Morphological study on hemocytes of Locusta migratoria manilensis
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Key Words:Locusta migratoria manilensis, hemocyte, morphology
Abstract: Light microscopy and the Wright stain method revealed four types of hemocytes; prohaemocytes, plasmatocytes, granulocytes and oenocytoids, in Locusta migratoria manilensis (Meyen). Prohaemocytes’ had a red nucleus, whereas the nucleus of the other three haemocytes was dyed red and blue by Wright’s dye. Plasmatocytes are considered to be disintegrated prohaemocytes and can be further differentiated into rednucleus plasmatocytes and bluenucleus plasmatocytes. Bluenucleus plasmatocytes evolve into bluenucleus granulocyte and oenocytoids whereas rednucleus plasmatocytes evolve into rednucleus granulocyte and oenocytoids. Granulocytes are differentiated into largegranular granulocytes and smallgranular granulocytes, the latter are differentiated into exiguous and dense small granular granulocytes. Hemocytes of L. m. manilensi can therefore be divided into four main types with eleven subtypes. This study not only provides a basis for grasshopper morphology, but also grasshopper physiology, immunity and locust control.