(F) Determination of the effect of the tra1a and tra1b mutations on flowering time. The top panel shows numbers of rosette leaves of the WT, tra1a-1, tra1a-2, and tra1b mutant plants; the bottom panel shows a photograph of the plants. Rosette leaves from at least 20 null were counted for each genotype. Values are mean ± SD. ** P<0.01, student's t test. 