Karrikinolide (KAR1) was discovered by Ghisalberti, Flematti and colleagues, University of Western Australia in 2009.
Karrikinolide, found in smoke water extracts, acts as a key germination trigger for many species from fire-prone, Mediterranean climates, but is also active in plants from temperate regions. Karrikinolide enhances expression of the gibberellic acid biosynthetic genes, GA3ox1 and GA3ox2, during seed imbibition. Karrikinolide stimulation of Arabidopsis germination is lightdependent and reversible by far-red exposure, although limited induction of GA3ox1 still occurs in the dark.
Dixon KW (2009) Karrikinolide - a phytoreactive compound derived from smoke with applications in horticulture, ecological restoration and agriculture. Acta Hortic. 813:155
Flematti R (2009) Identification of alkyl substituted 2H-furo[2,3-c]pyran-2-ones as germination stimulants present in smoke. J. Agric. Food Chem 57:9475
Nelson DC et al (2009) Karrikins discovered in smoke trigger Arabidopsis seed germination by a mechanism requiring gibberellic acid synthesis and light. Plant Physiol. 149:863