INTERACTION BETWEEN A PLANT-DERIVED SMOKE EXTRACT, LIGHT AND PHYTOHORMONES ON THE GERMINATION OF LIGHT-SENSITIVE LETTUCE SEEDS

Plant-derived smoke extracts mimics the effect of red light on germina tion in light-sensitive lettuce seeds and partially overcomes the inhi bitory effect of far-red light. Interaction between a smoke extract an d gibberellins, cytokinins, abscisic acid and ethephon was investigate d. Smoke acted synergistically with GA(3) and increased the sensitivit y of the lettuce seeds to ABA. It seems likely that smoke affects memb rane permeability or receptor sensitivity rather than influencing the phytochrome system of these seeds.