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<p><i>Liriomyza trifolii</i> infestation represents a&#xa0;major biotic constraint associated with substantial alterations in photosynthetic performance and physiological status in <i>Solanum lycopersicum. </i>Chlorophyll&#xa0;<i>a</i>&#xa0;fluorescence analysis revealed progressive disruptions in primary photochemistry (ΦPo = Fv/Fm), electron transport efficiency (Ψ₀), active reaction-centre density (RC/CSm), absorption flux per cross-section (ABS/CSm), and overall photosynthetic performance (PIabs and PIcsm) with increasing infestation severity. Notably, measurable fluorescence responses were observed not only in symptomatic plants (S<sub>1</sub>–S<sub>3</sub>) but also in apparently healthy plants sampled from the infested population (S<sub>o</sub>), suggesting the sensitivity of chlorophyll&#xa0;<i>a</i>&#xa0;fluorescence to infestation-associated physiological changes. These photochemical responses were accompanied by changes in chlorophyll status and antioxidant activity, suggesting the onset of physiological stress prior to the development of extensive visible damage. Recovery assessments showed that post-treatment recovery frequencies decreased with increasing infestation severity. Following insecticide treatment, plant survival decreased progressively with increasing <i>L.&#xa0;trifolii</i> infestation severity, from 30/30 (100.0%, 95% CI: 88.6–100.0%) in the S₀ to 22/30 (73.3%, 95% CI: 55.6–85.8%) in S<sub>1</sub>, 8/30 (26.7%, 95% CI: 14.2–44.4%) in S<sub>2</sub>, and 1/30 (3.3%, 95% CI: 0.6–16.7%) in S<sub>3</sub>. Collectively, the findings highlight the potential utility of ΦPo (Fv/Fm), Ψ₀, RC/CSm, ABS/CSm, PIabs, and PIcsm as sensitive fluorescence-derived indicators of infestation-associated changes in photosynthetic function and recovery dynamics in tomato plants. Further validation using direct measures of pest presence and additional field-based studies is required to establish their broader applicability.</p>

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Chlorophyll a Fluorescence Based Physiological Screening of Stress Responses and Recovery Under Liriomyza trifolii Infestation in Solanum lycopersicum

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Komal Sharma,
  • Dipti Agarwal,
  • Upma Bhatt,
  • Vineet Soni

摘要

Liriomyza trifolii infestation represents a major biotic constraint associated with substantial alterations in photosynthetic performance and physiological status in Solanum lycopersicum. Chlorophyll a fluorescence analysis revealed progressive disruptions in primary photochemistry (ΦPo = Fv/Fm), electron transport efficiency (Ψ₀), active reaction-centre density (RC/CSm), absorption flux per cross-section (ABS/CSm), and overall photosynthetic performance (PIabs and PIcsm) with increasing infestation severity. Notably, measurable fluorescence responses were observed not only in symptomatic plants (S1–S3) but also in apparently healthy plants sampled from the infested population (So), suggesting the sensitivity of chlorophyll a fluorescence to infestation-associated physiological changes. These photochemical responses were accompanied by changes in chlorophyll status and antioxidant activity, suggesting the onset of physiological stress prior to the development of extensive visible damage. Recovery assessments showed that post-treatment recovery frequencies decreased with increasing infestation severity. Following insecticide treatment, plant survival decreased progressively with increasing L. trifolii infestation severity, from 30/30 (100.0%, 95% CI: 88.6–100.0%) in the S₀ to 22/30 (73.3%, 95% CI: 55.6–85.8%) in S1, 8/30 (26.7%, 95% CI: 14.2–44.4%) in S2, and 1/30 (3.3%, 95% CI: 0.6–16.7%) in S3. Collectively, the findings highlight the potential utility of ΦPo (Fv/Fm), Ψ₀, RC/CSm, ABS/CSm, PIabs, and PIcsm as sensitive fluorescence-derived indicators of infestation-associated changes in photosynthetic function and recovery dynamics in tomato plants. Further validation using direct measures of pest presence and additional field-based studies is required to establish their broader applicability.