Back to Search
Start Over
Mapping QTL main and interaction influences on milling quality in elite US rice germplasm
- Source :
- Theoretical and Applied Genetics. 122:291-309
- Publication Year :
- 2010
- Publisher :
- Springer Science and Business Media LLC, 2010.
-
Abstract
- Rice (Oryza sativa L.) head-rice yield (HR) is a key export and domestic quality trait whose genetic control is poorly understood. With the goal of identifying genomic regions influencing HR, quantitative-trait-locus (QTL) mapping was carried out for quality-related traits in recombinant inbred lines (RILs) derived from crosses of common parent Cypress, a high-HR US japonica cultivar, with RT0034, a low-HR indica line (129 RILs) and LaGrue, a low-HR japonica cultivar (298 RILs), grown in two US locations in 2005-2007. Early heading increased HR in the Louisiana (LA) but not the Arkansas (AR) location. Fitting QTL-mapping models to separate QTL main and QTL × environment interaction (QEI) effects and identify epistatic interactions revealed six main-effect HR QTLs in the two crosses, at four of which Cypress contributed the increasing allele. Multi-QTL models accounted for 0.36 of genetic and 0.21 of genetic × environment interaction of HR in MY1, and corresponding proportions of 0.25 and 0.37 in MY2. The greater HR advantage of Cypress in LA than in AR corresponded to a genomewide pattern of opposition of HR-increasing QTL effects by AR-specific effects, suggesting a selection strategy for improving this cultivar for AR. Treating year-location combinations as independent environments resulted in underestimation of QEI effects, evidently owing to lower variation among years within location than between location. Identification of robust HR QTLs in elite long-grain germplasm is suggested to require more detailed attention to the interaction of plant and grain development parameters with environmental conditions than has been given to date.
- Subjects :
- Crops, Agricultural
Germplasm
Arkansas
Oryza sativa
Quantitative Trait Loci
Chromosome Mapping
Oryza
General Medicine
Quantitative trait locus
Biology
Louisiana
biology.organism_classification
Chromosomes, Plant
Japonica
Phenotype
Inbred strain
Agronomy
Seeds
Genetics
Epistasis
Inbreeding
Cultivar
Cypress
Agronomy and Crop Science
Biotechnology
Subjects
Details
- ISSN :
- 14322242 and 00405752
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Theoretical and Applied Genetics
- Accession number :
- edsair.doi.dedup.....47de60aceb4d4e57e2ba3a623f87d7c9