Maeno Koutaro, Tanaka Seiji
Locust Research Laboratory, National Institute of Agrobiological Sciences at Ohwashi (NIASO), Tsukuba, Ibaraki, Japan.
J Insect Physiol. 2009 Nov;55(11):1021-8. doi: 10.1016/j.jinsphys.2009.08.014. Epub 2009 Aug 31.
The role of juvenile hormone (JH) in the maternal regulation of progeny characteristics was examined in the desert locust, Schistocerca gregaria. Female adults of this species are known to produce smaller but more eggs when reared in isolation than do those reared in a group. Eggs laid by isolated females develop green hatchlings typical of solitarious forms, whereas those laid by the latter produce black hatchlings typical of gregarious forms. Topical application of a juvenile hormone analog (JHA), fenoxycarb, or implantation of corpora allata (CA) taken from the migratory locust, Locusta migratoria, caused crowded S. gregaria females to deposit smaller eggs, but did not have a significant effect on the number of eggs per egg pod except at high doses of JHA. The production of smaller eggs by treated and untreated crowded females was closely associated with earlier deposition of the egg pods and shorter oviposition intervals. However, neither JHA application nor CA implantation influenced the progeny characteristics in actively reproducing aged females under crowded conditions, while untreated control females started producing smaller and more eggs upon transfer to isolated conditions. These results may suggest that JH is not directly involved in the maternal regulation of phase-dependent progeny characteristics.
在沙漠蝗（Schistocerca gregaria）中研究了保幼激素（JH）在母体对后代特征调控中的作用。已知该物种的成年雌性若单独饲养，所产的卵数量较少但更多，而群居饲养的成年雌性所产卵的数量则不同。单独饲养的雌性所产的卵孵化出的是典型独居型的绿色幼虫，而群居饲养的雌性所产的卵孵化出的是典型群居型的黑色幼虫。局部施用保幼激素类似物（JHA）苯氧威，或植入从飞蝗（Locusta migratoria）获取的咽侧体（CA），会使群居的沙漠蝗雌性产下较小的卵，但除高剂量JHA外，对每个卵荚中的卵数没有显著影响。经处理和未经处理的群居雌性产下较小的卵，这与卵荚更早产出和产卵间隔更短密切相关。然而，在拥挤条件下，施用JHA或植入CA均未影响处于活跃繁殖期的老龄雌性的后代特征，而未经处理的对照雌性在转移到单独饲养条件后开始产下更小且更多的卵。这些结果可能表明，保幼激素并不直接参与母体对依赖虫态的后代特征的调控。
