Association mapping for yield and grain quality traits in rice (Oryza sativa L.).

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.

Bibliographic Details

Main Authors:	BORBA, T. C. de O., BRONDANI, R. P. V., BRESEGHELLO, F., COELHO, A. S. G., MENDONÇA, J. A., RANGEL, P. H. N., BRONDANI, C.
Other Authors:	TEREZA CRISTINA DE OLIVEIRA BORBA, CNPAF; ROSANA PEREIRA VIANELLO BRONDANI, CNPAF; FLAVIO BRESEGHELLO, CNPAF; ALEXANDRE SIQUEIRA GUEDES COELHO, UFG; JOAO ANTONIO MENDONCA, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF; CLAUDIO BRONDANI, CNPAF.
Format:	Artigo de periódico biblioteca
Language:	English eng
Published:	2010-09-09
Subjects:	Association analysis, Core collection, Genetic structure, Arroz, Oryza sativa, Recurso genético, Germoplasma, Rice, Germplasm conservation,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/862017 https://doi.org/10.1590/S1415-47572010005000065
Tags:	Add Tag No Tags, Be the first to tag this record!