We analyzed the genetic differences of 16 poplar clones between genomic-SSR and EST-SSR markers. The statistical results show that the average number of alleles detected by genomic-SSR was 4.1, Shannon＇s index 1.0646...We analyzed the genetic differences of 16 poplar clones between genomic-SSR and EST-SSR markers. The statistical results show that the average number of alleles detected by genomic-SSR was 4.1, Shannon＇s index 1.0646, observed heterozygos- ity 0.4427 and expected heterozygosity 0.5523, while for the EST-SSR, the average number of alleles was 2.8, Shannon＇s index 0.6985, observed heterozygosity 0.2330 and expected heterozygosity 0.4684. Cluster analysis indicated that the EST-SSR capacity of genotypic identification was more precise than that of genomic-SSR. These resuks reveal that EST-SSR and genomic-SSR have statistically significant genetic differences in polymorphism detection and genotypic identification. These differences could provide a theoretical basis for the rational use of SSR markers in species diversity and other related research.展开更多
Simple sequence repeat （SSR） markers have been shown to be a powerful tool for varieties identification in plants. How- ever, SSR fingerprinting of sweetpotato varieties has been a little reported. In this study, a ...Simple sequence repeat （SSR） markers have been shown to be a powerful tool for varieties identification in plants. How- ever, SSR fingerprinting of sweetpotato varieties has been a little reported. In this study, a total of 1 294 SSIR primer pairs, including 1 215 genomic-SSR and 79 expressed sequence tag （EST）-SSR primer pairs, were screened with sweetpotato varieties Zhengshu 20 and Luoxushu 8 and their 2 F1 individuals randomly sampled, and 273 and 38 of them generated polymorphic bands, respectively. Four genomic-SSR and 3 EST-SSR primer pairs, which showed good polymorphism, were selected to amplify 203 sweetpotato varieties and gave a total of 172 bands, 85 （49.42%） of which were polymorphic. All of the 203 sweetpotato varieties showed unique fingerprint patterns, indicating the utility of SSR markers in variety iden- tification of this crop. Polymorphism information content （PIC） ranged from 0.5824 to 0.9322 with an average of 0.8176. SSR-based genetic distances varied from 0.0118 to 0.6353 with an average of 0.3100 among these varieties. Thus, these sweetpotato varieties exhibited high levels of genetic similarity and had distinct fingerprint profiles. The SSR fingerprints of the 203 sweetpotato varieties have been successfully constructed. The highly polymorphic SSR primer pairs developed in this study have the potential to be used as core primer pairs for variety identification, genetic diversity assessment and linkage map construction in sweetpotato and other plants.展开更多
Indo-Burmese region was the primary center of eggplant diversity from where the crop extended to several secondary origins of diversity.In this study,the genetic diversity among fifty-six eggplant accessions collected...Indo-Burmese region was the primary center of eggplant diversity from where the crop extended to several secondary origins of diversity.In this study,the genetic diversity among fifty-six eggplant accessions collected from three countries was assessed using sixteen polymorphic SSR markers to determine suitable parents for heterotic hybridization.The estimation of genetic diversity among the population of three countries(Bangladesh,Malaysia,and Thailand)varied from 0.57 to 0.74,with Shannon’s index value of 0.65.The mean value of expected heterozygosity and Nei’s index was 0.49,with an average PIC value of 0.83.A dendrogram was constructed based on UPGMA(unweighted pair group method with arithmetic mean),and the dendrogram categorized all accessions into six groups.The AMOVA(analysis of molecular variance)revealed a 77%total variation within the population from three different countries and 23%total variation among the populations.The result revealed a high genetic differentiation among the eggplant germplasms while the accessions that are farther from each other show a high level of diversity;thus,they can be recommended as parental in breeding programs.Hence,accessions,EB12,ET11,ET13,ET15,ET16,and ET17 could be crossed with accessions EM3,EB34,and EB3 for improvement in the future breeding program.展开更多
基金support provided by the National Department Public Benefit Research Foundation(No.201004009)the National High Technology Research and Development Program of China(863Program,No.2009AA10Z107)
文摘We analyzed the genetic differences of 16 poplar clones between genomic-SSR and EST-SSR markers. The statistical results show that the average number of alleles detected by genomic-SSR was 4.1, Shannon＇s index 1.0646, observed heterozygos- ity 0.4427 and expected heterozygosity 0.5523, while for the EST-SSR, the average number of alleles was 2.8, Shannon＇s index 0.6985, observed heterozygosity 0.2330 and expected heterozygosity 0.4684. Cluster analysis indicated that the EST-SSR capacity of genotypic identification was more precise than that of genomic-SSR. These resuks reveal that EST-SSR and genomic-SSR have statistically significant genetic differences in polymorphism detection and genotypic identification. These differences could provide a theoretical basis for the rational use of SSR markers in species diversity and other related research.
