characterized and cloned an Arabidopsis gene, AS1/2 ENHANCER7 (AE7), which is
required for both leaf adaxial–abaxial polarity formation and normal cell proliferation. The
ae7 mutant exhibited leaf adaxial–abaxial polarity defects and double mutants combining
ae7 with the leaf polarity mutants as1 (asymmetric leaves1), as2, rdr6 (RNA‐dependent
RNA polymerase6) or ago7/zip (argonaute7/zippy) all resulted in plants with an apparently …