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Brassinosteroids promote root growth in Arabidopsis

, : Brassinosteroids promote root growth in Arabidopsis. Plant Physiology 133(3): 1261-1271

Although brassinosteroids (BRs) are known to regulate shoot growth, their role in the regulation of root growth is less clear. We showed that low concentrations of BRs such as 24-epicastasterone and 24-epibrassinolide promote root elongation in Arabidopsis thaliana wild-type plants up to 50% and in BR-deficient mutants such as dwf1-6 (cbb1) and cbb3 (which is allelic to cpd) up to 150%. The growth-stimulating effect of exogenous BRs was not reduced by the auxin transport inhibitor 2,3,5-triidobenzoic acid. BR-deficient mutants showed normal gravitropism, and 2,3,5-triidobenzoic acid or higher concentrations of 2,4-dichlorophenoxyacetic acid and naphtaleneacetic acid inhibited the root growth in the mutants to the same extent as in wild-type plants. Simultaneous administration of 24-epibrassinolide and 2,4-dichlorophenoxyacetic acid resulted in largely additive effects. Exogenous gibberellins did not promote root elongation in the BR-deficient mutants, and the sensitivity to the ethylene precursor 1-aminocyclopropane-1-carboxylic acid was not altered. Thus, the root growth-stimulating effect of BRs appeared to be largely independent of auxin and gibberellin action. Furthermore, we analysed BR interactions with other phytohormones on the gene expression level. Only a limited set of auxin- and ethylene-related genes showed altered expression levels. Genes related to other phytohormones barely showed changes, providing further evidence for an autonomous stimulatory effect of BR on root growth.


PMID: 14526105

DOI: 10.1104/pp.103.028662

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