| Title: | Pheromone gland development and monoterpenoid synthesis specific to oviparous females in the pea aphid |
| Author(s): | Murano K; Ogawa K; Kaji T; Miura T; |
| Address: | "1Laboratory of Ecological Genetics, Graduate School of Environmental Science, Hokkaido University, Sapporo, Hokkaido 060-0810 Japan. ISNI: 0000 0001 2173 7691. GRID: grid.39158.36 2Laboratory of Functional Genomics, National Institute for Basic Biology, Okazaki, Aichi 444-8585 Japan. ISNI: 0000 0004 0618 8593. GRID: grid.419396.0 3Bamfield Marine Science Centre, 100 Pachena Rd, Bamfield, British Columbia V0R 1B0 Canada. ISNI: 0000 0004 0373 8836. GRID: grid.423167.5 4Misaki Marine Biological Station, School of Science, The University of Tokyo, 1024 Koajiro, Misaki, Miura, Kanagawa 238-0225 Japan. ISNI: 0000 0001 2151 536X. GRID: grid.26999.3d" |
| DOI: | 10.1186/s40851-018-0092-0 |
| ISSN/ISBN: | 2056-306X (Print) 2056-306X (Electronic) 2056-306X (Linking) |
| Abstract: | "BACKGROUND: Aphids display 'cyclic parthenogenesis,' in which parthenogenetically and sexually reproducing morphs seasonally alternate in the aphid annual life cycles. There are various characteristics that differ between asexual viviparous and sexual oviparous females. In oviparous females, swollen cuticular structures (~ 10 mum in diameter), called 'scent plaques,' are scattered on the surface of hind tibias, and secrete monoterpenoid sex pheromones. However, the developmental processes of the pheromone glands and the biosynthetic pathways of monoterpenoid pheromones have yet to be elucidated. RESULTS: Comparisons of the developmental processes that form hind tibias between sexual and parthenogenetic females revealed that, in sexual females, the epithelial tissues in proximal parts of hind tibias become columnar in fourth instar nymphs, and circular pheromone glands with Class 1 gland cells appear in adults, although they do not appear in parthenogenetic females. Furthermore, by comparing the expression levels of genes involved in the mevalonate pathway, which is required for monoterpenoid synthesis, we show that genes that encode the downstream enzymes in the pathway are highly expressed in hind tibias of sexual females. CONCLUSION: Glandular tissues of scent plaque are differentiated from the fourth instar in sexual females, while parthenogenetic females lack the glandular cells. Only the downstream steps of the mevalonate pathway appear to occur in scent plaques on hind tibias of sexual females, although the upstream steps may occur somewhere in other body parts" |
| Keywords: | Epidermal gland Hind tibia Mevalonate pathway Oviparous female Parthenogenesis Pea aphid Reproductive polyphenism Scent plaque Sex pheromone; |
| Notes: | "PubMed-not-MEDLINEMurano, Koki Ogawa, Kota Kaji, Tomonari Miura, Toru eng England 2018/05/22 Zoological Lett. 2018 May 11; 4:9. doi: 10.1186/s40851-018-0092-0. eCollection 2018" |
