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<p><i>Luffa</i> <i>cylindrica</i> (L.) Roem., or vegetable loofah, is a species of socioeconomic importance with potential for exploitation of its fruit in different segments, as well as for use as a rootstock for other cucurbits. However, owing to the variability presented by the species, it is necessary to select uniform genotypes for each type of farm. Thus, the objective of this study was to evaluate and select loofah accessions resistant to <i>Meloidogyne incognita</i> and <i>M. javanica</i>. Correlation analyses were performed between vegetative and resistance variables, and variance components were estimated. A total of 15 accessions from the Federal Rural University of the Semi-Arid Region were used. <i>Abelmoschus esculentus</i> cv. 'Santa Cruz 47' was the susceptibility standard and <i>Crotalaria spectabilis</i> the resistance standard. The experiments used a randomized block design with eight replications. Each accession was evaluated separately for <i>M. incognita</i> and <i>M. javanica</i>. Five thousand eggs and second-stage juveniles were inoculated per plant. The total number of eggs and juveniles (TNN) was estimated to calculate the reproduction factor (RF). Stem diameter, root fresh mass (FRM), shoot fresh and dry mass (DSM), number of fruits, and SPAD index were measured. Variance components were estimated via SELEGEN-REML/BLUP, and correlations were determined via Pearson’s correlation. RF ranged from 0.20 (B23) to 9.41 (B13) for <i>M. incognita</i> and from 0.17 (B19) to 8.33 (B24) for <i>M. javanica</i>. Accessions B15, B18, B19, B21, and B22 were resistant to both species. For <i>M. incognita</i>, heritability ranged from 1.9% to 36%, and for <i>M. javanica</i> from 0 to 25%. A significant correlation was identified between resistance variables (RF and TNN) and FRM and DSM. These materials, particularly the resistant accessions identified, exhibited low reproduction factors and favorable vegetative performance, highlighting their potential as rootstocks to enhance agronomic performance in nematode-infested areas.</p>

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Correlation between nematode resistance and vegetative development in Luffa cylindrica accessions: an approach with variance components

  • 期刊论文

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  • 发表日期：

    2026年7月7日

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  • Nynyve Thaynar Brito de Almeida,
  • Francismária Freitas de Lima,
  • Antonio Cesar de Araujo Filho,
  • Benedito Charlles Damasceno Neves,
  • Geovanna Alicia Dantas Gomes,
  • Alessandra Nunes da Silva,
  • Edicleide Macedo da Silva,
  • Glauber Henrique de Sousa Nunes,
  • João Everthon da Silva Ribeiro,
  • Rivanildo Júnior Ferreira,
  • Pedro Luiz Martins Soares,
  • Lindomar Maria da Silveira,
  • Aurélio Paes Barros Júnior

摘要

Luffa cylindrica (L.) Roem., or vegetable loofah, is a species of socioeconomic importance with potential for exploitation of its fruit in different segments, as well as for use as a rootstock for other cucurbits. However, owing to the variability presented by the species, it is necessary to select uniform genotypes for each type of farm. Thus, the objective of this study was to evaluate and select loofah accessions resistant to Meloidogyne incognita and M. javanica. Correlation analyses were performed between vegetative and resistance variables, and variance components were estimated. A total of 15 accessions from the Federal Rural University of the Semi-Arid Region were used. Abelmoschus esculentus cv. 'Santa Cruz 47' was the susceptibility standard and Crotalaria spectabilis the resistance standard. The experiments used a randomized block design with eight replications. Each accession was evaluated separately for M. incognita and M. javanica. Five thousand eggs and second-stage juveniles were inoculated per plant. The total number of eggs and juveniles (TNN) was estimated to calculate the reproduction factor (RF). Stem diameter, root fresh mass (FRM), shoot fresh and dry mass (DSM), number of fruits, and SPAD index were measured. Variance components were estimated via SELEGEN-REML/BLUP, and correlations were determined via Pearson’s correlation. RF ranged from 0.20 (B23) to 9.41 (B13) for M. incognita and from 0.17 (B19) to 8.33 (B24) for M. javanica. Accessions B15, B18, B19, B21, and B22 were resistant to both species. For M. incognita, heritability ranged from 1.9% to 36%, and for M. javanica from 0 to 25%. A significant correlation was identified between resistance variables (RF and TNN) and FRM and DSM. These materials, particularly the resistant accessions identified, exhibited low reproduction factors and favorable vegetative performance, highlighting their potential as rootstocks to enhance agronomic performance in nematode-infested areas.