Study On Genetic Diversity Of Rare Or Endangered Species Ulmus Elongata L.k Fu Et C.s Ding

Ulmus elongata L.K Fu et C.S Ding as one rare and endangered species of Ulmus and second level of national protection plant and only a few quantity distribution in our country. Because of natural factors and human activities, in recent years,the distribution of Ulmus elongata is narrow, the habitat fragmentated, genetic drift phenomena seriously,and the species now is endanger. Therefore, from the angle of protected the species diversity and biodiversity, a rare and endangered species protection,the relative action is an urgent task.This paper Based on the ISSR molecular markers analyze by 67 samples Ulmus elongata in the group of five popultation comes from 3 provinces in china ,using 8 primers for DNA amplification was screened out.The bands results shows the main genetic diversity of Ulmus elongata exist within population,and geneflow is limited. the highest level of genetic diversity in gutianshan nature reserve (G) ,PPB=78.5%,I=0.5177,Hs=0.3493,Ht=0.3486; and the Ulmus elongata population of songyang heshantou (H) is lowest level PPB=67.3%,I=0.4430,Hs=0.4056,Ht=0.3854.The among the populations genetic diversity of populations in zhejiang province have more than outside the Zhejiang province .the all points average genetic variation between 5 populations Ht =0.4221 for Ulmus elongata, Hs=0.3262, the average genetic distribution index Gst =0.2271,that shows genetic variation among population gets 22.71%.the gene flow Nm =0.7015 ,which shows the extent of geneflow is limitted. It may caused by destruction of habitats,habitat fragmentation duce to geographical isolation, and tend to rely on the interior evolutionary.It is suggest the natural population of Ulmus elongata should be protect by situ-conservation, and enhance the gene flow frequency between each populations, conserver its genetic diversity utmostly.