Comparison of Genetic Structures among Cryphonectria parasitica Populations from China,Japan and the USA Characteristic Analysis and Homology Alignment of EST-SNPs and Candidate Genes for Chestnut Blight Resistance of Castanea mollissima REVIEW OF CURRENT RESEARCH OF THE WORLD CASTANEA SPECIES AND IMPORTANCE OF GERMPLASM CONSERVATION OF CHINA NATIVE CASTANEA SPECIES THE RELATIONSHIP BETWEEN THE CHESTNUT RESISTANCE TO BLIGHT AND AMINO ACID