基金supported by the earmarked fund for the China Agriculture Research System (CARS-11)the National Natural Science Foundation of China (31461143017)the Science andTechnology Planning Project of Guangdong Province,China (2015B020202008)
文摘Simple sequence repeat （SSR） markers have been shown to be a powerful tool for varieties identification in plants. How- ever, SSR fingerprinting of sweetpotato varieties has been a little reported. In this study, a total of 1 294 SSIR primer pairs, including 1 215 genomic-SSR and 79 expressed sequence tag （EST）-SSR primer pairs, were screened with sweetpotato varieties Zhengshu 20 and Luoxushu 8 and their 2 F1 individuals randomly sampled, and 273 and 38 of them generated polymorphic bands, respectively. Four genomic-SSR and 3 EST-SSR primer pairs, which showed good polymorphism, were selected to amplify 203 sweetpotato varieties and gave a total of 172 bands, 85 （49.42%） of which were polymorphic. All of the 203 sweetpotato varieties showed unique fingerprint patterns, indicating the utility of SSR markers in variety iden- tification of this crop. Polymorphism information content （PIC） ranged from 0.5824 to 0.9322 with an average of 0.8176. SSR-based genetic distances varied from 0.0118 to 0.6353 with an average of 0.3100 among these varieties. Thus, these sweetpotato varieties exhibited high levels of genetic similarity and had distinct fingerprint profiles. The SSR fingerprints of the 203 sweetpotato varieties have been successfully constructed. The highly polymorphic SSR primer pairs developed in this study have the potential to be used as core primer pairs for variety identification, genetic diversity assessment and linkage map construction in sweetpotato and other plants.
基金the Malaysia Ministry of Education’s for the Long-Term Research Grant Scheme(LRGS)on Sustainable vegetable production technology for food security in urban agriculture(LRGS/1/2019/UKM/01/5/4).
文摘Indo-Burmese region was the primary center of eggplant diversity from where the crop extended to several secondary origins of diversity.In this study,the genetic diversity among fifty-six eggplant accessions collected from three countries was assessed using sixteen polymorphic SSR markers to determine suitable parents for heterotic hybridization.The estimation of genetic diversity among the population of three countries(Bangladesh,Malaysia,and Thailand)varied from 0.57 to 0.74,with Shannon’s index value of 0.65.The mean value of expected heterozygosity and Nei’s index was 0.49,with an average PIC value of 0.83.A dendrogram was constructed based on UPGMA(unweighted pair group method with arithmetic mean),and the dendrogram categorized all accessions into six groups.The AMOVA(analysis of molecular variance)revealed a 77%total variation within the population from three different countries and 23%total variation among the populations.The result revealed a high genetic differentiation among the eggplant germplasms while the accessions that are farther from each other show a high level of diversity;thus,they can be recommended as parental in breeding programs.Hence,accessions,EB12,ET11,ET13,ET15,ET16,and ET17 could be crossed with accessions EM3,EB34,and EB3 for improvement in the future breeding program.
