SRAP Markers of Cratoneuron f ilicinum(Hedw .) Spruce Diversity
The genetic diversity of 13 samples of Cratoneuron f ilicinum(Hedw .) Spruce collected in different regions in China is analyzed by SRAP molecular marker technique .The results show that 15 stable and highly reproducible primers amplify 162 polymorphic bands ,161 bands have polymorphism ,and the average percentage of polymorphism reaches to 99 . 49% ,which indicate the rich genetic variation of Cratoneuron f ilicinum .Using the software POPGENE-32 ,it shows that the average allele number Na is 1 .9938 ,the effective allele number Ne is 1 .6248 ,Nei's gene diversity index H is 0 .3606 , Shannon's information index is 0 .5366 ,and the genetic differentiation coefficient is 0 .5736 ,these state that the genetic variation of Cratoneuron f ilicinum mainly occurs among populations .The cluster analysis on the genetic relationships among 14 samples by UPG-MA method with the software NTSYS2 .1 shows that there is no correlation between the genetic distance and geographic distance of the samples .