Abstract:
:Tetranychus urticae (Acari: Tetranychidae) possesses a sac-like ovary with characteristic oocytes that protrude from the ovarian surface. In nondiapause females, transparent oocytes became opaque with yolk deposition between days 0 and 1 in the adult stage at 20 degrees C. In diapause females, however, ovarian development ceased at a stage having transparent oocytes without yolk deposition; this stage corresponded to the day-0 stage of the nondiapause females. Four partial fragments of the vitellogenin (Vg) genes of T. urticae were isolated. This is the first report on the Vg genes of mites. The deduced amino acid sequences of these four Vg gene fragments contained the von Willebrand factor D domain and the GLCG motif, which were reported to be the common features of Vg sequences in insects and ticks. Northern blot analysis did not detect Vg mRNA in the diapause adult females of T. urticae. It is, therefore, suggested that diapause mites do not synthesize Vg mRNA and that vitellogenesis is regulated at the transcriptional level in diapause.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Kawakami Y,Goto SG,Ito K,Numata Hdoi
10.1016/j.jinsphys.2008.10.007subject
Has Abstractpub_date
2009-01-01 00:00:00pages
70-7issue
1eissn
0022-1910issn
1879-1611pii
S0022-1910(08)00220-5journal_volume
55pub_type
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