Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 403501
Title Physiological effects of the synthetic strigolactone analog GR24 on root system architecture in Arabidopsis: Another below-ground role for strigolactones?
Author(s) Ruyter-Spira, C.P.; Kohlen, W.; Charnikhova, T.; Zeijl, A. van; Bezouwen, L. van; Ruijter, N.C.A. de; Cardoso, C.; Lopez Raez, J.A.; Matusova, R.; Bours, R.M.E.H.; Verstappen, F.W.A.; Bouwmeester, H.J.
Source Plant Physiology 155 (2011)2. - ISSN 0032-0889 - p. 721 - 734.
Department(s) Laboratory of Plant Physiology
Laboratory of Cell Biology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) dependent auxin gradients - vascular differentiation - phosphate starvation - apical dominance - acts downstream - transport - efflux - initiation - thaliana - biosynthesis
Abstract In 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 phosphate-sufficient 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.
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