In order to observe genomic DNA in clone procedure with electron microscope,the EM molecular display technique has been used.Using TMV RNA as template,TMV cDNA was synthesized by AMV reverse transcriptase.The synthesized cDNA was then amplified by polymerase chain reaction (PCR).It was cloned in PBS Plasmid. Electron microscopic observation proved that three kinds of PBS DNA:superhelix DNA,open circular DNA or linear DNA were found,they were about 1 00μm in length,the virus coat protein genome in rod shape...