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Mi-hee Song,Ji-min Oh,Susan R. McCouch,Sang-Nag Ahn 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Awn, one of the domestication-related traits in rice might play an important role in seed dispersal. In a previous study, one major QTL, awn8 was detected on chromosome 8 using 120 RILs and 62 ILs derived from a cross between Hwayeongbyeo and O. rufipogon Griff. (Acc. W1944). We developed 140 BC1F3, 341 BC1F4 and 1533 BC1F5 plants from selfing of one plant selected from former generation. Each of selected plant was Hwayeongbeyo/W1944 heterozygous in the target region of chromosome 8. The Target marker(RM256) significantly linked to awn8 explained 60.3% of the total phenotypic variance in BC1F4 generations and the W1944 allele increased awn length. Using several substitution mapping, The awn8 QTL could be narrow down to the interval between RM23338-RM5485, with a distance of about 85.29kb. Total of ten genes were predicted in this region. At the same time, 34 BC3F5 lines were developed as the diverse NILs on chromosme 8. Using these NILs, One QTL for primary branch was detected in the target region and W1944 allele increased branch number. Characterization of the awn8 QTL would contribute the understanding of rice domestication and evolution and additional experiment would be need to be clarified whether awn8 and pb8 was due to linkage drag of independent genes or pleiotropic effect of the same gene.
Kim, HyunJung,Jeong, Eung Gi,Ahn, Sang-Nag,Doyle, Jeffrey,Singh, Namrata,Greenberg, Anthony J,Won, Yong Jae,McCouch, Susan R Springer 2014 Rice Vol.7 No.-
<P><B>Background</B></P><P>Rice accounts for 43% of staple food production in the Democratic People’s Republic of Korea (DPRK). The most widely planted rice varieties were developed from a limited number of ancestral lines that were repeatedly used as parents in breeding programs. However, detailed pedigrees are not publicly available and little is known about the genetic, phenotypic, and geographical variation of DPRK varieties.</P><P><B>Results</B></P><P>We evaluated 80 <I>O. sativa</I> accessions from the DPRK, consisting of 67 improved varieties and 13 landraces. Based on nuclear SSR analysis, we divide the varieties into two genetic groups: <I>Group 1</I> corresponds to the <I>temperate japonica</I> subpopulation and represents 78.75% of the accessions, while <I>Group 2</I> shares recent ancestry with <I>indica</I> varieties. Interestingly, members of <I>Group 1</I> are less diverse than <I>Group 2</I> at the nuclear level, but are more diverse at the chloroplast level. All <I>Group 2</I> varieties share a single <I>Japonica</I> maternal-haplotype, while <I>Group 1</I> varieties trace maternal ancestry to both <I>Japonica</I> and <I>Indica</I>. Phenotypically, members of <I>Group 1</I> have shorter grains than <I>Group 2,</I> and varieties from breeding programs have thicker and wider grains than landraces. Improved varieties in <I>Group</I> 1 also show similar and/or better levels of cold tolerance for most traits, except for <I>spikelet number per panicle</I>. Finally, geographic analysis demonstrates that the majority of genetic variation is located within regions that have the most intensive rice cultivation, including the Western territories near the capital city Pyungyang. This is consistent with the conscious and highly centralized role of human selection in determining local dispersion patterns of rice in the DPRK.</P><P><B>Conclusions</B></P><P>Diversity studies of DPRK rice germplasm revealed two genetic groups. The most widely planted group has a narrow genetic base and would benefit from the introduction of new genetic variation from cold tolerant landraces, wild accessions, and/or cultivated gene pools to enhance yield potential and performance.</P>
Identification of quantitative trait loci for physical and chemical properties of rice grain
Cho, Yong-Gu,Kang, Hyeon-Jung,Lee, Young-Tae,Jong, Seung-Keun,Eun, Moo-Young,McCouch, Susan R. The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.1
Quantitative trait loci (QTL) associated with six physical traits of cooked rice and seven chemical properties of rice grain were identified using a recombinant inbred (RI) population of rice evaluated over 3 years at the National Honam Agricultural Research Institute in Korea. The RI population consisted of 164 lines derived from a cross between Milyang23 and Gihobyeo, and the genetic map consisted of 414 molecular markers. A total of 49 QTL were identified for the 13 physico-chemical properties using composite interval mapping. Of these, 13 QTL were identified for 2 or more years, while 36 were detected in only 1 year. Five QTL were identified over all 3 years and will be useful for marker-assisted improvement of rice grain quality in Korea. The two QTL with the highest LOD scores, adhesiveness1.2 and potassium content7.1, provide a valuable starting point for positional cloning of genes underlying these QTL.