Role of juvenile hormone and allatotropin on nutrient allocation, ovarian development and survivorship in mosquitoes
Role of juvenile hormone and allatotropin on nutrient allocation, ovarian development and survivorship in mosquitoes
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DOI：
10.1016/j.jinsphys.2006.08.009
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发表时间：
2007-03-01
影响因子：
2.2
通讯作者：
Noriega, Fernando G.
中科院分区：
文献类型：
--
作者：
Hernandez-Martinez, Salvador;Mayoral, Jaime G.;Noriega, Fernando G.
Tencral 储备用于启动蚊子卵黄生殖前卵巢发育。性能力储备低的雌性会减少保幼激素（JH）的合成和卵黄生殖发育前的发育。我们研究了 JH、促尿素 (AT) 和其他头部因子在卵黄发生前卵巢发育和成年存活率的调节中发挥的作用。来自头部的因素对于阿拉塔 (CA) 激活和生殖成熟至关重要。我们已经证明，在成虫蜕皮后 9-12 小时内斩首雌性会阻止卵黄发生前卵泡的正常发育；然而，通过局部应用 JH 类似物，可以在断头雌性中诱导最大程度的卵黄发生前卵巢发育。当雌性在羽化后 12 小时或更长时间被斩首时，营养资源已用于卵巢发育，存活率显着降低。为了研究 Allatotropin 水平是否与幼体储备相关，我们测量了在不同营养饮食下饲养幼虫所产生的两种成虫表型（大型和小型雌性）头部的 AT 滴度。在大型蚊子中，AT 水平在第 4 天增加到最高 45 fmol；相比之下，在评估的 7 天内，小蚊子头部的尿素水平保持在 9 fmol 以下。这些结果表明，只有当营养充足时，大脑释放的因子才会诱导CA合成足够的JH来激活生殖成熟。 (c) 2006 年，爱思唯尔有限公司出版。
Tencral reserves are utilized to initiate previtellogervic ovarian development in mosquitoes. Females having emerged with low teneral reserves have reduced juvenile hormone (JH) synthesis and previtellogervic development. We investigated what role JH, allatotropin (AT) and other head-factors play in the regulation of previtellogenic ovarian development and adult survivorship. Factors from the head are essential for corpora allata (CA) activation and reproductive maturation. We have shown that decapitation of females within 9-12 h after adult ecdysis prevented normal development of the previtellogenic follicles; however maximum previtellogenic ovarian development could be induced in decapitated females by topically applying a JH analog. When females were decapitated 12 or more hours after emergence nutritional resources had been committed to ovarian development and survivorship was significantly reduced. To study if allatotropin levels correlated with teneral reserves, we measured AT titers in the heads of two adult phenotypes (large and small females) generated by raising larvae under different nutritional diets. In large mosquitoes AT levels increased to a maximum of 45 fmol in day 4; in contrast, the levels of allatotropin in the heads of small mosquitoes remained below 9 fmol during the 7 days evaluated. These results suggest that only when nutrients are appropriate, factors released from the brain induce the CA to synthesize enough JH to activate reproductive maturation. (c) 2006 Published by Elsevier Ltd.