Fig. 4. Effect of hst-1 on leaf and carpel polarity. (A,B) Paradermal views of the adaxial and abaxial mesophyll layers of leaf 3 from wild-type (A) and hst-1 (B) plants. (C-E) Scanning electron micrographs of wild-type (C) and hst-1 (D,E) pistils; note the ovules located along the margins of the carpels (arrow). (F) Phenotype of kan-11, hst-1 and hst-1; kan-11 seedlings. Double mutant seedlings have more severely up-rolled leaves and cotyledons, and have a significantly larger number of abaxial trichomes than either single mutant.