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Physiological effects of the synthetic strigolactone analog GR24 on root system architecture in arabidopsis: Another belowground role for strigolactones?

AutorRuyter-Spira, Carolien; Kohlen, Wouter; Charnikhova, Tatsiana; van Zeijl, Arjan; van Bezouwen, Laura; de Ruijter, Norbert; Cardoso, Catarina; López-Ráez, Juan A.; Matusova, Radoslava; Bours, Ralph; Verstappen, Francel; Bouwmeester, Harro
Palabras claveArabidopsis-desarrollo
Estrigolactona
Hormonas vegetales
Relaciones planta-microbio
Fecha de publicaciónfeb-2011
EditorAmerican Society of Plant Biologists
CitaciónPlant Physiology 155(2): 721-734 (2011)
ResumenIn this study, the role of the recently identified class of phytohormones, strigolactones, in shaping root architecture was addressed. Primary root lengths of strigolactone-deficient and -insensitive Arabidopsis (Arabidopsis thaliana) plants were shorter than those of wild-type plants. This was accompanied by a reduction in meristem cell number, which could be rescued by application of the synthetic strigolactone analog GR24 in all genotypes except in the strigolactone-insensitive mutant. Upon GR24 treatment, cells in the transition zone showed a gradual increase in cell length, resulting in a vague transition point and an increase in transition zone size. PIN1/3/7-green fluorescent protein intensities in provascular tissue of the primary root tip were decreased, whereas PIN3-green fluorescent protein intensity in the columella was not affected. During phosphatesufficient conditions, GR24 application to the roots suppressed lateral root primordial development and lateral root forming potential, leading to a reduction in lateral root density. Moreover, auxin levels in leaf tissue were reduced. When auxin levels were increased by exogenous application of naphthylacetic acid, GR24 application had a stimulatory effect on lateral root development instead. Similarly, under phosphate-limiting conditions, endogenous strigolactones present in wild-type plants stimulated a more rapid outgrowth of lateral root primordia when compared with strigolactone-deficient mutants. These results suggest that strigolactones are able to modulate local auxin levels and that the net result of strigolactone action is dependent on the auxin status of the plant.We postulate that the tightly balanced auxin-strigolactone interaction is the basis for the mechanism of the regulation of the plants' root-to-shoot ratio. © 2010 American Society of Plant Biologists.
Versión del editorhttp://doi.org/10.1104/pp.110.166645
URIhttp://hdl.handle.net/10261/159144
Identificadoresdoi: 10.1104/pp.110.166645
issn: 0032-0889
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