Possible involvement of ecdysteroids in photoperiodically induced suppresion of ovarian development in a Japanese strain of the migratory locust, Locusta migratoria.

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 Physiol

authors

Tawfik AI,Tanaka Y,Tanaka S

doi

10.1016/s0022-1910(02)00058-6

keywords:

subject

Has Abstract

pub_date

2002-04-01 00:00:00

pages

411-418

issue

4

eissn

0022-1910

issn

1879-1611

pii

S0022191002000586

journal_volume

48

pub_type

杂志文章