Ultrastructural study on the development of male gametophyte in Paeonia lactiflora High-level expression of Actin of Paeonia lactiflora in Escherichia coli Cloning and analysis of Actin from Paeonia lactiflora Activity of intrinsic inhibitor in seed of Paeonia lactiflora Cloning and expression analysis on Actin gene from Paeonia lactiflora Cloning and bioinformatic analysis of FPPS gene from Paeonia lactiflora