The effects of environmental variation on a mechanism that controls insect body size
The effects of environmental variation on a mechanism that controls insect body size
复制标题
环境变化对控制昆虫体型大小机制的影响
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Nijhout
中科院分区：
文献类型：
--
作者：
G. Davidowitz;L. D'Amico;H. Nijhout
动物成年后的体型大小由生长期的持续时间和在此期间获得的体重决定。很少有体型调节模型能够区分这两个组成部分或明确解决控制生长期持续时间的机制。烟草天蛾 Manduca sexta 的体型大小受三个基本生理因素控制：生长速度；保幼激素衰退开始的时间（启动化蛹过程），以临界重量衡量；促胸腺激素（PTTH，刺激蜕皮类固醇分泌）和蜕皮类固醇分泌的时间，通过生长停止的时间间隔（ICG，达到临界体重和进入蛹前游荡阶段之间的时间间隔）来衡量。临界重量和 ICG 决定了生长期的持续时间，而生长速率则决定了该期间积累的质量量。我们研究了 M. sexta 的体型表型可塑性如何响应温度和饮食质量的变化，并受到这三个体型生理决定因素的表型可塑性的影响。我们表明，响应饮食质量的尺寸可塑性受生长速率和临界重量的变化调节，而响应温度的尺寸可塑性受生长速率和 ICG 的变化调节。这些结果证明了激素事件的时间安排在表型可塑性调节中的重要性。我们认为，调节体型的生理过程的不同敏感性可能使昆虫能够调整成年体型，以响应多种环境刺激的同时变化。
Adult body size in animals is determined by the duration of the growth period and the amount of mass gained during that period. Few models of body size regulation distinguish between these two components or explicitly address the mechanisms that control the duration of the growth period. Body size in the tobacco hornworm Manduca sexta is controlled by three underlying physiological factors: growth rate; timing of the onset of juvenile hormone decay (which initiates the processes leading to pupation), as measured by the critical weight; and the timing of prothoracicotropic hormone (PTTH, which stimulates ecdysteroid secretion) and ecdysteroid secretion, as measured by the interval to cessation of growth (ICG, the time interval between the attainment of the critical weight and entry into the pre-pupal wandering stage). The critical weight and the ICG determine the duration of the growth period, while growth rate determines how much mass accumulates during that period. We studied how phenotypic plasticity of body size in M. sexta, in response to variation in temperature and diet quality, is affected by phenotypic plasticity of these three physiological determinants of body size. We show that plasticity of size in response to diet quality is regulated by variation in growth rate and critical weight, while plasticity of size in response to temperature is regulated by variation in growth rate and the ICG. These results demonstrate the importance of the timing of hormonal events in the regulation of phenotypic plasticity. We suggest that the differential sensitivity of the physiological processes that regulate body size may enable insects to adjust adult body size in response to simultaneous variation in multiple types of environmental stimuli.
烟草天蛾（Manduca sexta）促促胸腺激素的释放本质上是由保幼激素控制的。
DOI：
10.1242/jeb.120.1.41
发表时间：
1986
期刊：
The Journal of experimental biology
影响因子：
--
作者：
Rountree,DB;Bollenbacher,WE
通讯作者：
Bollenbacher,WE