Data/hora: 10/06/2024 06:40:21

Provedor de dados: | Bragantia
País: | Brazil
Título: | Genetic variability and homozygosity in a F4 castor bean population by microsatellite markers
Autores: | Machado,Edna Lobo; Silva,Simone Alves; Fernandes,Luciel dos Santos; Brasileiro,Helison Santos.
Data: | 2016-09-01
Ano: | 2016
Palavras-chave: | Ricinus communis L.; Breeding; Selection.
Resumo: | ABSTRACT The objectives of this study were to identify the genetic variability and estimate the level of homozygosity in a castor bean F4 population using microsatellite markers (SSR). To this end, it was performed the genotyping of the population through 53 pairs of SSR primers. Allele frequencies were estimated by number of alleles per locus, expected heterozygosity (He), observed heterozygosity (Ho) and polymorphic information content (PIC). An array of genetic dissimilarity was generated by Nei and Li index, and hierarchical cluster analysis was performed using the Unweighted Pair-Group Method Averages (UPGMA) method. Polymorphism was detected in a total of eight loci (15.09%) of the 53 evaluated, with the presence of two alleles per locus. Allele frequencies varied between 0.71 and 0.53, and the PIC, between 0.32 and 0.37. The average observed heterozygosity Ho (0.30) was lower than the expected heterozygosity He (0.47). Five dissimilar groups were formed, showing that there is genetic variability among the evaluated genotypes. The highest genetic dissimilarity was 0.708 and the lowest, 0.00. The percentages of homozygous genotypes varied from 25 to 75%. These results show that controlled selfing in castor bean raises the level of homozygosity, important for the breeding program.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300307
Editor: | Instituto Agronômico de Campinas
Relação: | 10.1590/1678-4499.536
Formato: | text/html
Fonte: | Bragantia  v.75 n.3 2016
Fonte: | info:eu-repo/semantics/openAccess