WOX14 promotes bioactive gibberellin synthesis and vascular cell differentiation in Arabidopsis - PubMed (original) (raw)

. 2017 May;90(3):560-572.

doi: 10.1111/tpj.13513. Epub 2017 Mar 26.

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• PMID: 28218997
• DOI: 10.1111/tpj.13513

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WOX14 promotes bioactive gibberellin synthesis and vascular cell differentiation in Arabidopsis

Erwan Denis et al. Plant J. 2017 May.

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Abstract

Procambial and cambial stem cells provide the initial cells that allow the formation of vascular tissues. WOX4 and WOX14 have been shown to act redundantly to promote procambial cell proliferation and differentiation. Gibberellins (GAs), which have an important role in wood formation, also stimulate cambial cell division. Here we show that the loss of WOX14 function phenocopies some traits of GA-deficient mutants that can be complemented by exogenous GA application, whereas WOX14 overexpression stimulates the expression of GA3ox anabolism genes and represses GA2ox catabolism genes, promoting the accumulation of bioactive GA. More importantly, our data clearly indicate that WOX14 but not WOX4 promotes vascular cell differentiation and lignification in inflorescence stems of Arabidopsis.

Keywords: Arabidopsis thaliana; WOX; cambium; cell differentiation; gibberellin; inflorescence stem; xylem.

© 2017 The Authors The Plant Journal © 2017 John Wiley & Sons Ltd.

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