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<p>Root-knot nematode (<i>Meloidogyne incognita</i>) are amongst the most economically significant plant-parasitic nematodes, causing substantial yield and quality losses across a wide range of crops. Due to the withdrawal of several synthetic nematicides and the limitations of existing control strategies, there is a growing need for sustainable alternatives. In this study, 99 genotypes of <i>Brassica</i> spp. were evaluated artificially under controlled conditions to assess their resistance to <i>M. incognita</i>. Phenotypic screening based on root galling index (RGI), soil nematode population, and reproduction factor (Rf) revealed significant variation among genotypes. Thirty-nine genotypes were categorized as immune (RGI = 0, Rf &lt; 1), showing complete suppression of nematode reproduction and gall formation. An additional 24 genotypes demonstrated resistant responses with minimal galling (RGI 0.1-1). Circular hierarchical cluster analysis grouped genotypes into four distinct clusters based on nematode response traits. The strong resistance exhibited by several <i>Brassica</i> lines is attributed to the glucosinolate-myrosinase system, which releases isothiocyanates-bioactive compounds with known nematicidal activity. These results provide a basis for integrating resistant <i>Brassica</i> genotypes into biofumigation and green manuring systems, offering an ecologically sound strategy for root-knot nematode management.</p>

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Phenotypic characterization of Brassica genotypes for resistance to root knot nematode, Meloidogyne incognita

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Harkanwal Pal Singh,
  • Narpinderjeet Kaur Dhillon,
  • Sukhjeet Kaur,
  • Anupam Sekhon

摘要

Root-knot nematode (Meloidogyne incognita) are amongst the most economically significant plant-parasitic nematodes, causing substantial yield and quality losses across a wide range of crops. Due to the withdrawal of several synthetic nematicides and the limitations of existing control strategies, there is a growing need for sustainable alternatives. In this study, 99 genotypes of Brassica spp. were evaluated artificially under controlled conditions to assess their resistance to M. incognita. Phenotypic screening based on root galling index (RGI), soil nematode population, and reproduction factor (Rf) revealed significant variation among genotypes. Thirty-nine genotypes were categorized as immune (RGI = 0, Rf < 1), showing complete suppression of nematode reproduction and gall formation. An additional 24 genotypes demonstrated resistant responses with minimal galling (RGI 0.1-1). Circular hierarchical cluster analysis grouped genotypes into four distinct clusters based on nematode response traits. The strong resistance exhibited by several Brassica lines is attributed to the glucosinolate-myrosinase system, which releases isothiocyanates-bioactive compounds with known nematicidal activity. These results provide a basis for integrating resistant Brassica genotypes into biofumigation and green manuring systems, offering an ecologically sound strategy for root-knot nematode management.