... ) and RABBIT EARS ( RBE ) regulate petal initiation in Arabidopsis thaliana and their transcripts are expressed in sepal boundary and petal initiation sites, respectively, suggesting that PTL acts in a non-cell-autonomous manner. Here, we determined that cells expressing PTL and RBE fusion proteins did...

... organ have not been clearly explained. We isolated a novel mutant, rabbit ears ( rbe ),with defects in petal development. In rbe , under-developed petals are formed at the correct position in a flower, and the initiation of petal primordia is altered. The rbe mutation affects the second whorl organ...