Fig. 2.

Ethylene-responsive gene expression in mutant leaves. (A) Four-week-old adult plants of Ws wt and the mutant were exposed to air (A) or 100 μl l⁻¹ ethylene (E) for 24 h, after which Northern blot analysis was performed to test for expression of ethylene-inducible genes. (B) As several genes are coordinately regulated by both ethylene and jasmonic acid, gene expression was also determined following exposure of leaves to air (A), 100 μM (+/–)-jasmonic acid (J) or 100 μM jasmonic acid with 100 μl l⁻¹ ethylene (JE).