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WOX 14 promotes bioactive gibberellin synthesis and vascular cell differentiation in Arabidopsis
Author(s) -
Denis Erwan,
Kbiri Nadia,
Mary Viviane,
Claisse Gaëlle,
Conde e Silva Natalia,
Kreis Martin,
Deveaux Yves
Publication year - 2017
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.13513
Subject(s) - arabidopsis , microbiology and biotechnology , gibberellin , cell growth , cell division , cellular differentiation , phenocopy , biology , catabolism , cell , mutant , chemistry , gene , botany , biochemistry , metabolism
Summary Procambial and cambial stem cells provide the initial cells that allow the formation of vascular tissues. WOX 4 and WOX 14 have been shown to act redundantly to promote procambial cell proliferation and differentiation. Gibberellins ( GA s), which have an important role in wood formation, also stimulate cambial cell division. Here we show that the loss of WOX 14 function phenocopies some traits of GA ‐deficient mutants that can be complemented by exogenous GA application, whereas WOX 14 overexpression stimulates the expression of GA 3ox anabolism genes and represses GA 2ox catabolism genes, promoting the accumulation of bioactive GA . More importantly, our data clearly indicate that WOX 14 but not WOX 4 promotes vascular cell differentiation and lignification in inflorescence stems of Arabidopsis.