Tissue Specificity Express Analysis of Methyltransferase Gene COMT and CCoAOMT in Cotton Analysis of Enzyme Activity and Lignin Content and Expression of CCoAOMT Gene in the Pericarp of‘Dangshan Suli’and Its Russet Mutant Transformation of Model Tobacco Variety WS38 with Antisense CCoAOMT cDNA of Boehmeria nivea Cloning of cDNA Encoding COMT from Chinese White Poplar (Populus tomentosa), Sequence Analysis and Specific Expression Cloning of cDNA Encoding CCoAOMT from Populus tomentosa and Down-regulation of Lignin Content in Transgenic Plant Expressing Antisense Gene (in English) Analysis of Enzyme Activity and Lignin Content and Expression of CCoAOMT Gene in the Pericarp of‘Dangshan Suli’and Its Russet Mutant Gene Cloning and Alternative Splicing of CCoAOMT Subfamily Genes from Eucalyptus camaldulensis Clone of Partial Sequence of Caffeoyl-CoA 3-O-Methyltransferase Gene in Ramie Cloning and Sequence Analysis of Partial Fragments of Critical Genes Involved in Flax Lignin Synthesis