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Herbivore\u2010induced plant volatiles (HIPVs) are key components of plant defense and can influence insect behavior and physiology. However, their molecular effects on insect reproduction remain poorly understood. This study aimed to investigate how the plant volatile (3E,7E)\u20104,8,12\u2010trimethyltrideca\u20101,3,7,11\u2010tetraene (TMTT) affects the reproduction of\n                      <jats:italic>N. lugens<\/jats:italic>\n                      and to elucidate the underlying molecular mechanisms.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>\n                      Exposure to TMTT significantly reduced oviposition under laboratory conditions and in semi\u2010field cages, and delayed ovarian development without affecting survival. Transcriptomic profiling showed that the neuropeptide receptor gene\n                      <jats:italic>CapaR<\/jats:italic>\n                      was the most strongly upregulated in the ovary (18.5\u2010fold at day 1; 10.8\u2010fold at day 5). Functional assays demonstrated that RNA interference\u2010mediated silencing of\n                      <jats:italic>CapaR<\/jats:italic>\n                      reversed TMTT's effects, leading to increased egg production, a shortened preoviposition period and accelerating ovarian maturation. These results indicate that\n                      <jats:italic>CapaR<\/jats:italic>\n                      is involved in the inhibitory effect of TMTT on reproduction.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSION<\/jats:title>\n                    <jats:p>\n                      This study identifies\n                      <jats:italic>CapaR<\/jats:italic>\n                      as a molecular link between plant volatile perception and insect reproductive regulation. The findings reveal a novel neuropeptide\u2010based mechanism by which HIPVs modulate insect fecundity and highlight the potential of environmentally friendly, fecundity\u2010targeted pest management strategies for rice pests. \u00a9 2026 Society of Chemical Industry.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/ps.70495","type":"journal-article","created":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T07:02:22Z","timestamp":1767769342000},"page":"3738-3747","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Plant volatile\n                    <scp>TMTT<\/scp>\n                    suppresses reproduction of the brown planthopper by affecting the neuropeptide receptor\n                    <scp>\n                      <i>CapaR<\/i>\n                    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