INSECTA

PLANTAS HUESPEDES

METABOLOMICA

COMPUESTOS ORGANICOS VOLATILES

BIBLIOGRAFIA NACIONAL QUIMICA

2023

Herbivorous insects assess and choose their potential host plants based on traits that may correlate with host suitability or quality. These traits may operate as cues for better resources, noxious chemicals, or fewer competitors and enemies. Interac tions between insects and their host plants may also be modulated by the nutritional value of the plant, by plant chemical stimuli, or by physical traits such as trichomes. Diferences in chemical or physical cues among plants may convey informa tion about diet suitability. Several studies have addressed the topic of diferences in plant traits between host and non-host plants; fewer have addressed these diferences among potential host plants. We have studied the efect of chemical and physi cal plant traits on the feeding and oviposition preferences of the oligophagous herbivore Epilachna paenulata (Coleoptera: Coccinellidae) and two of its host plants, Cucurbita maxima and Cucurbita moschata (Cucurbitaceae). We frst typifed the volatile and non-volatile chemical profles and the trichome distribution of the plants. Then, using behavioral assays, we evaluated feeding and oviposition preferences of E. paenulata. Further, to assess a correlation between oviposition prefer ences and ofspring survival, we measured larval performance as indicated by survival, mass, and time to complete each instar. Female longevity in both Cucurbita host plants was also evaluated. Our results show that the congeneric plants bear diferences in their chemical profles, including volatile organic compounds, leaf waxes, and leaf parenchyma metabolites. Trichome abundance was also diferent, with C. maxima presenting fewer hairs. Epilachna paenulata females laid signif cantly more eggs in C. maxima, regardless of the plant they were raised as larvae. Female longevity on C. maxima was higher, but larval performance showed no diference between both plants.The proximate causes mediating female oviposition preferences may then involve trichome abundance, oviposition deterrents, toxic substances, or a combination of these factors.

Arthropod-Plant Interactions, 2023

Springer

2023

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20 p.

Inglés

Artículo

10.1007/s11829-023-10004-x

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