Retinal Adaptation in Response to Light and Dark Regimes in the Oriental Armyworm Mythimna separata (Lepidoptera: Noctuidae)

被引:0
|
作者
Chen, Qing-Xiao [1 ]
Han, Ying [1 ]
机构
[1] Henan Univ Sci & Technol, Coll Hort & Plant Protect, Lab Insect Evolut & Systemat, Luoyang 471000, Peoples R China
关键词
compound eye; superposition eye; ommatidium; retina; rhabdom; moth; Insecta; COMPOUND EYE; SEXUAL-DIMORPHISM; PIGMENT MIGRATION; MOTH; COLEOPTERA; INSECTS;
D O I
10.3390/insects15020135
中图分类号
Q96 [昆虫学];
学科分类号
摘要
The oriental armyworm, Mythimna separata (Walker), is a well-known nocturnal migratory pest that relies on its exceptional nocturnal vision for navigation during long-distance flights. In this study, we investigated the ultrastructure of the compound eyes of adult M. separata using transmission electron microscopy and quantitatively evaluated adaptational changes in the retina under light and dark conditions. The compound eyes of M. separata are superposition eyes with a clear zone. The retina shows remarkable anatomical differences under light and dark adaptation, primarily characterized by distinct patterns of rhabdoms within the clear zone: the rhabdoms are nearly absent under light adaptation, but become more voluminous under dark adaptation. In the distal, middle, and proximal sections of the clear zone, the cross-sectional areas of retinulae and rhabdoms, as well as the rhabdom occupation ratio, are significantly larger under dark adaptation than under light adaptation. Conversely, the opposite trend is observed beneath the clear zone. These results indicate remarkable plasticity in the M. separata retina throughout a normal daily cycle, providing a theoretical basis for improving searchlight and ground light trap techniques for the management of this migratory species.
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页数:11
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