Chapman R F
Division of Neurobiology, University of Arizona, Tucson, Arizona 85721, USA.
J Morphol. 2002 Nov;254(2):186-94. doi: 10.1002/jmor.10026.
The development of diet-induced phenotypic differences in numbers of sensilla on the antennae of the grasshopper Schistocerca americana was studied using the exuviae produced at each molt. This made it possible to follow changes within an individual insect. In the first instar, insects had similar numbers of four sensillum types: uniporous trichoid sensilla, coeloconic sensilla, and large and small multiporous basiconic sensilla. Rearing on lettuce resulted in sixth instars with greater numbers of three sensillum types than siblings reared on an artificial diet. The first statistically significant differences between treatments in numbers of trichoid sensilla and large basiconic sensilla occurred in the third and fourth instars, respectively. No major reductions in sensillum numbers occurred at any time and the phenotypic differences resulted from differences in the numbers added at each molt.
利用美洲沙漠蝗每次蜕皮产生的蜕壳，研究了饮食诱导的该蝗虫触角上感器数量的表型差异。这使得追踪单个昆虫体内的变化成为可能。在第一龄期，昆虫的四种感器类型数量相似：单孔毛形感器、腔锥感器以及大小多孔锥形感器。以生菜饲养的蝗虫到第六龄期时，三种感器类型的数量比以人工饲料饲养的同胞更多。毛形感器和大型锥形感器数量在处理间的首次统计学显著差异分别出现在第三龄期和第四龄期。在任何时候，感器数量都没有大幅减少，表型差异是由每次蜕皮时增加的数量差异导致的。
