IMMUNOHISTOCHEMICAL DETECTION OF VITELLOGENIN IN THE OVARY AND FAT BODY DURING A REPRODUCTIVE CYCLE OF THE COCKROACH, BLATTELLA GERMANICA

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Abstract
Vitellogenin was immunohistochemically demonstrated in the ovary and fat body during a reproductive cycle. In terminal oocytes of 4-day adults, vitellogenin began to appear in yolk spherules at the cell periphery. The vitellogenin-containing spherules increased in size and number to occupy the whole cell 2 days later. In the female fat body, vitellogenin began to appear in 3-day adults. It was distributed diffusely in the cytoplasm, at a much lower concentration than in the oocytes, during the vitellogenic period. In 11-day adults whose vitellogenesis had terminated, a higher concentration of vitellogenin was found in the cytoplasmic inclusions of the fat body. Vitellogenin was not detected in the male fat body.