ABSTRACT
<p><b>OBJECTIVE</b>The genetic difference among Scrophularia ningpoensis cultivars were analyzed in molecular level.</p><p><b>METHOD</b>Ninety-two individuls of three S. ningpoensis cultivars were employed to be analyzed by the approach of Sequence-related Amplified Polymorphism (SRAP).The parameters were calculated by POPGENE1.31 and the relationship was constructed based on UPGMA method.</p><p><b>RESULT</b>1) A total of 227 bands were scored and 199 bands of them were polymorphic. 2) The result is showed that there is a medium level of genetic diversity among three cultivars. At species level: percentage of polymorphic loci PPB=52.42%, effective number of alleles N(e)=1.2812, Nei's gene diversity H=0.1671 and Shannon's information index H(sp)= 0.2526; At cultivar level: PPB=21.44%, N(e)=1.1216, Nei's gene diversity H=0.0725 and Shannon's information index H(pop)= 0.1083. 3) The Nei's coefficient of genetic differentiation was 0.5625, which was consistent with the Shannon's coefficient of genetic differentiation (0.5713). Most of the genetic variation existed among cultivars. 4) The gene flow (N(m)=0.3889) was less among cultivars, indicating that the degree of genetic differentiation was higher. 5) Genetic similarity coefficient were changed from 0.8082 to 0.9133. By clustering analysis, the classified result of SRAP marker between traditional modal character was almost same.</p><p><b>CONCLUSION</b>The genetic diversity of samples of S. ningpoensis is medium. The genetic difference among cultivar is higher than that within cultivar.</p>
Subject(s)
Cluster Analysis , DNA Primers , Genetics , Gene Flow , Genetic Markers , Genetics , Genetic Variation , Nucleic Acid Amplification Techniques , Methods , Polymerase Chain Reaction , Polymorphism, Genetic , Scrophularia , Classification , Genetics , SoftwareABSTRACT
<p><b>OBJECTIVE</b>To study the genetic diversity of Codonopsis tangshen.</p><p><b>METHOD</b>Eighteen germplasmic resources of C. tangshen were analyzed by SRAP and ISSR molecular markers. The systematic diagram of genetic relationship was made by TREECONW software and clustered by UPGMA method.</p><p><b>RESULT</b>Twenty-nine SRAP primer combination amplified 329 bands with 266 (80.85%) polymorphic and 21 ISSR primers amplified 223 bands with 166 (74.44%) polymorphic. The average genetic similarity coefficient was 0.7121 (by SRAPs) and 0.7781 (by ISSRs). Both SRAP and ISSR analyses revealed a high level of genetic diversity in C. tangshen. By cluster analysis, the geographical distribution was not distinctive. The significant positive correlation between SRAPs and ISSRs was observed (r=0.802, P<0.01), although the dendrograms based on SRAP and ISSR markers were not all the same.</p><p><b>CONCLUSION</b>Different germplasms diversity of C. tangshen is high and SRAP and ISSR can be used in genetic diversity study of C. tangshen.</p>