For 10 points, name this destructive phenomenon that clears out dry underbrush and is often caused by lightning.
This process produces a class of butenolides called karrikins, which bind to KAI2 receptors on seeds. Banksia plants have serotinous follicles and lignotubers that facilitate resprouting in response to this stimulus. Smudge pots use this process to protect fruit orchards from frost. This phenomenon is promoted by eucalypts, which have epicormic buds and insulated seed capsules. This phenomenon occurs in surface and crown types and is common in a namesake regime that is supported by plants such as ponderosa pine, which have resin- sealed cones and sparse lower branches. It can increase soil nutrition by producing an ash bed. For 10 points, name this destructive phenomenon that clears out dry underbrush and is often caused by lightning.
This process produces a class of butenolides called karrikins, which bind to KAI2 receptors on seeds.
wildfire [or brushfire; or forest fire; or burning; or obvious equivalents; prompt on heat and smoke]