Karrikin and cyanohydrin smoke signals provide clues to new endogenous plant signaling compounds
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Two new types of signaling compounds have been discovered in wildfire smoke due to their ability to stimulate seed germination. The first discovered were karrikins, which share some structural similarity with the strigolactone class of plant hormones, and both signal through a common F-box protein. However, karrikins and strigolactones operate through otherwise distinct signaling pathways, each distinguished by a specific α/β hydrolase protein. Genetic analysis suggests that plants contain endogenous compounds that signal specifically through the karrikin pathway. The other active compounds discovered in smoke are cyanohydrins that release germination-stimulating cyanide upon hydrolysis. Cyanohydrins occur widely in plants and have a role in defense against other organisms, but an additional role in endogenous cyanide signaling should also now be considered.
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Nelson, D.; Scaffidi, A.; Dun, E.; Waters, M.; Flematti, G.; Dixon, Kingsley; Beveridge, C.; Ghisalberti, E.; Smith, S. (2011)Smoke is an important abiotic cue for plant regeneration in postfire landscapes. Karrikins are a class of compounds discovered in smoke that promote seed germination and influence early development of many plants by an ...
Flematti, G.; Dixon, Kingsley; Smith, S. (2015)© 2015 Flematti et al. Karrikins are a family of compounds produced by wildfires that can stimulate the germination of dormant seeds of plants from numerous families. Seed plants could have 'discovered' karrikins during ...
Nelson, D.; Flematti, G.; Ghisalberti, E.; Dixon, Kingsley; Smith, S. (2012)It is well known that burning of vegetation stimulates new plant growth and landscape regeneration. The discovery that char and smoke from such fires promote seed germination in many species indicates the presence of ...