한아름2호 × 운광 재조합 집단을 이용한 수량 관련 형질 QTLs 분석
QTL Analysis of Yield Traits Using Hanareum2/Unkwang Recombinant Inbred Lines
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초록
The rice recombinant inbred lines derived from Hanareum2 and Unkwang (HURILs) cross were used in genetic mapping and QTL analysis studies using the inclusive composite interval mapping (ICIM) method. In this study, we constructed the genetic map using 241 SNP markers based on the SNPs in the whole genome region between these varieties. As a result, the total genetic distance and average distances were 1,142 cM and 4.7 cM, respectively. Both heading date and plant height are important traits related to grain yield in rice. Twelve heading date QTLs were detected under natural condition in Korea. A major QTL qDTH3-2 for heading date and qCL1-2 for plant height explained 25.8~27.4% and 30.8~56.9% of the phenotypic variations in the HURIL populations. Four panicle traits, grain number (GN), panicle length (PL), number of panicle per plant (NPP), grain filling ratio (GFR) were evaluated for QTL effects in HURILs population during two years. Results showed that a total of twelve QTLs for GN, PL, NPP, and GFR were detected on chromosome 2, 3, 4, 6, 7, 8. A major QTL qGNP4 for GN was detected in HURIL populations with LOD score 7.7-19.3 and explained 6.7-17.69% of phenotypic variations. Twenty-five QTLs for the four traits TGW, GL, GW, and GT were identified in the HURIL populations for two years (2014~2015). The three QTLs, qTGW8, qGL8-2, and qGW8-2, shared the same interval between id8007093 and id8007764 on chromosome 8 with explained 4.8-4.1%, 4.2-6.8%, and 5.3-10.5% of phenotypic variations, respectively. Furthermore, two QTLs, qTGW3-2 and qGL3-2, were detected in the same chromosomal interval at the same position. These findings will benefit breeding design for development of high yielding variety in rice.
Abstract
The rice recombinant inbred lines derived from Hanareum2 and Unkwang (HURILs) cross were used in genetic mapping and QTL analysis studies using the inclusive composite interval mapping (ICIM) method. In this study, we constructed the genetic map using 241 SNP markers based on the SNPs in the whole genome region between these varieties. As a result, the total genetic distance and average distances were 1,142 cM and 4.7 cM, respectively. Both heading date and plant height are important traits related to grain yield in rice. Twelve heading date QTLs were detected under natural condition in Korea. A major QTL qDTH3-2 for heading date and qCL1-2 for plant height explained 25.8~27.4% and 30.8~56.9% of the phenotypic variations in the HURIL populations. Four panicle traits, grain number (GN), panicle length (PL), number of panicle per plant (NPP), grain filling ratio (GFR) were evaluated for QTL effects in HURILs population during two years. Results showed that a total of twelve QTLs for GN, PL, NPP, and GFR were detected on chromosome 2, 3, 4, 6, 7, 8. A major QTL qGNP4 for GN was detected in HURIL populations with LOD score 7.7-19.3 and explained 6.7-17.69% of phenotypic variations. Twenty-five QTLs for the four traits TGW, GL, GW, and GT were identified in the HURIL populations for two years (2014~2015). The three QTLs, qTGW8, qGL8-2, and qGW8-2, shared the same interval between id8007093 and id8007764 on chromosome 8 with explained 4.8-4.1%, 4.2-6.8%, and 5.3-10.5% of phenotypic variations, respectively. Furthermore, two QTLs, qTGW3-2 and qGL3-2, were detected in the same chromosomal interval at the same position. These findings will benefit breeding design for development of high yielding variety in rice.
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