Gemstones have fascinated mankind forever,and people traveled far to find them.The Silk Road is one of the most traditional trade routes in the middle ages that was used to bring the precious stones to the European ma...Gemstones have fascinated mankind forever,and people traveled far to find them.The Silk Road is one of the most traditional trade routes in the middle ages that was used to bring the precious stones to the European market.Later,emeralds from Colombia were shipped via the ocean to the Old World.展开更多
Growth traits and genetic diversity of 23 provenances of Quercus rubra introduced from North America were analyzed in a provenance trial established with a randomized block design in Hwaseong,Gyeonggi,South Korea in 1...Growth traits and genetic diversity of 23 provenances of Quercus rubra introduced from North America were analyzed in a provenance trial established with a randomized block design in Hwaseong,Gyeonggi,South Korea in 1993.Growth variables and survival at age 25 were compared with results from early stages.Height,DBH,volume and stem straightness of Q.rubra was better than those of the domestic oak(Quercus accutissima).Growth of the Dunham Island provenance from New York was the best among the 23 provenances that of the Eagle River provenance from Wisconsin was poorest.Survival rate at age25 was on average 52%.The longitude of seed origin and growth of provenance were consistently significantly negatively correlated at all ages.Growth of coastal provenances was superior to that of the inland provenances,which were separated by the Appalachian Mountains.Genetic diversity and genetic distance among the provenances were evaluated using micro satellite markers.The allelic frequencies showed high polymorphism in 10 microsatellite loci,and 292 alleles were found.Of 10 loci,two were commonly found in the 23 provenances.The mean allelic diversity and heterozygosity observed among the provenances were similar to those from the native populations of Q.rubra in North America.Nei’s genetic distance among the 23 was estimated and showed that a clear trend between geographic and genetic distances,indicating that some provenances have high genetic diversity with superior growth performance.展开更多
文摘Gemstones have fascinated mankind forever,and people traveled far to find them.The Silk Road is one of the most traditional trade routes in the middle ages that was used to bring the precious stones to the European market.Later,emeralds from Colombia were shipped via the ocean to the Old World.
基金supported by a research project(No.FTIS 2014109B0-1820-AA01)of Korea Forest Service and the Seoul National University Carbon Sink Graduate Program provided by Korea Forest Service&Korea Forestry Promotion Institute。
文摘Growth traits and genetic diversity of 23 provenances of Quercus rubra introduced from North America were analyzed in a provenance trial established with a randomized block design in Hwaseong,Gyeonggi,South Korea in 1993.Growth variables and survival at age 25 were compared with results from early stages.Height,DBH,volume and stem straightness of Q.rubra was better than those of the domestic oak(Quercus accutissima).Growth of the Dunham Island provenance from New York was the best among the 23 provenances that of the Eagle River provenance from Wisconsin was poorest.Survival rate at age25 was on average 52%.The longitude of seed origin and growth of provenance were consistently significantly negatively correlated at all ages.Growth of coastal provenances was superior to that of the inland provenances,which were separated by the Appalachian Mountains.Genetic diversity and genetic distance among the provenances were evaluated using micro satellite markers.The allelic frequencies showed high polymorphism in 10 microsatellite loci,and 292 alleles were found.Of 10 loci,two were commonly found in the 23 provenances.The mean allelic diversity and heterozygosity observed among the provenances were similar to those from the native populations of Q.rubra in North America.Nei’s genetic distance among the 23 was estimated and showed that a clear trend between geographic and genetic distances,indicating that some provenances have high genetic diversity with superior growth performance.
