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<p>Oat (<i>Avena sativa</i> L.) has been strategically employed in crop rotation systems to reduce populations of southern root-knot nematode (RKN), <i>Meloidogyne incognita</i>, a major threat to agricultural regions worldwide. However, genomic regions associated with RKN resistance have not yet been identified in oats. The objective of this study was to identify genomic regions controlling resistance to RKN in oats. An elite oat panel of 378 genotypes was screened for RKN resistance under controlled environmental conditions. Genome-wide association analyses, accounting for population structure and relatedness, were performed using nematode reproduction factor. Phenotypic inputs included raw data and different resistance classifications with two and five categories. A genomic region associated with RKN resistance was identified on oat consensus groups Mrg20 and Mrg21, corresponding to chromosome 4&#xa0;A, regardless of the phenotypic data input. An analysis of candidate genes closely associated with six highly significant markers revealed the presence of immune receptors and putative disease resistance proteins, reinforcing the association between phenotype and genotype. This genomic region on chromosome 4&#xa0;A has also been associated with crown rust resistance in oats, suggesting that RKN resistance may be indirectly selected by oat breeders. Once validated under field conditions, it may serve as a foundation for marker-assisted selection of RKN resistance in oats, enabling the selection of resistant genotypes in early breeding generations.</p>

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Association Mapping Reveals a Genomic Region Associated with Oat Resistance to the Southern Root-Knot Nematode Meloidogyne incognita

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Guilherme Oliveira,
  • Cristiano M. Zimmer,
  • Andressa C. Zamboni,
  • Santino A. Da Silva,
  • Klever A. Arruda,
  • Marcelo T. Pacheco,
  • Luiz C. Federizzi

摘要

Oat (Avena sativa L.) has been strategically employed in crop rotation systems to reduce populations of southern root-knot nematode (RKN), Meloidogyne incognita, a major threat to agricultural regions worldwide. However, genomic regions associated with RKN resistance have not yet been identified in oats. The objective of this study was to identify genomic regions controlling resistance to RKN in oats. An elite oat panel of 378 genotypes was screened for RKN resistance under controlled environmental conditions. Genome-wide association analyses, accounting for population structure and relatedness, were performed using nematode reproduction factor. Phenotypic inputs included raw data and different resistance classifications with two and five categories. A genomic region associated with RKN resistance was identified on oat consensus groups Mrg20 and Mrg21, corresponding to chromosome 4 A, regardless of the phenotypic data input. An analysis of candidate genes closely associated with six highly significant markers revealed the presence of immune receptors and putative disease resistance proteins, reinforcing the association between phenotype and genotype. This genomic region on chromosome 4 A has also been associated with crown rust resistance in oats, suggesting that RKN resistance may be indirectly selected by oat breeders. Once validated under field conditions, it may serve as a foundation for marker-assisted selection of RKN resistance in oats, enabling the selection of resistant genotypes in early breeding generations.