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• W2263503831 abstract "Abstract Wood is formed by the successive addition of secondary xylem, which consists of cells with a conspicuously thickened secondary wall composed mainly of cellulose, xylan and lignin. Currently, few transcription factors involved in the direct regulation of secondary wall biosynthesis have been characterized in tree species. Here, we show that PdMYB221, a poplar ortholog of the Arabidopsis R2R3-MYB transcription factor AtMYB4, directly regulates secondary wall biosynthesis during wood formation. PdMYB221 is predominantly expressed in cells of developing wood and the protein it encodes localizes to the nucleus and acts as a transcriptional repressor. Ectopic expression of PdMYB221 resulted in reduced cell wall thicknesses of fibers and vessels in Arabidopsis inflorescence stems. The amounts of cellulose, xylose and lignin were decreased and the expression of key genes synthesizing the three components was suppressed in PdMYB221 overexpression plants. Transcriptional activation assays showed that PdMYB221 repressed the promoters of poplar PdCESA7/8 , PdGT47C , PdCOMT2 and PdCCR1 . Electrophoretic mobility shift assays revealed that PdMYB221 bound directly to the PdCESA8 , PdGT47C and PdCOMT2 promoters. Together, our results suggest that PdMYB221 may be involved in the negative regulation of secondary wall formation through the direct and indirect suppression of the gene expression of secondary wall biosynthesis." @default.
• W2263503831 created "2016-06-24" @default.
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• W2263503831 date "2015-07-16" @default.
• W2263503831 modified "2023-09-25" @default.
• W2263503831 title "Poplar PdMYB221 is involved in the direct and indirect regulation of secondary wall biosynthesis during wood formation" @default.
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• W2263503831 doi "https://doi.org/10.1038/srep12240" @default.
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