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이동령,장홍지아,Yuting Zeng,김백기,권순욱 한국육종학회 2023 Plant Breeding and Biotechnology Vol.11 No.4
Rice domestication has led to cultivated rice with no or short awns. Discovery of novel genes associated to awn lengthis of paramount importance for understanding the molecular mechanisms for the transformation of wild rice long awns to awnlesscultivated rice. In this study, we employed Next-Generation Sequencing based QTL-seq approach to identify genomic regionsassociated with awn length using mapping population derived from a cross between awnless Tun Sart and awned Sobaekmangsudo. QTL-seq analysis identified two awn length QTLs viz. qAwn-4 (12.8-20.3 Mb) and qAwn-8 (22.3-27.2 Mb) on chromosome 4 and 8,respectively. Based on the sequence comparison between the two parents, Os04g0350700 (bHLH transcription factor) was postulatedto be the candidate of Awn-4 gene. Further discovery of the novel genes in qAwn-8 interval will provide insights into the geneticarchitecture of awn length.
Genome-Wide Association Study of Blast Resistant in Korean Rice (Oryza sativa L.) Breed Lines
함태호,이자홍,장성규,김무현,장홍지아,김나은,권순욱,이주현 한국육종학회 2022 Plant Breeding and Biotechnology Vol.10 No.2
A total of 857 rice breed lines were used to evaluate rice blast resistance. Frequency of leaf spot index was skewed to theright of the 1-9 scale in bar plot, with a score of 7 showing the highest frequency. The average spot index score of 857 breed lines was5.33. Associations showing higher than the threshold of ‒log10(P) = 5.17 were detected as significant associations. Significantlyassociated single nucleotide polymorphism (SNP) markers located within ± 250 kb on the lead SNP position was designated to one QTLlocus of lead SNP markers. Five association loci were detected. Two associated QTLs detected on Chr. 4 were designated as qRB4.1and qRB422, explaining 17.8% and 14.3% of total phenotypic variations, respectively. Associated QTLs detected on Chr. 1, 11, and 12(one each) designated as qRB1, qRB11 and qRB12 explained 44.6%, 9.09%, and 13.7% of total phenotypic variations, respectively. Wecompared previously reported QTLs. The location of qRB4.2 was overlapped with the previously reported QTL for blast fieldresistance. The location of qRB12 was also overlapped with the field resistance leaf blast. The other one, qRB4.1, was overlapped withbacterial blight resistance.
서정환(Jeonghwan Seo),장홍지아(Hongjia Zhang),이아림(Ah-Rim Lee),이원도(Wondo Lee),조유현(Yoo-Hyun Cho),권순욱(Soon-Wook Kwon),이주현(Joohyun Lee) 한국육종학회 2021 한국육종학회지 Vol.53 No.4
Root development at the seedling stage is an important trait for the early growth of rice. In this study, the root length and weightof 211 Korean landrace rice at the seedling stage were evaluated, and the average root length and weight were 6.94 cm and 48.18 mg, respectively. Principal component analysis (PCA) of 211 accessions based on 70,849 SNPs presented three subgroups. Two quantitative trait loci (QTLs)associated with root length were detected on chromosomes 3 and 6 using genome-wide association study (GWAS). Four haplotypes wereidentified using associated SNPs for the two root length QTLs. The average root length of Hap2 and Hap 3 was 7.32 cm and 6.56 cm,respectively, and were significantly different. Gene expression analysis in the candidate regions of QTLs for root length at the seedling stageshowed that several genes were expressed in the root. QTLs associated with root length at the seedling stage identified in this study maybe applied to improve the root length trait and detect candidate genes.