Fig. 5. Genetic interactions between GIS2, SPY and trichome initiation regulators in Arabidopsis. (A,B) Trichome initiation on flowers of spy-3 (A) and 35S:GIS2 spy-3 mutants (B). (C) Trichome initiation on stems of gl1, gl3, 35S:GIS2 gl1 and 35S:GIS2 gl3 plants. (D) Effect of R overexpression on trichome initiation on gis2 flowers (left) and third branches (right). (E) GL1 expression in inflorescence organs of two 35S:GIS2 overexpressor lines (left) and in the gis2 mutant (right). Transcript levels were measured by real-time PCR and the values represent ratios of normalized levels to controls. U.I., upper developing inflorescence; W.I., whole developing inflorescence; WT, wild type.