gcr1 gpa1 double mutant resembles gpa1 single mutant in morphology. A, gcr1 gpa1 double mutant phenotypes of 2-d-old, dark-grown seedlings. B, Hypocotyl lengths of 2-d-old, dark-grown gcr1 gpa1 double mutant seedlings. Shown are the means ± se of 20 seedlings. C, gcr1 gpa1 double mutant phenotypes of 43-d-old, light-grown plant. Shown below are the 10th rosette leaves from wild-type (Col-0) and mutant plants.