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Abstract
Late Leaf Spot (LLS) disease caused by Nothopassalora personata (Berk. & M.A. Curtis) U. Braun, C. Nakash, Videira & Crous affects peanut (Arachis hypogaea L.) all around the world. IAC 322 is a breeding line with alien introgressions from A. cardenasii Krapov. & W.C. Gregory, a wild diploid relative of peanut, on chromosomes A02 and A03. Progenies from TifNV-High O/L x IAC 322 were genotyped and selected based on the introgressed segments they retained and phenotyped for LLS resistance under both in vitro and field conditions. IAC 322-derived progenies were found to have varied levels of LLS resistance. The introgressed segments on the top part of A02 and bottom part of A03 chromosomes accounted for the majority of LLS resistance. Moreover, high correlations between in vitro and field experiments, and between late stages of LLS severity and entire LLS infection progression under both field and in vitro experiments, were observed.