小黑杨(Populus xiaohei T.S.Hwang ex C.Wang et Tung)花药离体培养获得单倍体植株,经14年的生长观察,发现花粉植株间表现出明显分离。选出19个株系进行田间比较试验,统计分析,结果发现材积生长差异显著。可从中选出优良株系加以利用,...小黑杨(Populus xiaohei T.S.Hwang ex C.Wang et Tung)花药离体培养获得单倍体植株,经14年的生长观察,发现花粉植株间表现出明显分离。选出19个株系进行田间比较试验,统计分析,结果发现材积生长差异显著。可从中选出优良株系加以利用,并提出杨树单倍体育种程序。展开更多
RAPD technique was used to detect the genetic relationship among seven Betula species.233 loci in total were amplified by using 14 random primers.The percentage of polymorphic loci varied from 12.02% to 36.91%,in whic...RAPD technique was used to detect the genetic relationship among seven Betula species.233 loci in total were amplified by using 14 random primers.The percentage of polymorphic loci varied from 12.02% to 36.91%,in which B.costata had the highest variation level.The dendrogram of genetic relationship was constructed on the basis of the genetic distances among species.According to genetic distance in more than 1.22,six species were clustered into two groups,where B.fruticosal was one group and others,including B.davurica,B.pendula,B.platyphylla,B.schmidtii and B.costata, were grouped together.It indicated that the result of genetic relationship obtained by RAPD technique was closely consistent with that classified by traditional morphological classification.The analysis of genetic relationship among Betula species would validly guide the parental selection and interspecies crossing for Betula species.展开更多
文摘RAPD technique was used to detect the genetic relationship among seven Betula species.233 loci in total were amplified by using 14 random primers.The percentage of polymorphic loci varied from 12.02% to 36.91%,in which B.costata had the highest variation level.The dendrogram of genetic relationship was constructed on the basis of the genetic distances among species.According to genetic distance in more than 1.22,six species were clustered into two groups,where B.fruticosal was one group and others,including B.davurica,B.pendula,B.platyphylla,B.schmidtii and B.costata, were grouped together.It indicated that the result of genetic relationship obtained by RAPD technique was closely consistent with that classified by traditional morphological classification.The analysis of genetic relationship among Betula species would validly guide the parental selection and interspecies crossing for Betula species.