Isolation and Expression Analysis of Two cDNAs Encoding C4H Homologues from Gossypium arboreum Cloning and expression analysis of cinnamate 4-hydroxylase (C4H) reductase gene from Aquilaria sinensis Cloning and Characterization of Cinnamate 4-hydroxylase(C4H)Genes from Osmanthus fragrans Cloning and Characterization of Cinnamate 4-hydroxylase(C4H)Genes from Osmanthus fragrans