Two QTLs govern the resistance to <i>Sclerotinia minor</i> in an interspecific peanut RIL population

Rosso, Melina; Blas, Francisco J. de; Massa, Alicia N.; Oddino, Claudio; Giordano, Damián Francisco; Seijo, Guillermo; Arias, Renée S.; Soave, Juan H.; Soave, Sara J.; Buteler, Mario I.; Bressano, Marina

doi:10.1002/csc2.20875

Cited by 2 publications

References 56 publications

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Widening the Arachis hypogaea seed chemical composition: the case of a recombinant inbred lines introgressed with genes from three different wild species

de Blas,

Seijo,

Costero

et al. 2024

Plant Genet. Resour.

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Peanut (Arachis hypogaea L.) is an important row crop rich in oil, protein, vitamins and other micro-nutrients. The intensive selection of the cultigen, a cultivated plant deliberately altered by humans through cultivation, has resulted in favourable changes in yield and biochemical composition. Nevertheless, it has generated a narrow genetic basis that limits the development of new varieties with resistance to pests, diseases and environmental stresses. In this study, we address this limitation by characterizing the proximate and fatty acid composition of a multi-disease-resistant interspecific recombinant inbred line (RIL) population derived from three wild Arachis species and a cultivated elite peanut line that is being used to widen the genetic basis of the crop. The population was also genotyped with the Axiom Arachis 48K SNP array and used to detect quantitative trait loci (QTL) for oil, protein content and oleic and linoleic fatty acid percentages. A wide range of proximate composition was found in the RIL population. Eighteen and 11 individuals had high oil and protein content, respectively, and no undesirable traits related to oil quality had been introduced into the population from wild species. The fatty acid composition of oleic and linoleic acids was found to be regulated by two major QTL. The discovery of markers within the major effect QTL for the most significant chemical traits provides new opportunities for the creation of resistant and extremely nutrient-dense peanut cultivars.

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Widening the Arachis hypogaea seed chemical composition: the case of a recombinant inbred lines introgressed with genes from three different wild species

de Blas,

Seijo,

Costero

et al. 2024

Plant Genet. Resour.

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Molecular Markers for Assisted Selection in Sclerotinia Blight and Peanut Smut Resistance

Bressano,

Blas,

Rosso

et al. 2024

Preprint

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Argentina is a global leader in peanut production, exporting over 90% of its yield to nearly 100 countries. However, soilborne diseases, particularly Sclerotinia blight and peanut smut, critically impact the sustainability of peanut agriculture. Sclerotinia blight, caused by Sclerotinia minor and S. sclerotiorum, and peanut smut, caused by Thecaphora frezzii, have led to severe economic losses with incidence rates up to 50%. Despite efforts in cultural and chemical disease management, their effectiveness is limited. Consequently, the development of resistant cultivars offers a realistic and sustainable solution. This study focuses on developing and validating KASP markers for resistance against these diseases. By adapting a rapid and cost-effective DNA extraction method, the research facilitated the genotyping of 2,575 F2 plants derived from five crosses of promising parental lines. Three KASP markers for each disease were tested, with Scl1, Scl3, and S3 showing high predictive efficiency for Sclerotinia blight and peanut smut. The study identified 265 plants carrying resistance alleles which represents 10.3% of the total tested plants. These findings highlight the potential of molecular markers in breeding disease-resistant peanut varieties, ensuring sustainable production in Argentina.

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Two QTLs govern the resistance to Sclerotinia minor in an interspecific peanut RIL population

Cited by 2 publications

References 56 publications

Widening the Arachis hypogaea seed chemical composition: the case of a recombinant inbred lines introgressed with genes from three different wild species

Widening the Arachis hypogaea seed chemical composition: the case of a recombinant inbred lines introgressed with genes from three different wild species

Molecular Markers for Assisted Selection in Sclerotinia Blight and Peanut Smut Resistance

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