Abstract
Root hair formation (RHF) of A. thaliana is suppressed by BR in the dark. Light can induce RHF by suppression of BR synthesis. We investigated the relationship between BR and RHF inducible hormones.
BR could not suppress promotive effect of ethylene on RHF irrespective of light condition. BR had no effect on ethylene production in the light. RHF, which was induced by BR biosynthesis inhibitor in the dark, did not accompany ethylene production. Therefore, BR and ethylene regulate RHF in the independent manner.
BR suppressed auxin induced RHF in the light. In the dark, auxin could not induce RHF. Therefore, BR should suppress RHF at downstream of auxin.
Auxin promoted RHF in the light was suppressed not by ethylene biosynthesis inhibitor AVG, but by ethylene perception inhibitor Ag+. Therefore, auxin promotes RHF through ethylene sensitivity.
