We have compared genetic diversity of 24 Chinese weak-winter, Swedish winter and spring B. napus accessions by inter-simple sequence repeats (ISSRs). By cluster analysis (UPGMA) based on 125 polymorphism bands amplifi...We have compared genetic diversity of 24 Chinese weak-winter, Swedish winter and spring B. napus accessions by inter-simple sequence repeats (ISSRs). By cluster analysis (UPGMA) based on 125 polymorphism bands amplified with 20 primers, the 24 accessions were divided into three groups. Six Swedish winter lines and eight Chinese weak-winter lines were in the group I and the groupⅡwere two Chinese weak-winter lines XiangyoulS and Bao81. The third group contained eight Swedish spring lines. Principal co-ordinates analysis (PCO) showed similar groupings to cluster analysis. Results from cluster analysis and PCO analysis showed very clearly that Chinese weak-winter, Swedish spring and winter accessions were distinguished from each other and Chinese weak-winter accessions in this study were genetically closer to Swedish winter accessions than to Swedish spring accessions. The Chinese weak-winter accessions had larger diversity than Swedish spring or winter accessions did. This study indicated that ISSR is a suitable and effective tool to evaluate genetic diversity among rapeseed germplasm.展开更多
In order to identify the variation and estimate the genetic diversity among the fig (Ficus carica L.) genotypes collected from Algeria and Turkey, the genetic relationships between 86 genotypes were investigated using...In order to identify the variation and estimate the genetic diversity among the fig (Ficus carica L.) genotypes collected from Algeria and Turkey, the genetic relationships between 86 genotypes were investigated using 23 inter primer binding sites (iPBS)-retrotransposon and 16 simple sequence repeat (SSR) primers. A total of 63 polymorphic bands for the iPBS-retrotransposon markers and 25 alleles for the SSR markers were identified with an average of 2.7 and 1.6 per primer, respectively. The average value of polymorphism information content (PIC) for the iPBS markers (0.73) was higher than that for the SSR markers (0.69). Applying the neighbor-joining method to the combined iPBS-retrotransposon and SSR data, the fig genotypes were clustered into two groups. The STRUCTURE software was used to determine the population structure. Among the genotypes studied, two populations (K = 2) were identified indicating a low diversity between the Algerian and Turkish varieties. Both types of markers were able to differentiate all the fig genotypes and were efficient in discriminating the closely related genotypes. Our data also showed that as a universal marker, iPBS-retrotransposon is a useful tool for the molecular characterization of fig genotypes.展开更多
文摘We have compared genetic diversity of 24 Chinese weak-winter, Swedish winter and spring B. napus accessions by inter-simple sequence repeats (ISSRs). By cluster analysis (UPGMA) based on 125 polymorphism bands amplified with 20 primers, the 24 accessions were divided into three groups. Six Swedish winter lines and eight Chinese weak-winter lines were in the group I and the groupⅡwere two Chinese weak-winter lines XiangyoulS and Bao81. The third group contained eight Swedish spring lines. Principal co-ordinates analysis (PCO) showed similar groupings to cluster analysis. Results from cluster analysis and PCO analysis showed very clearly that Chinese weak-winter, Swedish spring and winter accessions were distinguished from each other and Chinese weak-winter accessions in this study were genetically closer to Swedish winter accessions than to Swedish spring accessions. The Chinese weak-winter accessions had larger diversity than Swedish spring or winter accessions did. This study indicated that ISSR is a suitable and effective tool to evaluate genetic diversity among rapeseed germplasm.
文摘In order to identify the variation and estimate the genetic diversity among the fig (Ficus carica L.) genotypes collected from Algeria and Turkey, the genetic relationships between 86 genotypes were investigated using 23 inter primer binding sites (iPBS)-retrotransposon and 16 simple sequence repeat (SSR) primers. A total of 63 polymorphic bands for the iPBS-retrotransposon markers and 25 alleles for the SSR markers were identified with an average of 2.7 and 1.6 per primer, respectively. The average value of polymorphism information content (PIC) for the iPBS markers (0.73) was higher than that for the SSR markers (0.69). Applying the neighbor-joining method to the combined iPBS-retrotransposon and SSR data, the fig genotypes were clustered into two groups. The STRUCTURE software was used to determine the population structure. Among the genotypes studied, two populations (K = 2) were identified indicating a low diversity between the Algerian and Turkish varieties. Both types of markers were able to differentiate all the fig genotypes and were efficient in discriminating the closely related genotypes. Our data also showed that as a universal marker, iPBS-retrotransposon is a useful tool for the molecular characterization of fig genotypes.
