Pre treating ‘Sparkle’ petals with 1 1-MCP + E led to the suppression of Rh LAC in presence of ethylene (Fig. 4), while E resulted in strong expression of Rh LAC, as a significant (P = 0.01) difference was observed in the relative expression of Rh LAC between treatments.The relative expression of the RhLAC gene in E treated petals was twelvef old, compared to expression under 1 1-MCP + E which was considered as one (Fig. 4).