300 clear bands including 289 polymorphic bands and 50 specific bands were amplified from the genomic dna of gastrodia elata bl . by these selected primers . the rate of polymorphic bands and the rate of specific bands were 98 . 0 % and 16 . 6 % respectively 6个引物组合共扩增出300条清晰可辨的条带,其中289条多态性条带, 50条特异性条带;多态性条带率和特异性条带率分别达98