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.
![3-METHYL-2H-FURO[2,3-C]PYRAN-2-ONE](https://www.chemicalbook.com/CAS2/GIF/857054-02-5.gif)