BR sensitivity of cp3. A. Transcriptional inhibition of CPD expression in response to BL was determined in cp3, Ler, bri1-301, and Col. B. Root growth was measured from the indicated plants grown vertically in 1/2 MS media containing BL. Root length is represented as the relative growth compared to that of the mock-treated sample. C. Root growth was measured from Ler and cp3 plants grown vertically in 1/2 MS media containing the various plant hormones indicated. Root length of the plants treated with hormones is represented as a percentage of the root length of the plants grown on the medium without hormone treatment. Experiments were repeated three times. Error bars denote standard errors.