Structure-Function Relations of Strigolactone Analogs： Activity as Plant Hormones and Plant Interactions  

作　　者：Maja Cohen Cristina Prandi Ernesto G. Occhiato Silvia Tabasso Smadar Wininger Nathalie Resnick Yosef Steinberger Hinanit Koltai Yoram Kapulnik 

机构地区：[1]Institute of Plant Sciences, ARO, Volcani Center, Bet Dagan, Israel [2]The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel [3]Dipartirnento di Chimica, Universita di l:orino, via R Giuria 7, 10125 Torino,Italy [4]Dipartimento di Chimica 'Ugo Schiff', Universita degli Studi di Firenze, via della Lastruccia 13, Sesto Fiorentino, Firenze, Italy

出　　处：《Molecular Plant》2013年第1期141-152,共12页分子植物（英文版）

摘　　要：Strigolactones （SLs） have several functions as signaling molecules in their interactions with symbiotic arbus- cular mycorrhizal （AM） fungi and the parasitic weeds Orobanche and Striga. SLs are also a new class of plant hormone regulating plant development. In all three organisms, a specific and sensitive receptor-mediated perception system is suggested. By comparing the activity of synthetic SL analogs on Arabidopsis root-hair elongation, Orobanche aegypti- aca seed germination, and hyphal branching of the AM fungus Glomus intraradices, we found that each of the tested organisms differs in its response to the various examined synthetic SL analogs. Structure-function relations of the SL analogs suggest substitutions on the A-ring as the cause of this variation. Moreover, the description of competitive antagonistic analogs suggests that the A-ring of SL can affect not only affinity to the receptor, but also the molecule＇s ability to activate it. The results support the conclusion that Arabidopsis, Orobanche, and AM fungi possess variations in receptor sensitivity to SL analogs, probably due to variation in SL receptors among the different species.Strigolactones （SLs） have several functions as signaling molecules in their interactions with symbiotic arbus- cular mycorrhizal （AM） fungi and the parasitic weeds Orobanche and Striga. SLs are also a new class of plant hormone regulating plant development. In all three organisms, a specific and sensitive receptor-mediated perception system is suggested. By comparing the activity of synthetic SL analogs on Arabidopsis root-hair elongation, Orobanche aegypti- aca seed germination, and hyphal branching of the AM fungus Glomus intraradices, we found that each of the tested organisms differs in its response to the various examined synthetic SL analogs. Structure-function relations of the SL analogs suggest substitutions on the A-ring as the cause of this variation. Moreover, the description of competitive antagonistic analogs suggests that the A-ring of SL can affect not only affinity to the receptor, but also the molecule＇s ability to activate it. The results support the conclusion that Arabidopsis, Orobanche, and AM fungi possess variations in receptor sensitivity to SL analogs, probably due to variation in SL receptors among the different species.

关 键 词：STRIGOLACTONE Arabidopsis OROBANCHE AM fungus Glomus intraradices root hair seed germination hyphalbranching. 

分 类 号：Q946.885[生物学—植物学] O623.624[理学—有机化学]