Abstract:
:In a Japanese population of Locusta migratoria, adult females become reproductively inactive under crowding and long days (LD) and reproductively active under crowding and short days (SD). The identity and titre of ecdysteroids in the haemolymph and ovaries from adult females reared under SD and LD were investigated by RIA/HPLC. The effects of exogenous juvenile hormone (JH) III treatments on the termination of such reproductive arrest and ecdysteroid contents in LD females were also examined. In general, ecdysteroid titres in both haemolymph and ovaries were significantly higher in reproductively active SD females than in reproductively inactive LD females. A clear difference was also observed in oocyte growth between SD and LD individuals. JH III applications (three consecutive topical applications, 150 &mgr;g per insect per day from day 3) stimulated ovarian development in LD females and significantly increased the haemolymph and ovarian ecdysteroids to a level comparable to that of reproductively active SD adult females.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Tawfik AI,Tanaka Y,Tanaka Sdoi
10.1016/s0022-1910(02)00058-6keywords:
subject
Has Abstractpub_date
2002-04-01 00:00:00pages
411-418issue
4eissn
0022-1910issn
1879-1611pii
S0022191002000586journal_volume
48pub_type
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