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Mo, Young-Jun,Jeung, Ji-Ung,Shin, Woon-Chul,Kim, Ki-Young,Ye, Changrong,Redoñ,a, Edilberto D.,Kim, Bo-Kyeong Japanese Society of Breeding 2014 Breeding science Vol.64 No.2
<P>Influences of allelic variations in starch synthesis-related genes (SSRGs) on rice grain quality were examined. A total of 187 nonglutinous Korean rice varieties, consisting of 170 <I>Japonica</I> and 17 Tongil-type varieties, were grown in the field and in two greenhouse conditions. The percentages of head rice and chalky grains, amylose content, alkali digestion value, and rapid visco-analysis characteristics were evaluated in the three different environments. Among the 10 previously reported SSRG markers used in this study, seven were polymorphic, and four of those showed subspecies-specific allele distributions. Six out of the seven polymorphic SSRG markers were significantly associated with at least one grain quality trait (<I>R</I><SUP>2</SUP> > 0.1) across the three different environments. However, the association level and significance were markedly lower when the analysis was repeated using only the 170 <I>Japonica</I> varieties. Similarly, the significant associations between SSRG allelic variations and changes in grain quality traits under increased temperature were largely attributable to the biased allele frequency between the two subpopulations. Our results suggest that within Korean <I>Japonica</I> varieties, these 10 major SSRG loci have been highly fixed during breeding history and variations in grain quality traits might be influenced by other genetic factors.</P>
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