Relative studies on the median neurosecretory cells and primary oocytes in the female Dysdercus cingulatus (Hemiptera: Pyrrhocoridae)

S.M. Mahboob Hassan^a*, Seema Kumari & Anju Kumari^b
a*Department of Zoology, Patna Science College,
^bPatna University, Patna, (Bihar) India
Received , 20th November, 2014; Revised: 20th December, 2014

Abstract :Dysdercus cingulatus is a common pest of cotton plants. The neurosecretory cells are found in the Protocerebrum of the brain. The median neuroseceretory cells (MNSC) of female Dysdercus cingulatus is one of the most important neuroendocrine glands which play a central role in the development of oocytes in the ovariole. The relative studies on the development of median neurosecretory cells and the development of primary oocytes were investigated from freshly moulted female to oviposited female Dysdercus cingulatus. The median neurosceretory cells have increased activity in relation to the development of primary oocytes in the ovariole of the female. In freshly moulted female, the median neurosecretory cells contained little statiable neurosecretory material (NSM) and the primary oocytes have grown minimum in size with little amount of yolk. In seven days to nine days old female, the median neurosecretory cells and the primary oocyte also developed with increased amount of yolk. In twenty four days old female, the median neurosecretory cells and the primary oocytes were attained maximum in size but neurosecretory cells contained sparse amount of neurosecretory material (NSM) in their perikarya during the oviposition. The median neurosecretory cells shows increased activities during the entire period of the maturation of primary oocytes and formation of eggs in the ovaries of female Dysdercus cingulatus.

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