Geographical Distribution Pattern And Population Genetics Of Picea Meyeri

Picea meyeri is a prevalent Picea meyeri in the mountainous area of Picea meyeri,which is characterized by large-scale glaciation during the Quaternary.As a result of global warming,Picea meyeri is retreating to a more favorable climate area.Therefore,the prediction of the past and future distribution of Picea meyeri by using the species distribution model can provide a theoretical basis for exploring the historical causes of the modern distribution pattern of species in North China.In this study,the Max Ent and Arcgis are used to predict the potential distribution of Picea meyeri.The genetic structure,genetic diversity and genetic differentiation of nine naturally distributed Picea meyeri populations are studied based on microsatellite markers.The main results are as follows:(1)The potential distribution model based on geographic data and climate varia bles suitable district research showed that over time,the most suitable district Piceameyeri to the northeast area is significantly reduced and migration of high latitudeand high altitude regions,and the main climate factor affecting the Picea meyeri p otential distribution is: the elevation of Alt,Precipitation of wettest month bio13,Is othermality bio3 and Annual mean temperature bio1.(2)The genetic diversity indices of SPL3AG1H4＿A and EAC2H08 are the highest in14 pairs of SSR primers of Picea meyeri.The indexes of genetic diversity of Wutai Mountain are relatively high,indicating good adaptive capacity and evolutionary potential of Picea meyeri.The genetic diversity index of Zhenglan Banner population in Inner Mongolia was the lowest and the genetic diversity was low.(3)The analysis of molecular variance showed that 79% of the total genetic va riation came from genetic variation within the population.The genetic differentiationcoefficient and gene exchange between Zhenglan Banner population and Saihanba population were the lowest and the most frequent,indicating that the genetic differe ntiation degree between the two populations was low and the genetic relationship w as recent.The genetic differentiation coefficient and gene exchange between Dashid ong population in Shanxi and Duolun County population in Inner Mongolia were th e highest and the lowest,indicating that Dashidong and Duolun populations had thehighest degree of genetic differentiation and the longest genetic relationship.(4)STRUCTURE and Principal Coordinate Analysis(PCo A)of 180 mast.Nine populations of Picea meyeri are clustered into two taxa,including Wuling Mountain,Dasidong,Jiufeng Mountain,Xiaowutai Mountain and Pangquangou.Duolun County of Inner Mongolia Zhenglan Banner of Inner Mongolia,Saihanba of Hebei province and Wutai Mountain of Shanxi Province are grouped into one group.(5)The genetic distance of Picea meyeri is significantly correlated with geographic distance under SNP marker,but not with SSR marker.