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Anatomy, histology and ultrastructure of the haemopoietic organs of Spodoptera litura



Anatomy, histology and ultrastructure of the haemopoietic organs of Spodoptera litura



Acta Entomologica Sinica 35(3): 285-289



The histology and ultrastructure of the haemopoietic organs of the larvae of Spodoptera litura in fourth to sixth instars were examined with light, transmission and scanning electron microscopes. It was observed that each of the haemopoietic organs was composed of a number of spindle-shaped cells and many cellular islets of various size sheathed together with an acellular membrane adhering to the wing bud at its base. The spindle-shaped cells may be single or serial, and have a low ratio of cytoplasm to nuclei; and their cytoplasm contains few organelles, showing their embryonic nature. They are the stem cells of the haemopoietic organs and the new cellular islets are formed through their division. The young cellular islets assume compact form, with the prohaemocytes closely juxtaposed; while the more developmentally advanced islets are in reticulate form, as the intercellular connections gradually tend to disappear. A few differentiated plasmatocytes (PL), granulocytes (GR) and spherulocytes (SP) were found in the reticulate islets. A mixed type of cell with GR form at one end and SP form at another was also observed in the islet. The acellular membrane sheathing the islets is less than 50 mu-m in thickness and continuous at the beginning; it gradually leaks as the volume of the islet increases during development; and finally it breaks down to expose blocks of cells to haemolymph. Then blood cells go into haemolymph from the blocks of cells. The total haemocyte counts (THC) in the haemolymph are closely related to the release of blood cells from the haemopoietic organs. Before and shortly after ecdysis, many blocks of cells could be found in the haemopoietic organs and the THC was high in the haemolymph. When the blocks of cells completely disappeared from the haemopoietic organs, the THC attained the highest value.

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Accession: 002301328

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