Chemical ecology of Himalayan eggplant variety's antixenosis identification of geraniol as an oviposition deterrent against the eggplant shoot and fruit borer

Chemical ecology of Himalayan eggplant variety's antixenosis : identification of geraniol as an oviposition deterrent against the eggplant shoot and fruit borer

© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 240(2023), 3 vom: 14. Nov., Seite 1259-1274
1. Verfasser: Ghosh, Rituparna (VerfasserIn)
Weitere Verfasser: Metze, Dennis, Sant, Surhud, Shaikh, Maroof, Deshpande, Ashish, Firake, Dnyaneshwar M, Pandit, Sagar
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Leucinodes orbonalis Solanum melongena antixenosis chemical ecology host selection oviposition deterrence pest management volatile organic compounds (VOCs) mehr... geraniol L837108USY
Beschreibung
Zusammenfassung:© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.
Eggplant (Solanum melongena) suffers severe losses due to a multi-insecticide-resistant lepidopteran pest, shoot and fruit borer (SFB, Leucinodes orbonalis). Heavy and combinatorial application of pesticides for SFB control renders eggplant risky for human consumption. We observed that gravid SFB females do not oviposit on Himalayan eggplant variety RC-RL-22 (RL22). We hypothesized that RL22 contained an antixenosis factor. Females' behavior indicated that the RL22 cue they perceived was olfactory. To identify it, leaf volatile blends of seven eggplant varieties were profiled using solid phase microextraction and gas chromatography mass spectrometry. Seven RL22-specific compounds were detected in the plant headspace. In choice assays, oviposition deterrence efficacies of these candidate compounds were independently tested by their foliar application on SFB-susceptible varieties. Complementation of geraniol, which was exclusively found in RL22, reduced oviposition (> 90%). To validate geraniol's role in RL22's SFB-deterrence, we characterized RL22's geraniol synthase and silenced its gene in planta, using virus-induced gene silencing. Geraniol biosynthesis suppression rendered RL22 SFB-susceptible; foliar geraniol application on the geraniol synthase-silenced plants restored oviposition deterrence. We infer that geraniol is RL22's SFB oviposition deterrent. The use of natural compounds like geraniol, which influence the chemical ecology of oviposition, can reduce the load of hazardous synthetic larvicides
Beschreibung:Date Completed 23.10.2023
Date Revised 26.10.2023
published: Print-Electronic
CommentIn: New Phytol. 2023 Nov;240(3):915-917. doi: 10.1111/nph.19172. - PMID 37551037
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.18877