Karrikinolide is a plant growth regulator that has been found in plant-derived smoke. It increases the germination rate and seedling mass in a panel of eight arable weed species when applied to filter paper at a concentration of 1 μM. Topical application of karrikinolide (0.1 nM) increases the number of leaves, leaf length, and fresh and dry leaf weights in commercial onion (A. cepa) plants.
Forest fires are actually beneficial for ecosystems, provided they don’t happen too often. After a fire, plants germinate and grow incredibly fast. KAR1 is a compound in smoke responsible for promoting the seed germination of a wide range of plant species
![3-METHYL-2H-FURO[2,3-C]PYRAN-2-ONE Structure](/CAS2/GIF/857054-02-5.gif)