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Ultra-structural and physico-chemical characterization of eggs and egg hairs (setae) of the new invasive pest, fall armyworm, Spodoptera frugiperda (J. E. Smith) in India: A first report
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-01-14 , DOI: 10.1002/jemt.23698 Malaichamy Kannan 1 , Kolanthasamy Elango 2 , Manickavasagam Kalyanasundaram 2 , Kasivelu Govindaraju 3
Microscopy Research and Technique ( IF 2.0 ) Pub Date : 2021-01-14 , DOI: 10.1002/jemt.23698 Malaichamy Kannan 1 , Kolanthasamy Elango 2 , Manickavasagam Kalyanasundaram 2 , Kasivelu Govindaraju 3
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In this study, we report first time in India on the morphology, ultra-architectural pattern of the chorion in the egg and egg hair (setae). Further, physico-chemical characterizations of egg hairs (setae) were studied in the new invasive pest, fall armyworm, Spodoptera frugiperda. The egg is dome shaped with flattened base and curves upward to a broadly rounded point at the apex. HR-SEM micrographs revealed the surface ultrastructure of eggs chorion and shows structural elements of a marked rosette of petals surround the micropyle followed by micropylar rosette region around the micropyle plate. There was a small single micropylar opening along with 9 micropylar rosette cells and 13 micropylar rosette zones present near to the micropylar pit. In the egg the first order ribs were absent, but around 58–60 numbers of second order ribs were present. All the ventral and lateral cells of the eggs are connected by 19–22 cross striae and not forming a grid pattern, but joints with the longitudinal ribs at several of angles and totally 1,277–1,495 convex cells present at the egg's surface. The physico-chemical characteristics of egg hairs were studied using Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA) analysis. TGA results show that three weight losses occurred at 142, 418, and 880°C, respectively. FT-IR confirms the presence of amides, sulfoxide, and nitro compounds in egg hairs (setae).
中文翻译：
印度新入侵害虫秋粘虫、草地贪夜蛾（JE Smith）的卵和卵毛（刚毛）的超结构和物理化学特征：第一份报告
在这项研究中，我们首次在印度报告了卵和卵毛（刚毛）中绒毛膜的形态、超结构模式。此外，研究了新入侵害虫秋粘虫、草地贪夜蛾中卵毛（刚毛）的理化特征。. 卵呈圆顶状，底部平坦，向上弯曲至顶点处的宽圆点。HR-SEM 显微照片揭示了卵绒毛膜的表面超微结构，并显示了微孔周围显着的花瓣玫瑰花结的结构元素，然后是微孔板周围的微孔玫瑰花结区域。在珠孔坑附近有一个小的单珠孔开口以及9个珠孔莲座细胞和13个珠孔莲座区。鸡蛋中没有一级肋骨，但存在大约 58-60 条二级肋骨。卵的所有腹侧和侧细胞由19-22条横纹连接，不形成网格状，而是与纵肋成多个角度连接，卵表面共有1,277-1,495个凸细胞。使用傅里叶变换红外 (FT-IR) 和热重分析 (TGA) 分析研究卵毛的理化特性。TGA 结果表明，三个重量损失分别发生在 142、418 和 880°C。FT-IR 证实了卵毛（刚毛）中存在酰胺、亚砜和硝基化合物。
更新日期：2021-01-14
中文翻译：
印度新入侵害虫秋粘虫、草地贪夜蛾（JE Smith）的卵和卵毛（刚毛）的超结构和物理化学特征：第一份报告
在这项研究中，我们首次在印度报告了卵和卵毛（刚毛）中绒毛膜的形态、超结构模式。此外，研究了新入侵害虫秋粘虫、草地贪夜蛾中卵毛（刚毛）的理化特征。. 卵呈圆顶状，底部平坦，向上弯曲至顶点处的宽圆点。HR-SEM 显微照片揭示了卵绒毛膜的表面超微结构，并显示了微孔周围显着的花瓣玫瑰花结的结构元素，然后是微孔板周围的微孔玫瑰花结区域。在珠孔坑附近有一个小的单珠孔开口以及9个珠孔莲座细胞和13个珠孔莲座区。鸡蛋中没有一级肋骨，但存在大约 58-60 条二级肋骨。卵的所有腹侧和侧细胞由19-22条横纹连接，不形成网格状，而是与纵肋成多个角度连接，卵表面共有1,277-1,495个凸细胞。使用傅里叶变换红外 (FT-IR) 和热重分析 (TGA) 分析研究卵毛的理化特性。TGA 结果表明，三个重量损失分别发生在 142、418 和 880°C。FT-IR 证实了卵毛（刚毛）中存在酰胺、亚砜和硝基化合物。
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