RRC ID 11407
著者 Bhargava A, Mansfield SD, Hall HC, Douglas CJ, Ellis BE.
タイトル MYB75 functions in regulation of secondary cell wall formation in the Arabidopsis inflorescence stem.
ジャーナル Plant Physiol
Abstract Deposition of lignified secondary cell walls in plants involves a major commitment of carbon skeletons in both the form of polysaccharides and phenylpropanoid constituents. This process is spatially and temporally regulated by transcription factors, including a number of MYB family transcription factors. MYB75, also called PRODUCTION OF ANTHOCYANIN PIGMENT1, is a known regulator of the anthocyanin branch of the phenylpropanoid pathway in Arabidopsis (Arabidopsis thaliana), but how this regulation might impact other aspects of carbon metabolism is unclear. We established that a loss-of-function mutation in MYB75 (myb75-1) results in increased cell wall thickness in xylary and interfascicular fibers within the inflorescence stem. The total lignin content and S/G ratio of the lignin monomers were also affected. Transcript profiles from the myb75-1 inflorescence stem revealed marked up-regulation in the expression of a suite of genes associated with lignin biosynthesis and cellulose deposition, as well as cell wall modifying proteins and genes involved in photosynthesis and carbon assimilation. These patterns suggest that MYB75 acts as a repressor of the lignin branch of the phenylpropanoid pathway. Since MYB75 physically interacts with another secondary cell wall regulator, the KNOX transcription factor KNAT7, these regulatory proteins may form functional complexes that contribute to the regulation of secondary cell wall deposition in the Arabidopsis inflorescence stem and that integrate the metabolic flux through the lignin, flavonoid, and polysaccharide pathways.
巻・号 154(3)
ページ 1428-38
公開日 2010-11-1
DOI 10.1104/pp.110.162735
PII pp.110.162735
PMID 20807862
PMC PMC2971618
MeSH Arabidopsis / genetics* Arabidopsis / metabolism Arabidopsis Proteins / genetics Arabidopsis Proteins / metabolism* Cell Wall / metabolism* Gene Expression Profiling Gene Expression Regulation, Plant Inflorescence / cytology Lignin / biosynthesis Mutation Oligonucleotide Array Sequence Analysis Plant Stems / cytology* RNA, Plant / genetics Transcription Factors / genetics Transcription Factors / metabolism* Transcriptional Activation
IF 6.902
引用数 105
WOS 分野 PLANT SCIENCES
リソース情報
シロイヌナズナ / 植物培養細胞・遺伝子 pst16228