TY - JOUR
T1 - Inhibition of shoot branching by new terpenoid plant hormones
AU - Umehara, Mikihisa
AU - Hanada, Atsushi
AU - Yoshida, Satoko
AU - Akiyama, Kohki
AU - Arite, Tomotsugu
AU - Takeda-Kamiya, Noriko
AU - Magome, Hiroshi
AU - Kamiya, Yuji
AU - Shirasu, Ken
AU - Yoneyama, Koichi
AU - Kyozuka, Junko
AU - Yamaguchi, Shinjiro
N1 - Funding Information:
Acknowledgements We are grateful to S. Ishikawa for sequencing the d17-1 allele; K. Fujiwara for assistance in preparing plant materials; N. Makita and H. Sakakibara for their advice on rice hydroponic culture; and Y. Tsuchiya for advice on germination assays. We thank the Salk Institute and the Arabidopsis Biological Resource Center for providing Arabidopsis T-DNA insertion lines; T. Yokota, K. Yoneyama and X. Xie for sharing information on strigolactone analysis; M. Maekawa for propagating rice seeds; and K. Mori, P. McCourt and A. Gabar Babiker for providing (1)-strigol and 2’-epi-orobanchol, (1)-GR24, and S. hermonthica seeds, respectively. This work was supported in part by grants from the MEXT of Japan (1820810 to K.Y., 19678001 to K.S. and 19780040 to Sa.Y.) and the MAFF of Japan (Genomics for Agricultural Innovation, IPG0001 to J.K.). M.U. is supported by the RIKEN Special Postdoctoral Researchers Program.
PY - 2008/9
Y1 - 2008/9
N2 - Shoot branching is a major determinant of plant architecture and is highly regulated by endogenous and environmental cues. Two classes of hormones, auxin and cytokinin, have long been known to have an important involvement in controlling shoot branching. Previous studies using a series of mutants with enhanced shoot branching suggested the existence of a third class of hormone(s) that is derived from carotenoids, but its chemical identity has been unknown. Here we show that levels of strigolactones, a group of terpenoid lactones, are significantly reduced in some of the branching mutants. Furthermore, application of strigolactones inhibits shoot branching in these mutants. Strigolactones were previously found in root exudates acting as communication chemicals with parasitic weeds and symbiotic arbuscular mycorrhizal fungi. Thus, we propose that strigolactones act as a new hormone class - or their biosynthetic precursors - in regulating above-ground plant architecture, and also have a function in underground communication with other neighbouring organisms.
AB - Shoot branching is a major determinant of plant architecture and is highly regulated by endogenous and environmental cues. Two classes of hormones, auxin and cytokinin, have long been known to have an important involvement in controlling shoot branching. Previous studies using a series of mutants with enhanced shoot branching suggested the existence of a third class of hormone(s) that is derived from carotenoids, but its chemical identity has been unknown. Here we show that levels of strigolactones, a group of terpenoid lactones, are significantly reduced in some of the branching mutants. Furthermore, application of strigolactones inhibits shoot branching in these mutants. Strigolactones were previously found in root exudates acting as communication chemicals with parasitic weeds and symbiotic arbuscular mycorrhizal fungi. Thus, we propose that strigolactones act as a new hormone class - or their biosynthetic precursors - in regulating above-ground plant architecture, and also have a function in underground communication with other neighbouring organisms.
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U2 - 10.1038/nature07272
DO - 10.1038/nature07272
M3 - Article
C2 - 18690207
AN - SCOPUS:51649112342
SN - 0028-0836
VL - 455
SP - 195
EP - 200
JO - Nature
JF - Nature
IS - 7210
ER -