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<p>The serpentine leaf miner [<i>Liriomyza trifolii</i> (Burgess)] has become a major pest of tomato (<i>Solanum lycopersicum</i> L.) in India. Physiological responses of flowering <i>S. lycopersicum</i> plants to three degrees of <i>L. trifolii</i> infestation (low, moderate, severe) were explored in this study. Compared to non-infested (control) plants, foliar volatiles appeared to be more enriched in sesquiterpenes (mainly β-caryophyllene) at the expense of monoterpenes (mainly β-phellandrene) with more severe infestation. Molecular docking (in&#xa0;silico) indicated strong binding affinities of β-caryophyllene with chitin synthase, acetylcholinesterase and α-amylase in leaf miners, suggesting interfering roles of sesquiterpenes in feeding activity, nerve impulse propagation and development in these herbivores. Foliar chlorophyll contents, photosynthetic efficiency, polyunsaturated fatty acids (particularly membrane glycolipids) and soluble sugar levels were found to decline with higher degrees of infestation. Loss of leaf tissue by herbivory was characterized by rapidly rising antioxidant enzyme activities, by these parameters steadied or declined under the maximal observed damage conditions. Endogenous increments in antioxidant enzymes and total phenolics, including tannins (a specialized class of phenolics), were the main defense response under low or moderate degrees of herbivory, but more carbon-expensive flavonoids and terpenoids were up-regulated under higher degrees of leaf tissue damage. These patterns indicated diversion of metabolic pathways toward optimized phytochemical defense under resource limitation brought about by severe degrees of herbivory. Extensive leaf tissue damage also affected the biochemical profiles of flowers (such as sugar depletion and less diverse volatilome) – potentially causing loss of reproductive success. These observations are expected to contribute to in situ pest management via semiochemical-based approaches and timely mitigation of stress brought about by <i>L. trifolii</i> infestations in standing tomato crop.</p>

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Volatile-mediated defense and metabolic responses in flowering tomato plants (Solanum lycopersicum) under serpentine leaf miner (Liriomyza trifolii) infestation

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Sourav Manna,
  • Ishita Paul,
  • Subhadeep Das,
  • Riya Saha,
  • Oishika Chatterjee,
  • Mousumi Poddar Sarkar

摘要

The serpentine leaf miner [Liriomyza trifolii (Burgess)] has become a major pest of tomato (Solanum lycopersicum L.) in India. Physiological responses of flowering S. lycopersicum plants to three degrees of L. trifolii infestation (low, moderate, severe) were explored in this study. Compared to non-infested (control) plants, foliar volatiles appeared to be more enriched in sesquiterpenes (mainly β-caryophyllene) at the expense of monoterpenes (mainly β-phellandrene) with more severe infestation. Molecular docking (in silico) indicated strong binding affinities of β-caryophyllene with chitin synthase, acetylcholinesterase and α-amylase in leaf miners, suggesting interfering roles of sesquiterpenes in feeding activity, nerve impulse propagation and development in these herbivores. Foliar chlorophyll contents, photosynthetic efficiency, polyunsaturated fatty acids (particularly membrane glycolipids) and soluble sugar levels were found to decline with higher degrees of infestation. Loss of leaf tissue by herbivory was characterized by rapidly rising antioxidant enzyme activities, by these parameters steadied or declined under the maximal observed damage conditions. Endogenous increments in antioxidant enzymes and total phenolics, including tannins (a specialized class of phenolics), were the main defense response under low or moderate degrees of herbivory, but more carbon-expensive flavonoids and terpenoids were up-regulated under higher degrees of leaf tissue damage. These patterns indicated diversion of metabolic pathways toward optimized phytochemical defense under resource limitation brought about by severe degrees of herbivory. Extensive leaf tissue damage also affected the biochemical profiles of flowers (such as sugar depletion and less diverse volatilome) – potentially causing loss of reproductive success. These observations are expected to contribute to in situ pest management via semiochemical-based approaches and timely mitigation of stress brought about by L. trifolii infestations in standing tomato crop.