Strigolactone inhibition of shoot branching

Victoria Gomez-Roldan, Soraya Fermas, Philip B. Brewer, Virginie Puech-Pagès, Elizabeth A. Dun, Jean-Paul Pillot, Fabien Letisse, Radoslava Matusova, Saida Danoun, Jean-Charles Portais, Harro Bouwmeester, Guillaume Bécard (), Christine A. Beveridge, Catherine Rameau () and Soizic F. Rochange
Additional contact information
Victoria Gomez-Roldan: Université de Toulouse; UPS; CNRS; Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France
Soraya Fermas: Station de Génétique et d’Amélioration des Plantes, Institut J. P. Bourgin, UR254 INRA, F-78000 Versailles, France
Philip B. Brewer: ARC Centre of Excellence for Integrative Legume Research, The University of Queensland
Virginie Puech-Pagès: Université de Toulouse; UPS; CNRS; Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France
Elizabeth A. Dun: ARC Centre of Excellence for Integrative Legume Research, The University of Queensland
Jean-Paul Pillot: Station de Génétique et d’Amélioration des Plantes, Institut J. P. Bourgin, UR254 INRA, F-78000 Versailles, France
Fabien Letisse: CNRS, UMR5504, INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, INSA de Toulouse, F-31400 Toulouse, France
Radoslava Matusova: Plant Research International, PO Box 16, 6700 AA Wageningen, the Netherlands
Saida Danoun: Université de Toulouse; UPS; CNRS; Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France
Jean-Charles Portais: CNRS, UMR5504, INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, INSA de Toulouse, F-31400 Toulouse, France
Harro Bouwmeester: Plant Research International, PO Box 16, 6700 AA Wageningen, the Netherlands
Guillaume Bécard: Université de Toulouse; UPS; CNRS; Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France
Christine A. Beveridge: ARC Centre of Excellence for Integrative Legume Research, The University of Queensland
Catherine Rameau: Station de Génétique et d’Amélioration des Plantes, Institut J. P. Bourgin, UR254 INRA, F-78000 Versailles, France
Soizic F. Rochange: Université de Toulouse; UPS; CNRS; Surface Cellulaire et Signalisation chez les Végétaux, 24 chemin de Borde Rouge, F-31326 Castanet-Tolosan, France

Nature, 2008, vol. 455, issue 7210, 189-194

Abstract: Abstract A carotenoid-derived hormonal signal that inhibits shoot branching in plants has long escaped identification. Strigolactones are compounds thought to be derived from carotenoids and are known to trigger the germination of parasitic plant seeds and stimulate symbiotic fungi. Here we present evidence that carotenoid cleavage dioxygenase 8 shoot branching mutants of pea are strigolactone deficient and that strigolactone application restores the wild-type branching phenotype to ccd8 mutants. Moreover, we show that other branching mutants previously characterized as lacking a response to the branching inhibition signal also lack strigolactone response, and are not deficient in strigolactones. These responses are conserved in Arabidopsis. In agreement with the expected properties of the hormonal signal, exogenous strigolactone can be transported in shoots and act at low concentrations. We suggest that endogenous strigolactones or related compounds inhibit shoot branching in plants. Furthermore, ccd8 mutants demonstrate the diverse effects of strigolactones in shoot branching, mycorrhizal symbiosis and parasitic weed interaction.

Date: 2008
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DOI: 10.1038/nature07271

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