中国核桃8个天然居群遗传多样性分析

Eight Juglans populations （4 populations of J. sigillata and 4 of J. regia）, which are distributed in Yunnan, Sichuan, Henan, and Shanxi Province, were selected to investigate their genetic structure and diversity using 8 microsatellite loci. A moderate level of genetic diversity was observed at population level by the total 71 of alleles. The mean expected heterozygosity （He） of all populations was 0.618. The proportion of genetic differentiation among populations accounted for 19.6% of the whole diversity, and the gene flow between populations （Nm） was 1.02. The result of UPGMA clustering indicated that the populations were congregated according to their geographic distances instead of tree species.