Fecha de publicación: -- Fuente: PubMed "rice" Physiol Plant. 2026 Sep-Oct;178(5):e71129. doi: 10.1111/ppl.71129.ABSTRACTPlants respond to insect herbivory by activating defence signalling pathways that regulate metabolism and volatile emissions. In rice, jasmonate signalling plays a central role in the production of herbivore-induced plant volatiles (HIPVs), yet the contribution of lipid-derived semi-volatile compounds to parasitoid-mediated tritrophic interactions remains poorly understood. Here, we studied the effects of rice leaffolder (Cnaphalocrocis medinalis) herbivory, exogenous jasmonic acid (JA) treatment and mechanical damage on volatile profiles in rice (Oryza sativa L.) and evaluated the behavioural responses of the egg parasitoid, Trichogramma chilonis. Volatile organic compounds were collected using a dynamic volatile trapping system and analysed by GC-MS. A total of 31 putatively identified compounds belonging to hydrocarbons, aldehydes, alcohols, esters and aromatic compounds were detected, with clear treatment-specific differences in composition and abundance. Herbivore infestation and JA treatment altered the relative abundance of several lipid-derived compounds, whereas the combined JA + herbivory treatment produced the most complex volatile blend, indicating interactive effects of hormonal signalling and herbivore-associated cues. Multivariate analyses further revealed distinct volatile signatures among treatments, demonstrating that herbivory, jasmonate signalling and mechanical damage differentially influence rice volatile composition. Behavioural bioassays showed that several lipid-derived compounds enhanced parasitisation by T. chilonis, with the long-chain aldehydes tetradecanal and hexadecanal eliciting particularly strong responses. Collectively, these findings suggest that jasmonate-associated changes in lipid-derived semi-volatile compounds may contribute to parasitoid recruitment and provide new insights into the potential role of medium- and long-chain lipid-derived volatiles in rice-mediated tritrophic interactions.PMID:42785731 | DOI:10.1111/ppl.71129