02481naa a2200289 a 450000100080000000500110000800800410001902200140006002400390007410000280011324500930014126000090023450003700024352012750061365300250188865300150191365300200192865300240194865300380197265300080201065300080201870000160202670000200204270000150206270000160207777300980209310650262024-12-27       2024    bl uuuu     u00u1 u    #d  a0967-08747 a10.1080/09670874.2024.23881572DOI1 aRODRÍGUEZ-DECUADRO, S.  aHaplotype diversity at nine spot blotch resistance QTL in barley.h[electronic resource]  c2024  aArticle history: Received 2 May 2024, Accepted 30 July 2024, Published online 6 December 2024. -- Corresponding: Pritsch, C.; Departamento de Biología Vegetal, Facultad de Agronomía, Universidad de la República, Garzón 809, Montevideo, Uruguay; email:clara@fagro.edu.uy -- Funding: This work was supported by INIA-FPTA 227. -- Publisher: Taylor and Francis Ltd.  aABSTRACT.- Spot blotch (SB), caused by Bipolaris sorokiniana is becoming an important barley disease in humid, temperate growing regions, including Uruguay. The narrow genetic base of current donors of resistance and recent changes in pathogen virulence have driven the search for novel sources of resistance. In this study, a diverse collection of 39 barley genotypes was evaluated for SB resistance, and genetic relationships, population structure, and haplotype diversity were investigated using 27 simple sequence repeats (SSRs) and eight sequence-tagged sites (STS) markers linked to nine QTL for SB resistance located on chromosomes 1H, 2H, 3H, 4H, and 7H. Fourteen barley genotypes expressed high and moderate SB resistance at seedling and adult plant stages. Distance and model-based cluster analyses revealed that the 14 selected lines clustered in four groups consistent with geographical origin and pedigree relatedness. Reference SB resistant haplotypes were poorly represented. Based on these results, we suggest that these 14 lines are likely candidates to carry novel genes or alleles for SB resistance. Further research may expand the understanding of the genetic architecture of this trait. © 2024 Informa UK Limited, trading as Taylor & Francis Group.  aCochliobolus sativus  aHaplotypes  aHordeum vulgare  aPolaris sorokiniana  aSISTEMA AGRÍCOLA-GANADERO - INIA  aSSR  aSTS1 aPEREYRA, S.1 aTORRES-PUYO, C.1 aCASTRO, A.1 aPRITSCH, C.  tInternational Journal of Pest Management, 2024. https://doi.org/10.1080/09670874.2024.2388157