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http://dx.doi.org/10.5352/JLS.2015.25.8.925

Genetic Mapping of QTLs that Control Grain Characteristics in Rice (Oryza sativa L.)  

Wacera, Home Regina (Department of Food Security and Agricultural Development, College of Agriculture & Life Science, Kyungpook National University)
Safitri, Fika Ayu (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture & Life Science, Kyungpook National University)
Lee, Hyun-Suk (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture & Life Science, Kyungpook National University)
Yun, Byung-Wook (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture & Life Science, Kyungpook National University)
Kim, Kyung-Min (Division of Plant Biosciences, School of Applied Biosciences, College of Agriculture & Life Science, Kyungpook National University)
Publication Information
Journal of Life Science / v.25, no.8, 2015 , pp. 925-931 More about this Journal
Abstract
We performed a molecular marker-based analysis of quantitative trait loci (QTLs) for traits that determine the quality of the appearance of grains, using 120 doubled-haploid (DH) lines developed by another culture from the F1 cross between ‘Cheongcheong’ (Oryza sativa L. ssp. Indica) and ‘Nagdong’ (Oryza sativa L. ssp. Japonica). The traits studied included length, width, and thickness of the grains, as well as length-to-width ratio and 1,000-grain weight. The objective of this study was to determine the genetic control of these traits in order to formulate a strategy for improving the appearance of this hybrid. Within the DH population, five traits exhibited wide variation, with mean values occurring within the range of the two parents. Three QTLs were identified for grain length on chromosomes 2, 5, and 7. Three QTLs were mapped for grain width on chromosome 2: qGW2-1, qGW2-2, and qGW2-3. Six chromosomes were identified for the grain length-to-width ratio; four of these were on chromosome 2, whereas the other two were on chromosomes 7 and 12. One QTL influencing 1,000-grain weight was identified and located on chromosome 8. The results presented in the present study should facilitate rice-breeding, especially for improved hybrid-rice quality.
Keywords
Doubled haploid; grain quality; QTL; rice;
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