title: Linkages and Interactions Analysis of Major Effect Drought Grain Yield QTLs in Rice.
abstract: Quantitative trait loci conferring high grain yield under drought in rice are important genomic resources for climate resilient breeding. Major and consistent drought grain yield QTLs usually co-locate with flowering and/or plant height QTLs, which could be due to either linkage or pleiotropy. Five mapping populations used for the identification of major and consistent drought grain yield QTLs underwent multiple-trait, multiple-interval mapping test (MT-MIM) to estimate the significance of pleiotropy effects. Results indicated towards possible linkages between the drought grain yield QTLs with co-locating flowering and/or plant height QTLs. Linkages of days to flowering and plant height were eliminated through a marker-assisted breeding approach. Drought grain yield QTLs also showed interaction effects with flowering QTLs. Drought responsiveness of the flowering locus on chromosome 3 (qDTY3.2) has been revealed through allelic analysis. Considering linkage and interaction effects associated with drought QTLs, a comprehensive marker-assisted breeding strategy was followed to develop rice genotypes with improved grain yield under drought stress.
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Prashant
authors.initials: P
authors.lastname: Vikram
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: B P Mallikarjuna
authors.initials: BP
authors.lastname: Swamy
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Shalabh
authors.initials: S
authors.lastname: Dixit
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Jennylyn
authors.initials: J
authors.lastname: Trinidad
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Ma Teresa
authors.initials: MT
authors.lastname: Sta Cruz
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Paul C
authors.initials: PC
authors.lastname: Maturan
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Modesto
authors.initials: M
authors.lastname: Amante
authors.affiliation: Plant Breeding Genetics and Biotechnology Division, International Rice Research Institute (IRRI), Los Baños, Metro Manila, Philippines.
authors.forename: Arvind
authors.initials: A
authors.lastname: Kumar
mesh_terms: D000465:Algorithms; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D055864:Droughts; D002523:Edible Grain / Q000235:genetics* / Q000254:growth & development; D004843:Epistasis, Genetic; D035264:Flowers / Q000235:genetics / Q000254:growth & development; D059647:Gene-Environment Interaction; D008040:Genetic Linkage; D058685:Genetic Pleiotropy; D005838:Genotype; D008957:Models, Genetic; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D010641:Phenotype; D040641:Quantitative Trait Loci / Q000235:genetics*; D013312:Stress, Physiological / Q000235:genetics