combining the cpr1 haplotype with the snc1 haplotype or SNC1 transgene enhances the phenotypes. (A) Phenotypes of F1 plants from wild type (SNC1) × cpr1 and snc1 × cpr1 crosses. (B) Phenotypes of F1 hybrids carrying a hemizygous 35S:SNC1 transgene. (C) Steady-state expression levels of SNC1 determined by quantitative real-time PCR. SNC1 transcript level was compared to that of the Actin 2 (ACT2) gene. (D) Phenotypes of bal or snc1 homozygotes and their F1 hybrid. Scale bar: 1 cm.