柳枝稷(Panicum virgatum L.)是一种重要的木质纤维作物,但其高木质素含量严重制约了其作为能源植物的开发和利用.以柳枝稷茎秆中的mRNA为模板,采用RT PCR方法克隆得到控制G/S木质素单体相互转化的关键酶基因F5H家族的2个基因,分别命名为PvF5H1与PvF5H2,将这2个基因序列提交到GenBank,登录号分别为JQ430747与JQ430748.DNAMAN序列分析表明,这2个基因的核酸序列相似性为93％,氨基酸序列相似性为90％.利用NCBI在线比对功能对这2个基因的生物学信息进行分析,结果表明:该基因通过生物学方法分析的编码蛋白质与玉米(Zea mays)的同源性最高,系统进化树分析也表明,其与玉米的亲缘关系最近.利用实时荧光定量PCR技术研究这2个基因在机械伤害胁迫下的表达趋势,结果表明:在伤害胁迫下,PvF5H1与PvF5H2基因都快速响应,并且在一定时间内,这种响应呈现正相关,其变化趋势一致,但是表达量及其变化相差较大.推测它们在柳枝稷应答伤害胁迫的过程中起重要作用.%Switchgrass (Panicum virgatum L. ) is an important lignocellulosic crop. High lignin content seriously limits its utilization as an energy plant. The partial fragments of F5H genes involved in G/S lig-nin monomer conversion were amplified from switchgrass bark mRNA using RT-PCR and designated as PvFoHl and PvF5H2 respectively (GenBank accession number: JQ430747 and JQ430748). DNAMAN sequence analysis of both genes indicated that the similarity of nucleic acid sequence reached 93% and the similarity of protein sequence reached 90%. NCBI Blast online was performed to analyze the biological in-formation of both PvF5Hl and PvF5H2. Sequence analyzed through biological methods showed that en-coded polypeptides were highly homologous to F5H proteins of Zea mays. Phylogenetic tree analysis also demonstrated that both genes were related to the F5H gene from Zea mays. Real-time quantitative PCR (qPCR) was performed to investigate the expression profiles of both PvF5Hl and PυFSHZ under wound stress. The results of qPCR analysis revealed that both PυF5H1and PυF5H2 showed fast-response and up-regulated expression under wound stress. PυF5H1 and PυF5H2 had different expression level with similar changing tendency.
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