Isolation of 4-coumarate CoA Ligase Gene from Pennisetum purpureum cv.Huanan and Lignin Content Analysis of Transgenic Tobacco Plants Molecular Cloning、Correlation Analysis and expression studies of 4CL Gene in Ziziphus jujuba Mill.‘Wuhexiaozao’ RACE Clone and RNAi Transformation of Flax 4CL Gene Cloning and SNP Analysis of 4CL Gene in Larix kaempferi Hybrids and Their Parent Lines Allelic Variation in 4-coumarate:CoA ligase(4CL) Associated with Wood Properties of Larix olgensis SNP Analysis of 4CL Gene in Larix olgensis Henry Populations