Title: Juvenile Hormone titre and vitellogenin gene expression related to ovarian development in primary reproductives compared with nymphs and nymphoid reproductives of the termite<i>Reticulitermes speratus</i>
Abstract: Physiological EntomologyVolume 35, Issue 1 p. 52-58 Juvenile Hormone titre and vitellogenin gene expression related to ovarian development in primary reproductives compared with nymphs and nymphoid reproductives of the termite Reticulitermes speratus KIYOTO MAEKAWA, Corresponding Author KIYOTO MAEKAWA Graduate School of Science and Engineering, University of Toyama, Toyama, JapanKiyoto Maekawa, Graduate School of Science and Engineering, University of Toyama, Toyama, 930-8555 Japan. Tel.: +81 76 445 6629; fax: +81 76 445 6641; e-mail: [email protected]Search for more papers by this authorKYOKO ISHITANI, KYOKO ISHITANI Graduate School of Science and Engineering, University of Toyama, Toyama, JapanSearch for more papers by this authorHIROKI GOTOH, HIROKI GOTOH Graduate School of Environmental Science, Hokkaido University, Sapporo, JapanSearch for more papers by this authorRICHARD CORNETTE, RICHARD CORNETTE Division of Insect Sciences, National Institute of Agrobiological Sciences, Tsukuba, JapanSearch for more papers by this authorTORU MIURA, TORU MIURA Graduate School of Environmental Science, Hokkaido University, Sapporo, JapanSearch for more papers by this author KIYOTO MAEKAWA, Corresponding Author KIYOTO MAEKAWA Graduate School of Science and Engineering, University of Toyama, Toyama, JapanKiyoto Maekawa, Graduate School of Science and Engineering, University of Toyama, Toyama, 930-8555 Japan. Tel.: +81 76 445 6629; fax: +81 76 445 6641; e-mail: [email protected]Search for more papers by this authorKYOKO ISHITANI, KYOKO ISHITANI Graduate School of Science and Engineering, University of Toyama, Toyama, JapanSearch for more papers by this authorHIROKI GOTOH, HIROKI GOTOH Graduate School of Environmental Science, Hokkaido University, Sapporo, JapanSearch for more papers by this authorRICHARD CORNETTE, RICHARD CORNETTE Division of Insect Sciences, National Institute of Agrobiological Sciences, Tsukuba, JapanSearch for more papers by this authorTORU MIURA, TORU MIURA Graduate School of Environmental Science, Hokkaido University, Sapporo, JapanSearch for more papers by this author First published: 11 February 2010 https://doi.org/10.1111/j.1365-3032.2009.00711.xCitations: 52Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract To elucidate the reproductive cycle of termite queens, incipient colonies of Reticulitemes speratus (Isoptera: Rhinotermitidae) are established under laboratory conditions, and the transition of colony development is observed at 0.5, 1.5, 2.5, 3.5, and 7.5 months (stages I–V, respectively) after colony foundation. Ovarian development, vitellogenin gene expression and Juvenile Hormone (JH) titres are examined in the queens and in nonphysogastric nymphoids collected from natural colonies. A reproductive cycle in queens is observed, in which the oviposition rate is relatively higher during stages I and II, and then decreases during stages III and IV. Vitellogenic oocytes are not observed in the ovaries during stages III and IV, and the expression level of the vitellogenin gene is low, suggesting that egg production in queens is repressed during these stages. However, vitellogenin gene expression and egg deposition in queens resumes during stage V. Juvenile Hormone levels rise during the transition from nymphs to stage I queens, and elevated JH titres are observed also during stages III and IV. The decrease in JH titre in queens at stage II precedes the decline in vitellogenesis at stages III and IV. Thus, JH titre and vitellogenesis are correlated in an offset pattern. However, nonphysogastric nymphoid reproductives do not have vitellogenic oocytes in their ovaries, and their JH titre is two-fold higher than that of queens, suggesting that elevated JH titre precedes vitellogenesis, as in queens. References Borst, D.W., Eskew, M.R., Wagner, S.J. et al. (2000) Quantification of juvenile hormone III, vitellogenin, and vitellogenin-mRNA during the oviposition cycle of the lubber grasshopper. Insect Biochemistry and Molecular Biology, 30, 813–819. Brent, C.S., Schal, C. & Vargo, E.L. 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