JA responsiveness of hy1 atmyc2 d ouble mutants. A, Root growth of 16-day-old wild-type and various mutant plants grown in constant WL (90 μmol m-2 s-1) in presence of 15 μM JA. B, Quantification of root length of A. C, Relative induction of VSP2 expression by JA in wild-type and mutant plants. For experimental detail, see legend to Figure 4C.