General chemical structure and numbering scheme of strigolactones
Strigolactones are plant hormones that stimulate the branching and growth of symbiotic arbuscularmycorrhizalfungi, increasing the probability of contact and establishment of a symbiotic association between the plant and fungus. Strigolactones also inhibit plant shoot branching, and trigger germination of parasitic plant seeds (for example Striga, from which they gained their name). Strigolactones are carotenoid-derived and contain a labile ether bond that is easily hydrolyzed in the rhizosphere, meaning that there is a large concentration gradient between areas near the root and those further away. In 2009, strigolactone biosynthesis was found to be DWARF27-dependent.
Strigolactones were first discovered in Striga lutea (witchweed), a parasitic weed that lacks the ability to photosynthesize. Such plants use Strigolactones exuded from the roots of host plants as a cue for germination. Such mechanism enables them to germinate close to a suitable host.
^López-Ráez JA, Matusova R, Cardoso C, Jamil M, Charnikhova T, Kohlen W, Ruyter-Spira C, Verstappen F, Bouwmeester H (May 2009). "Strigolactones: ecological significance and use as a target for parasitic plant control". Pest Manag Sci.65 (5): 471–7. doi:10.1002/ps.1692. PMID19115242.
^Lin, H.; Wang, R., Qian, Q., Yan, M., Meng, X., Fu, Z., Yan, C., Jiang, B., Su, Z., Li, J., Wang, Y. (26 May 2009). "DWARF27, an Iron-Containing Protein Required for the Biosynthesis of Strigolactones, Regulates Rice Tiller Bud Outgrowth". THE PLANT CELL ONLINE21 (5): 1512–1525. doi:10.1105/tpc.109.065987. PMID19470589.Cite uses deprecated parameters (help)