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<p><i>Meloidogyne incognita</i> is one of the most important root-knot nematode species, causing significant yield losses in hot and sweet peppers (<i>Capsicum</i> spp.) worldwide. The employment of resistant cultivars is one of the most efficient and sustainable management strategies for this pathogen. However, there is a limited amount of data available on sources of resistance to <i>M. incognita</i> in <i>Capsicum chinense</i> germplasm. Herein, we evaluated the reaction to <i>M. incognita</i> of a genetically diverse <i>C. chinense</i> germplasm (collected in the Brazilian Amazon Basin), searching for useful sources of genetic resistance. Forty <i>C. chinense</i> accessions and two tomato controls were evaluated in two experiments conducted under greenhouse conditions. Individual plants were inoculated with a suspension containing 5000 eggs + second-stage juveniles (J2). Evaluations were carried out 60&#xa0;days after inoculation according to the following criteria: egg mass index (EMI), gall index (GI), number of eggs and J2 per gram of roots (NR), the reproduction factor (RF), and the reproduction index (RI). Accessions exhibited varying types of reactions to <i>M. incognita</i>. New sources of resistance to <i>M. incognita</i> were identified in the accessions ‘CNPH 15348’, ‘CNPH 60087’, ‘CNPH 55001’, ‘CNPH 60090’, ‘CNPH 15749’, and the Brazilian cultivar ‘BRS Nandaia’. Thus far, sources of genetic resistance to <i>Meloidogyne</i> species in <i>Capsicum</i> species were identified mainly in <i>C. annuum</i> accessions. Hence, this subgroup of <i>C. chinense</i> accessions might represent potential sources of novel resistance genes/alleles, expanding the genetic basis of this relevant breeding trait.</p>

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Sources of resistance to Meloidogyne incognita in a diverse Capsicum chinense germplasm collection from the Amazon region

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Thavio Júnior Barbosa Pinto,
  • Dwillian Firmiano Cunha,
  • Giovani Olegário da Silva,
  • Leonardo Silva Boiteux,
  • Carlos Francisco Ragassi,
  • Valdir Ribeiro Correia,
  • Felipe Santos Rafael,
  • Cláudia Silva da Costa Ribeiro,
  • Sabrina Isabel Costa de Carvalho,
  • Jadir Borges Pinheiro,
  • Juvenil Enrique Cares

摘要

Meloidogyne incognita is one of the most important root-knot nematode species, causing significant yield losses in hot and sweet peppers (Capsicum spp.) worldwide. The employment of resistant cultivars is one of the most efficient and sustainable management strategies for this pathogen. However, there is a limited amount of data available on sources of resistance to M. incognita in Capsicum chinense germplasm. Herein, we evaluated the reaction to M. incognita of a genetically diverse C. chinense germplasm (collected in the Brazilian Amazon Basin), searching for useful sources of genetic resistance. Forty C. chinense accessions and two tomato controls were evaluated in two experiments conducted under greenhouse conditions. Individual plants were inoculated with a suspension containing 5000 eggs + second-stage juveniles (J2). Evaluations were carried out 60 days after inoculation according to the following criteria: egg mass index (EMI), gall index (GI), number of eggs and J2 per gram of roots (NR), the reproduction factor (RF), and the reproduction index (RI). Accessions exhibited varying types of reactions to M. incognita. New sources of resistance to M. incognita were identified in the accessions ‘CNPH 15348’, ‘CNPH 60087’, ‘CNPH 55001’, ‘CNPH 60090’, ‘CNPH 15749’, and the Brazilian cultivar ‘BRS Nandaia’. Thus far, sources of genetic resistance to Meloidogyne species in Capsicum species were identified mainly in C. annuum accessions. Hence, this subgroup of C. chinense accessions might represent potential sources of novel resistance genes/alleles, expanding the genetic basis of this relevant breeding trait.