FIGURE 3.

Genetic characterization of DHJA-Trp insensitive mutant tcor1-D. Seedlings were grown 4 days on MS agar plates with 40 μM DHJA-Trp, then rotated 180° for 36 h. (A) The impaired gravitropic response of wild type is evident, while roots of tcor1-D reoriented their growth in the direction of the new gravity vector (down in this image). The F₁ was from a cross between wild type Col-0 (female) and homozygous tcor1-D (male). (B) F₂ seedlings from a single F₁ plant segregated 9:23 (sensitive: resistant; sensitive seedlings indicated with asterisks), consistent with a dominant mutation.