Association mapping for yield and grain quality traits in rice (Oryza sativa L.)
AUTOR(ES)
Borba, Tereza Cristina de Oliveira, Brondani, Rosana Pereira Vianello, Breseghello, Flávio, Coelho, Alexandre Siqueira Guedes, Mendonça, João Antônio, Rangel, Paulo Hideo Nakano, Brondani, Claudio
FONTE
Genetics and Molecular Biology
DATA DE PUBLICAÇÃO
09/07/2010
RESUMO
Association analysis was applied to a panel of accessions of Embrapa Rice Core Collection (ERiCC) with 86 SSR and field data from two experiments. A clear subdivision between lowland and upland accessions was apparent, thereby indicating the presence of population structure. Thirty-two accessions with admixed ancestry were identified through structure analysis, these being discarded from association analysis, thus leaving 210 accessions subdivided into two panels. The association of yield and grain-quality traits with SSR was undertaken with a mixed linear model, with markers and subpopulation as fixed factors, and kinship matrix as a random factor. Eight markers from the two appraised panels showed significant association with four different traits, although only one (RM190) maintained the marker-trait association across years and cultivation. The significant association detected between amylose content and RM190 was in agreement with previous QTL analyses in the literature. Herein, the feasibility of undertaking association analysis in conjunction with germplasm characterization was demonstrated, even when considering low marker density. The high linkage disequilibrium expected in rice lines and cultivars facilitates the detection of marker-trait associations for implementing marker assisted selection, and the mining of alleles related to important traits in germplasm.
Documentos Relacionados
- Epistasis for Three Grain Yield Components in Rice (Oryza Sativa L.)
- CRESCIMENTO E DESENVOLVIMENTO DE GENÓTIPOS DE ARROZ (Oryza sativa L.) E DE BIÓTIPOS DE ARROZ VERMELHO (Oryza sativa L.).
- Rice genetic resources (Oryza sativa L.) in southern Brazil.
- Evaluation of genetic resources for hybrid rice (Oryza sativa L.) production
- Evaluation of Pseudomonas fluorescens for Suppression of Sheath Rot Disease and for Enhancement of Grain Yields in Rice (Oryza sativa L.)