Abstract
Grain size affects the yield and quality of rice. The large grain line (LGL), showing a large grain size and japonica-like genome, was selected in the breeding field. The 94 F2 plants derived from a cross between LGL and Hanareum (a high-yielding tongil-type variety) were used for the quantitative trait loci (QTL) analysis of grain length (GL), grain width (GW), and grain thickness (GT). A linkage map of the F2 population, covering 1312 cM for all 12 chromosomes, was constructed using 123 Fluidigm SNP markers. A total of nine QTLs for the three traits were detected on chromosomes two, three, four, six, and seven. Two QTLs for GL on chromosomes two and six explained 17.3% and 16.2% of the phenotypic variation, respectively. Two QTLs were identified for GW on chromosomes two and three, and explained 24.3% and 23.5% of the phenotypic variation, respectively. The five QTLs for GT detected on chromosomes two, three, five, six and seven, explained 13.2%, 14.5%, 16.6%, 10.9%, and 10.2% of the phenotypic variation, respectively. A novel QTL for GT, qGT2, was validated on the same region of chromosome two in the selected F3 population. The QTLs identified in this study, and LGL, could be applied to the development of large-grain rice varieties.
Highlights
Published: 20 June 2021Rice is one of the most important grain crops in the world and is the main source of calories for half of the world’s population
grain width (GW), We focused on the grain size of large grain line (LGL) and evaluated three grain traits: and
The quantitative trait loci (QTL) for grain thickness (GT) in the F population was detected on the marker interval identical to Large grain size directly3 affects grain yield and quality, and is often considered a qGT2 and explained 10.52% of the phenotypic variance
Summary
Rice is one of the most important grain crops in the world and is the main source of calories for half of the world’s population. The grain yield of rice should be increased by 70–100%, relative to the current levels, to feed the increasing global population [1,2]. The grain yield of rice is mainly affected by three components: the number of grains per panicle, the number of panicles per plant, and grain weight. Grain weight is positively associated with grain size. Grain size is an important agricultural trait to improve the yield of rice. Grain size affects yield and quality [3]. Long and slender grains tend to be transparent and of edible quality, and highly prized in most rice-consuming regions globally. Large grains show a relatively high ratio of chalky grains such as white belly or white core
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