Expression levels of candidate genes in hormone signaling mutants. The relative transcript abundance of candidate genes was analyzed in Arabidopsis hormone signaling mutants using qRT-PCR. AtRALFL8 (A), AtMGL (B), and AZI1 (C). Values are the average of three biological replicates of four plants each. Asterisks show significant differences in candidate gene expression level compared with the wild-type value (**P < 0.01, *P < 0.05).