Strigolactone

General chemical structure and numbering scheme of strigolactones

Strigolactones are plant hormones that have been implicated in inhibition of shoot branching.^{[1] [2]} Strigolactones are carotenoid-derived and trigger germination of parasitic plant seeds (for example Striga from which they gained their name) and stimulate symbiotic mycorrhizal fungi.^[3] Strigolactones 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.

Chemistry

Strigolactones are terpenoid lactones and are derived from carotenoids.

(+)-Strigol	(+)-Strigyl acetate
(+)-Orobanchol	(+)-Orobanchyl acetate
(+)-5-Deoxystrigol	Sorgolactone

See also

• Plant hormone

References

1. ^ Gomez-Roldan V, Fermas S, Brewer PB, Puech-Pagès V, Dun EA, Pillot JP, Letisse F, Matusova R, Danoun S, Portais JC, Bouwmeester H, Bécard G, Beveridge CA, Rameau C, Rochange SF (2008). "Strigolactone inhibition of shoot branching". Nature 455 (7210): 180–194. doi:10.1038/nature07271. PMID 18690209. 
2. ^ Umehara M, Hanada A, Yoshida S, Akiyama K, Arite T, Takeda-Kamiya N, Magome H, Kamiya Y, Shirasu K, Yoneyama K, Kyozuka J, Yamaguchi S (2008). "Inhibition of shoot branching by new terpenoid plant hormones". Nature 455 (7210): 195–200. doi:10.1038/nature07272. PMID 18690207. 
3. ^ Kohki Akiyama, Hideo Hayashi (2006). "Strigolactones: Chemical Signals for Fungal Symbionts and Parasitic Weeds in Plant Roots". Annals of Botany 97 (6): 925–931. doi:10.1093/aob/mcl063. PMC 2803390. PMID 16574693. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2803390.