Poplar MYB Transcription Factors, PtrMYB3 and PtrMYB20, are Involved in the Regulation of Secondary Wall Biosynthesis

Dicot wood is mainly composed of cellulose, xylan and lignin, and its formation requires the coordinated regulation of their biosynthesis. In this report, we demonstrate that the poplar wood-associated MYB transcriptional activators, PtrMYB3 and PtrMYB20, activate the biosynthetic pathways of cellul...

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Published in:Plant and cell physiology 2010-06, Vol.51 (6), p.1084-1090
Main Authors: McCarthy, Ryan L, Zhong, Ruiqin, Fowler, Scott, Lyskowski, David, Piyasena, Hasanthi, Carleton, Kara, Spicer, Charles, Ye, Zheng-Hua
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - metabolism
Cell Wall - metabolism
Cellulose - biosynthesis
Gene Expression Regulation, Plant
Genes, myb
Phylogeny
Plant Proteins - genetics
Plant Proteins - metabolism
Plants, Genetically Modified - genetics
Plants, Genetically Modified - metabolism
Populus - genetics
Populus - metabolism
Populus trichocarpa
Promoter Regions, Genetic
RNA, Plant - genetics
Secondary wall
Transcription factor
Transcription Factors - genetics
Transcription Factors - metabolism
Transcriptional regulation
Wood - genetics
Wood - growth & development
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Summary:Dicot wood is mainly composed of cellulose, xylan and lignin, and its formation requires the coordinated regulation of their biosynthesis. In this report, we demonstrate that the poplar wood-associated MYB transcriptional activators, PtrMYB3 and PtrMYB20, activate the biosynthetic pathways of cellulose, xylan and lignin when overexpressed in Arabidopsis and they are also able to activate the promoter activities of poplar wood biosynthetic genes. We also show that PtrMYB3 and PtrMYB20 are functional orthologs of Arabidopsis MYB46 and MYB83, and their expression is directly activated by poplar PtrWND2, suggesting their involvement in the regulation of wood formation in poplar.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pcq064