花生网斑病抗性基因的遗传分析及QTL定位

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Abstract： Peanut web blotch，a fungal disease affecting the leaves of peanut plants，can substantially impact both yieldand quality.Genetic analysis and QTL mapping of resistance genesagainst this diseaseare crucial for identifying resistant germplasm resourcesand advancing peanut breeding.This study employeda recombinant inbred line（RIL）population consisting of 807 individuals derived from the cross between 'Huayu 44'and'DF12'to dissect the genetic basis through QTL mapping for resistance.The analysis showed that the resistance mechanism followed the MX1-A-AI inheritance model，characterized bya combination of one major additivegene and multiple minor-efect genesand epistatic interactions.The major gene exhibited substantial heritability across three environmental conditions（ 63.44% ， 60.70% and 74.64% ，respectively）.ThroughQTL mapping，we identified five QTLs，qDIA02.1，qDIA02.2，qDIB07，qDIB08，and qDIB09，distributed across four linkage groups，explaining 4.68%-15.91% of the phenotypic variation. Three QTLs，qDIA02.1，qDIB07， and qDIBo9，were repeatedly detected across three environments，explaining 5.15%-9.43% ， 7.62%-15.91% ， and 5.24%-6.16% of phenotypic variation，respectively.qDIB07 was identified as a potential major QTL， indicating that peanut web blotch resistance is predominantly regulated by major genes.These findings provide a basis for future precisely localizing resistance genes to peanut web blotchand developing disease-resistant peanut varieties.

Keywords：peanut;web blotch;RIL population;genetic analysis;QTL

栽培花生（ArachishypogaeaL.）是重要的油料作物和经济作物，起源于南美洲[1]。（剩余16309字）