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<p>Herbivore-induced plant volatiles (HIPVs) are crucial chemical cues guiding insect herbivores and their natural enemies to the potential hosts. However, the effects and underlying mechanisms of HIPVs on insect development and reproduction remain underexplored. This study investigated the cotton bollworm <i>Helicoverpa armigera</i>-induced cotton volatiles as well as their impacts on larval performance, adult fecundity and transcriptome of <i>H. armigera</i>. Upon cotton bollworm feeding, the volatile compositions of cotton leaves, calyxes, and bolls were altered, with (<i>Z</i>)-3-hexenyl acetate (HAC) being the most significantly induced volatile. HAC exposure had negative effects on <i>H. armigera</i>, including reduced food intake, slower larval growth, prolonged larval lifespan, and a significant decrease in adult fecundity. RNA-Seq and qRT-PCR analysis revealed that HAC exposure altered the expression of genes related to cuticles, muscles, and juvenile hormone metabolism in larvae. In adults, the transcriptome changes were less pronounced and mainly associated with carbohydrate metabolism. Our results suggest that cotton bollworm feeding induces HAC production, which negatively impacts bollworm development and reproduction by modulating gene expression. These findings provide new insights into the role of HIPVs in insect herbivore physiology and their potential for biological control.</p>

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Herbivore-induced plant volatile (Z)-3-hexenyl acetate impairs larval performance and adult fecundity of cotton bollworm

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Baojuan Zeng,
  • Mina Jiang,
  • Shan He,
  • Jiong Liu,
  • Yongkang Huang,
  • Lu Li,
  • Guanqing Zhai,
  • Xi Zhang,
  • Shutang Zhou

摘要

Herbivore-induced plant volatiles (HIPVs) are crucial chemical cues guiding insect herbivores and their natural enemies to the potential hosts. However, the effects and underlying mechanisms of HIPVs on insect development and reproduction remain underexplored. This study investigated the cotton bollworm Helicoverpa armigera-induced cotton volatiles as well as their impacts on larval performance, adult fecundity and transcriptome of H. armigera. Upon cotton bollworm feeding, the volatile compositions of cotton leaves, calyxes, and bolls were altered, with (Z)-3-hexenyl acetate (HAC) being the most significantly induced volatile. HAC exposure had negative effects on H. armigera, including reduced food intake, slower larval growth, prolonged larval lifespan, and a significant decrease in adult fecundity. RNA-Seq and qRT-PCR analysis revealed that HAC exposure altered the expression of genes related to cuticles, muscles, and juvenile hormone metabolism in larvae. In adults, the transcriptome changes were less pronounced and mainly associated with carbohydrate metabolism. Our results suggest that cotton bollworm feeding induces HAC production, which negatively impacts bollworm development and reproduction by modulating gene expression. These findings provide new insights into the role of HIPVs in insect herbivore physiology and their potential for biological control.