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Identification of QTLs Underlying Folate Content in Milled Rice

Journal of Integrative Agriculture 2014年第9期13卷 1827-1834页

作者： DONG Wei CHENG Zhi-jun XU Jian-long ZHENG Tian-qing WANG Xiao-le ZHANG Hong-zheng WANG Jie WAN Jian-min National Key Facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Chinese Academy of Agricultural Sciences

Understanding the genetic mechanism underlying folate biosynthesis and accumulation in rice would be beneficial for breeding high folate content varieties as a cost-effective approach to addressing widespread folate deficiency in developing countries. In this study, the inheritance of rice grain folate content was investigated in the Lemont/Teqing recombinant inbred lines and the Koshihikari/Kasalath//Koshihikari backcross inbred lines. 264 F12 recombinant inbred lines（RILs） and 182 BC1F10 backcross inbred lines（BILs） with their parents planted in randomized complete blocks with two replicates in 2010, and RILs harvested in 2008 were used for QTL detection using inclusive composite interval mapping（ICIM） method. In the RIL population, two QTLs, denoted by qQTF-3-1 and qQTF-3-2（QTF, quantitative total folate）, explaining 7.8% and 11.1-15.8% of the folate content variation were detected in one or two years, respectively. In the BIL population, a QTL, denoted by qQTF-3-3, was detected, explaining 25.3% of the variation in folate content. All the positive alleles for higher folate content were from the high-folate parents, i.e., Teqing and Kasalath. The known putative folate biosynthesis genes do not underlie the QTLs detected in this study and therefore may be novel loci affecting folate content in milled rice. QTLs identified in this study have potential value for marker assisted breeding for high-folate rice variety.

关键词： rice recombinant inbred lines backcross inbred lines quantitative trait locus folate content

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Mapping Quantitative Trait Loci for Palatability of Milled Rice

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Rice science 2005年第1期12卷 19-24页

作者： TANGShao-qing HuPei-song JIAOGui-ai ZHAIHu-qu WANJian-min StateKeyLaboratoryofRiceBiology ChinaNationalRiceResearchInstituteHangzhou310006China ChineseAcademyofAgriculturalSciences Beijing100081China ChineseAcademyofAgriculturalSciences Beijing100081China／／StateKeyLaboratoryofCropGeneticsandGermplasmEnhancementNanjingAgriculturalUniversityNanjing210015China

Quantitative trait loci (QTLs) controlling palatability in rice were identified using a set of 98 backcross inbred lines (BILs) population derived from a cross between a japonica variety Nipponbare and an indica variety Kasalath. The palatability scores of the population measured by RQ1/Plus Rice Analyzer, showed a continuous and transgressive segregative distribution with a range from 66 to 92. Four putative QTLs for palatability, qPAL-5, qPAL-7, qPAL-8a and qPAL-8b, were detected on chromosome 5, 7 and 8, and they accounted 7.83, 7.03, 11.58 and 7.19% of the total phenotypic variation, respectively. Three alleles qPAL-5, qPAL-7 and qPAL-8b from Kasalath increased the palatability score, whereas only one Nipponbare allele qPAL-8a increased the score . Eight transgressive lines in palatability were selected to make a comparison between phenotypic and genotypic classes. The result explained the possibility of positive QTLs pyramiding through marker-assisted selection of highly palatable rice.

关键词： rice (Oryza sativa) palatability quantitative trait loci backcross inbred lines

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