Xie Hua, Yuan Hui, Wang Yuyun, Tang Xinyu, Yang Meiru, Zheng Li, Li Zongbo
Key Laboratory of Forest Disaster Warning and Control in Yunnan Province, Southwest Forestry University, Kunming 650224, China.
College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China.
Biology (Basel). 2025 Aug 11;14(8):1032. doi: 10.3390/biology14081032.
, a notorious forest pest in southwest China, primarily employs infochemicals to coordinate mass attacks that overcome host tree defenses. However, secondary visual cues, particularly detection of host color changes, also aid host location. This study characterized the compound eye structure and vision of using electron microscopy and phototaxis tests. The apposition eye contains 224-266 ommatidia, with asymmetry between left and right. Quadrilateral facets occupy the dorsal third, while hexagonal facets dominate elsewhere. Each ommatidium comprises a large corneal lens, an acone-type crystalline cone from four cone cells, and an open-type rhabdom formed by eight retinular cells (R7-R8 centrally, R1-R6 peripherally), surrounded by two primary and at least seventeen secondary pigment cells. Dark/light adaptation alters cone size/shape and rhabdom cross-sectional area/outline (without pigment granule movement) to regulate light reaching the photoreceptors. Behavioral observations showed peak flight activity occurs between 7:00-11:00 AM, with no nighttime activity. Phototaxis tests revealed females are highly sensitive to 360 nm, 380 nm, and 700 nm wavelengths, while males exhibit high sensitivity to 360 nm and 400 nm. This work enhances knowledge on the integration of visual and olfactory sensory information in beetles for host location and non-host avoidance.
作为中国西南地区一种臭名昭著的森林害虫，主要利用信息化合物来协调大规模攻击，以克服寄主树的防御。然而，次要的视觉线索，特别是对寄主颜色变化的察觉，也有助于找到寄主。本研究利用电子显微镜和趋光性测试对[害虫名称未给出]的复眼结构和视觉进行了表征。并列眼包含224 - 266个小眼，左右不对称。四边形小眼面占据背侧三分之一，而六边形小眼面在其他地方占主导。每个小眼由一个大的角膜透镜、由四个晶锥细胞组成的尖锥型晶锥以及由八个小网膜细胞（中央为R7 - R8，周边为R1 - R6）形成的开放型视杆组成，周围有两个初级色素细胞和至少十七个次级色素细胞。暗/光适应会改变晶锥大小/形状和视杆横截面积/轮廓（无色素颗粒移动），以调节到达光感受器的光线。行为观察表明，飞行活动高峰出现在上午7:00 - 11:00之间，夜间无活动。趋光性测试显示，雌性对360 nm、380 nm和700 nm波长高度敏感，而雄性对360 nm和400 nm高度敏感。这项工作增进了我们对甲虫视觉和嗅觉感官信息整合以定位寄主和避开非寄主的了解。
