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Morphology and histology of the alimentary canal of Lygus hesperus (Heteroptera: Cimicomoropha: Miridae)

Annals of the Entomological Society of America

By:
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DOI: 10.1603/0013-8746(2008)101[159:MAHOTA]2.0.CO;2

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Abstract

Microdissection and transverse semithin sections were used to perform a light microscopy survey of the gross morphology and cellular anatomy of the alimentary canal, respectively, of Lygus hesperus Knight, a key pest of cotton (Gossypium hirsutum L.), alfalfa (Medicago sativa L.), and other crops. The gross morphology of the alimentary canal showed a relatively unadorned tube compared with other hemipterans, with variably shaped compartments and one small diverticulum. However, the epithelial cell anatomy of the gut was relatively complex, with the midgut having the most diverse structure and cell types. The midgut was typical of the "Lygus-type gut" seen in the older literature, i.e., it consisted of three major regions, the first (descending), second (ascending), and third (descending) ventriculi, with different variants of three major epithelial cell types in each region. Our light microscopy (LM) study suggests that the three cell types are nondifferentiated regenerative cells (which sparsely occurred throughout the midgut but were abundant in the anterior region of the first ventriculus), endocrine cells, and columnar cells. Although the Lygus gut cells strongly resemble those cell types seen in other insects, their identification should be confirmed via transmission electron microscopy to be considered definitive. These cell types differed in the size and opacity of vesicles, geometry of cell surface in the gut lumen, and size, shape, and concentration of brush-border microvilli and location within the gut. Comparison of gut structure in L. hesperus with that of other hemipterans, especially in relation to hemipteran phylogeny and feeding strategies, is discussed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Morphology and histology of the alimentary canal of Lygus hesperus (Heteroptera: Cimicomoropha: Miridae)
Series title:
Annals of the Entomological Society of America
DOI:
10.1603/0013-8746(2008)101[159:MAHOTA]2.0.CO;2
Volume
101
Issue:
1
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Annals of the Entomological Society of America
First page:
159
Last page:
171
Number of Pages:
13