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<p>Guava (<i>Psidium guajava</i> L.) is a tree crop that produces robust fruit, typically originating in the American tropics. It belongs to the family Myrtaceae and is currently distributed across tropical and subtropical regions worldwide. Among various biotic stress factors, root-knot nematodes (RKN) <i>Meloidogyne enterolobii</i> and <i>M. incognita</i> play a crucial role in the destruction of guava plants through parasitism. A simulation study was conducted to document the metabolic changes in guava plants infected with <i>M. enterolobii</i> and <i>M. incognita</i>. Considering plant growth and nematode incidence, <i>M. enterolobii</i> was found to be more aggressive in guava compared to <i>M. incognita</i>. It was concluded that <i>M. enterolobii</i> caused high susceptibility, while <i>M. incognita</i> was more tolerant. The vital metabolites responsible for successful parasitism were identified using Gas Chromatography − Mass Spectrometry (GC–MS) analysis. Pathway and enrichment analyses determined the pathogenic variations, metabolic pathways responsible for parasitism and their expression levels in the infested plants for these two species. The GC–MS analysis revealed that butanoate metabolism was triggered by <i>M. enterolobii</i> through (S)-3-hydroxy-3-methylglutaryl-CoA, leading to the production of Acetyl CoA and the compounds L-glutamate and succinate. In contrast, linoleic acid metabolism was upregulated and initiated by phosphatidylcholine, resulting in the formation of 13-hydroperoxyoctadeca-9,11-dienoic acid in plants infected with <i>M. incognita</i>. Activities of saturated and unsaturated fatty acid biosynthesis were significantly enriched in nematode-infected plants compared to healthy ones.</p>

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Unraveling the pathogenic variations and untargeted metabolomic profiling of root knot nematode,Meloidogyne enterolobii and Meloidogyne incognita infected guava plants

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Dharani Selvam,
  • Devrajan Kandasamy,
  • Swarnakumari Narayanan,
  • K. Angappan,
  • Subburamu Karthikeyan,
  • N. Ashokkumar

摘要

Guava (Psidium guajava L.) is a tree crop that produces robust fruit, typically originating in the American tropics. It belongs to the family Myrtaceae and is currently distributed across tropical and subtropical regions worldwide. Among various biotic stress factors, root-knot nematodes (RKN) Meloidogyne enterolobii and M. incognita play a crucial role in the destruction of guava plants through parasitism. A simulation study was conducted to document the metabolic changes in guava plants infected with M. enterolobii and M. incognita. Considering plant growth and nematode incidence, M. enterolobii was found to be more aggressive in guava compared to M. incognita. It was concluded that M. enterolobii caused high susceptibility, while M. incognita was more tolerant. The vital metabolites responsible for successful parasitism were identified using Gas Chromatography − Mass Spectrometry (GC–MS) analysis. Pathway and enrichment analyses determined the pathogenic variations, metabolic pathways responsible for parasitism and their expression levels in the infested plants for these two species. The GC–MS analysis revealed that butanoate metabolism was triggered by M. enterolobii through (S)-3-hydroxy-3-methylglutaryl-CoA, leading to the production of Acetyl CoA and the compounds L-glutamate and succinate. In contrast, linoleic acid metabolism was upregulated and initiated by phosphatidylcholine, resulting in the formation of 13-hydroperoxyoctadeca-9,11-dienoic acid in plants infected with M. incognita. Activities of saturated and unsaturated fatty acid biosynthesis were significantly enriched in nematode-infected plants compared to healthy ones.