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

Authors: ROSSO, MELINA - Criadero El Carmen, Arg; DE BLAS, FRANCISCO - Universidad Nacional De Cordoba; Massa, Alicia; ODDINO, CLAUDIO - National University Of Rio Cuarto; GIORDANO, DAMIAN - National University Of Rio Cuarto; JOSE, SEIJO - Universidad Nacional De Cordoba; Arias De Ares, Renee; SOAVE, JUAN - Criadero El Carmen, Arg; SOAVE, SARA - Criadero El Carmen, Arg; BUTTELER, MARIO - Criadero El Carmen, Arg; BRESSANO, MARINA - Universidad Nacional De Cordoba

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 10/25/2022
Publication Date: 11/23/2022
Citation: Rosso, M.H., De Blas, F.J., Massa, A.N., Oddino, C., Giordano, D.F., Arias De Ares, R.S., Soave, J.H., Soave, S.J., Butteler, M.I., Bressano, M. 2023. Two QTLs govern the resistance to Sclerotinia minor in an interspecific peanut RIL population. Crop Science. 63:613-621. https://doi.org/10.1002/csc2.20875.
DOI: https://doi.org/10.1002/csc2.20875

Interpretive Summary: Sclerotinia blight is a soil borne disease of peanut caused by the fungus Sclerotinia minor, causes severe decrease of yield. Cultural management strategies and chemical treatment have not been effective. Therefore, the development of resistant varieties is the most effective control method for the disease. To identify regions of the peanut genome conferring resistance to peanut blight, this study evaluated a population of recombinant inbred lines carrying genes from three wild peanut species. Two regions of the genome were identified on chromosomes A04 and B04. The detection of genome regions conferring resistance to this disease, along with their associated molecular markers, will have immediate application in the development of resistant peanut cultivars.

Technical Abstract: Sclerotinia blight is a soilborne disease caused by Sclerotinia minor Jagger and can produce severe decrease in yield. Cultural management strategies and chemical treatment are not completely effective; therefore, growing peanut-resistant varieties is likely to be the most effective control method for this disease. Sclerotinia blight resistance has been identified in wild Arachis species and further transferred to peanut elite cultivars. To identify the genome regions conferring Sclerotinia blight resistance within a tetraploid genetic background, this study evaluated a population of recombinant inbred lines (RIL) with introgressed genes from three wild diploid species: A. cardenasii, A. correntina, and A. batizocoi. Two consistent quantitative trait loci (QTLs), qSbIA04 and qSbIB04 located on chromosomes A04 and B04, respectively, were identified. The QTL qSbIA04 was mapped at 56.39 cM explaining 29% of the phenotypic variance and qSbIB04 was mapped at 13.38 cM explaining 22% of the overall phenotypic variance.