Comparative Genetic Diversity of Schlechtendalia Chinensis and Their Hosts Rhus Chinensis Population

The inter-simple sequence repeat(ISSR) maker was used to examine the genetic diversity and genetic differentiation of 8 Rhus chinensis populations from Guizhou Province,and meanwhile compared the genetic diversity with the Chinese gallnut aphid Schlechtendalia chinensis.R.chinensis is the unique primary host of Chinese gallnut aphid.11 ISSR primers were evaluated for their ability to produce polymorphic bands,and these primers yielded a tota1 of 171 scorable bands,among which 100% were polymorphic.Shannon diversity index and Nei's gene diversity has the similar results with the proportion of polymorphic loci.Compared the genetic index with that of S.chinensis and tested the correlation(P0.01),the results indicate that the diversity of R.chinensis has the same variation tendency with that of S.chinensis,and the genetic diversity of R.chinensis was higher than that of S.chinensis in case to the same population.Genetic differentiation coefficient was 22.94% and 19.26% between R.chinensis populations and S.chinensis,showing the similar differentiation.This should be mainly lie in their coevolution relationship.Cluster analysis showed that there was no direct correlation between genetic distance and geographic distance between them,and didn't form corresponding relation between populations,which maybe mainly result from the different species with different reproduction system.