COI1 Acts Upstream of EIN3/EIL1 and HLS1 in Regulation of Apical Hook Formation.
The hook phenotypes of 4-d-old etiolated Arabidopsis seedlings Col-0 (WT), coi1-2, ein3 eil1, coi1-2 ein3 eil1, hls1-1, and coi1-2 hls1-1 grown in the dark on MS medium supplied without (Mock) or with 5 μM MeJA (JA), 10 μM ACC, or 10 μM ACC plus 5 μM MeJA (ACC+JA).