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<p>Invasive chilli thrips, <i>Thrips parvispinus</i> (Karny) coexists with <i>Thrips subnudula</i> (Karny) on chillies, <i>Capsicum annuum</i> L. causing damage to the flowers and leaves. Thrips rely on olfactory cues for host selection, mating and oviposition. Olfaction in thrips is mediated by a pair of antennae with sensilla distributed on its surface to perceive the olfactory stimuli. As both <i>T. parvispinus</i> and <i>T. subnudula</i> share chilli as their host, a comparative analysis was done between the two species to establish the morphology and distribution of antennal sensilla using scanning electron microscopy (SEM). In both the species, nine types of sensilla: Böhm bristles (BB), sensilla basiconica (SBI, SBII, SBIII), sensilla chaetica (SChI, SChII), sensilla coeloconica (SCo), sensilla trichoidea (ST), sensilla campaniformia (SCa), sensilla cavity (SCav), sensilla mammillary (SM) and micro trichia (MT) were identified. Although the sensilla arrangement was similar in both species, <i>T. parvispinus</i> had longer antennae and larger sensilla especially those linked to olfactory and thermo-hygrosensory functions indicating sensory adaptations for more complex host-seeking behavior. In contrast, <i>T. subnudula</i>, despite sharing common host (chilli), exhibited relatively smaller and less elaborated sensilla structures, reflecting its limited ecological niche. This study will add to the information on the morphological foundation of the antennae which could be used to elucidate the olfactory mechanisms in two species of thrips mentioned above.</p>

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Antennal sensilla architecture of Thrips parvispinus (Karny) and Thrips subnudula (Karny) infesting chillies, Capsicum annuum L.: insights from scanning electron microscopy

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Chandrasekaran Praveenkumar,
  • Saminathan Vangili Ramasamy,
  • Rachana Rajan Remani,
  • Kesavan Subaharan,
  • Preetha Gnanadhas,
  • Selvam Saravanan,
  • Subrata Goswami,
  • Amala Udayakumar,
  • Vellaikumar Sampathrajan,
  • Kavitha Chinnasamy,
  • S. N. Sushil

摘要

Invasive chilli thrips, Thrips parvispinus (Karny) coexists with Thrips subnudula (Karny) on chillies, Capsicum annuum L. causing damage to the flowers and leaves. Thrips rely on olfactory cues for host selection, mating and oviposition. Olfaction in thrips is mediated by a pair of antennae with sensilla distributed on its surface to perceive the olfactory stimuli. As both T. parvispinus and T. subnudula share chilli as their host, a comparative analysis was done between the two species to establish the morphology and distribution of antennal sensilla using scanning electron microscopy (SEM). In both the species, nine types of sensilla: Böhm bristles (BB), sensilla basiconica (SBI, SBII, SBIII), sensilla chaetica (SChI, SChII), sensilla coeloconica (SCo), sensilla trichoidea (ST), sensilla campaniformia (SCa), sensilla cavity (SCav), sensilla mammillary (SM) and micro trichia (MT) were identified. Although the sensilla arrangement was similar in both species, T. parvispinus had longer antennae and larger sensilla especially those linked to olfactory and thermo-hygrosensory functions indicating sensory adaptations for more complex host-seeking behavior. In contrast, T. subnudula, despite sharing common host (chilli), exhibited relatively smaller and less elaborated sensilla structures, reflecting its limited ecological niche. This study will add to the information on the morphological foundation of the antennae which could be used to elucidate the olfactory mechanisms in two species of thrips mentioned above.