Analysis Of The Genetic Diversity Of Wheat Cultivars In Shandong Province Since 1949

In order to learn the genetic diversity and evolution laws of wheat cultivars in Shandong province from 1950's, the wheat cultivars were analyzed by family tree coefficient, field agronomic and physiological datas and SSR marker technology, and the principal results are as follows:The study of relation analysis and genetic diversity among 2145 combinations of 66 winter wheat varieties in nine varieties updating of Shandong Province showed that relationship exists among 67.44% combinations, the range of COP value of all varieties is 0.00-0.8203 with the average value 0.06249, 21.53% pedigree Relation Coefficients(RC) high than the average. The RC of varieties of every year becomes bigger along with the time, fell in the 90's, and then increased again. The varieties RCs in each year are bigger than which between years, less between early and present varieties, while larger between medium-term and latter varieties. The variety genetic contribution of the same age decreases with the time. The result of clustering analysis on varieties COP values on basis of the WAP method showed that 63 varieties can be united into 6 big clusters based on different year, and the left three varieties, Xuzhou438,Qida195,Yannong 78 were made into a cluster at the value of 0. The RCs of the 17 varieties which have been extended many area and much long time in Shandong Province were little, with bigger genetic difference, and all those varieties were selected from overseas parents'combinations. The breeding genetic resources of Shandong Province can be traced back to four big core parents system of Biyu, Villa Glori(zhong nong 28), Luofulin and Youzi wheat on the ground of pedigree analysis. The genetic differences and diversity were little and little after 1950s.wheat cultivars and their principal parents from 1950's were investigated 23 morphological characters, 12 agronomic characters ,7 quality and physiological characters by field experiments and room analyse, indicating genetic diversity of different characters was remarkablely significant. The results of HMW-GS components analyse showed that the ratio of wheat cultivars composed of 5+10 HMW-GS increased. All in all, genetic diversity of Glu-B1 loca is the richest among the three locas, next Glu-D1 ,and Glu-A1 loca is the worst. . Means of polymorphic index of Glu-1 loca has declined since 1950's, and reached the lowest...