| Title: | "Olfactory Receptor Neurons for Plant Volatiles and Pheromone Compounds in the Lucerne Weevil, Sitona discoideus" |
| Author(s): | Park KC; McNeill MR; Suckling DM; Unelius CR; |
| Address: | "The New Zealand Institute for Plant and Food Research Limited, Christchurch, 8140, New Zealand. AgResearch Limited, Private Bag 4749, Christchurch, 8140, New Zealand. School of Biological Sciences, University of Auckland, Auckland, 1142, New Zealand. The New Zealand Institute for Plant and Food Research Limited, Christchurch, 8140, New Zealand. rikard.unelius@lnu.se. Faculty of Health and Life Sciences, Linnaeus University, 391 82, Kalmar, Sweden. rikard.unelius@lnu.se" |
| DOI: | 10.1007/s10886-020-01160-y |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Print) 0098-0331 (Linking) |
| Abstract: | "Antennal olfactory receptor neurons (ORNs) for pheromone-related and plant volatile compounds were identified and characterized in the lucerne weevil, Sitona discoideus (Gyllenhal), using the single sensillum recording technique. Our study using five pheromone-related compounds and 42 plant volatile compounds indicates that S. discoideus have highly specialized ORNs for pheromone and plant volatile compounds. Different groups of ORNs present in both males and females of S. discoideus were highly sensitive to 4-methylheptane-3,5-dione (diketone) and four isomers (RR, RS, SR and SS) of 5-hydroxy-4-methylheptan-3-one, respectively. Our results also indicate that male S. discoideus, using the sensory input from antennal ORNs, can distinguish both diketone and the RR-isomer from others, and RS- and SS-isomers from others, although it was unclear if they can distinguish between RS-isomer and SS-isomer, or between diketone and the SR-isomer. It also appeared that female S. discoideus could distinguish between RS-isomer and SS-isomers. The antennae of S. discoideus thus contain sex-specific sets of ORNs for host- and non-host plant volatile compounds. Both sexes of S. discoideus have highly sensitive and selective ORNs for some green-leaf volatiles, such as (Z)-3-hexenol and (E)-2-hexenal. In contrast, male antennae of S. discoideus house three distinct groups of ORNs specialized for myrcene and (E)-beta-ocimene, 2-phenylethanol, and phenylacetaldehyde, respectively, whereas female antennae contain three groups of ORNs specialized for (+/-)-linalool and (+/-)-alpha-terpineol, myrcene and (E)-beta-ocimene, (+/-)-1-octen-3-ol, and 3-octanone. Our results suggest that S. discoideus use a multi-component pheromone communication system, and a sex-specific set of ORNs with a narrow range of response spectra for host-plant location" |
| Keywords: | "Animals Female Male Medicago sativa/*chemistry Olfactory Receptor Neurons/*physiology Pheromones/*metabolism Random Allocation Sensilla/physiology Volatile Organic Compounds/*metabolism Weevils/*physiology 4-methyl-3, 5- heptanedione 5-hydroxy-4-methyl-3-h;" |
| Notes: | "MedlinePark, Kye Chung McNeill, Mark R Suckling, David M Unelius, C Rikard eng ./Linneuniversitetet/ LINX0807/Bio-Protection Research Centre/ 2020/02/13 J Chem Ecol. 2020 Mar; 46(3):250-263. doi: 10.1007/s10886-020-01160-y. Epub 2020 Feb 12" |
