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Vitellogenesis and oocyte development in azadirachtin‐induced fifth‐instar overage nymphs of Locusta migratoria (L.)
Author(s) -
Shalom Uri,
Applebaum Shalom W.,
Pener M. Paul
Publication year - 1988
Publication title -
archives of insect biochemistry and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.576
H-Index - 66
eISSN - 1520-6327
pISSN - 0739-4462
DOI - 10.1002/arch.940090406
Subject(s) - vitellogenesis , vitellogenin , nymph , biology , hemolymph , acrididae , oocyte , instar , muda , moulting , endocrinology , medicine , azadirachtin , decapoda , andrology , orthoptera , crustacean , zoology , microbiology and biotechnology , ecology , biochemistry , pesticide , larva , embryo , gene
Injection of azadirachtin into females of Locusta migratoria at the beginning of the last nymphal instar prevented molting to the adult stage, and many of these locusts survived for long periods as overage fifth‐instar nymphs. Overage female nymphs synthesized vitellogenin; maximum vitellogenin content in their hemolymph was 6–7 times higher than that found in normal adult females. The overage female nymphs developed vitellogenic oocytes, but development was retarded to some extent: although vitellogenin did accumulate in the proximal oocytes, their maximum average length was only about 2.8 mm (compared to 6.2 mm in normal adult females) and extensive oocyte resorption was observed. Thus, attainment of adult competence of the organs and processes involved in female reproduction is independent to a considerable extent from the process of overt adult morphogenesis.