アオムシコマユバチApanteles glomeratus L.の寄生をうけたモンシロチョウ幼虫Pieris rapae crucivora BOISDUVAL体液内にみられる巨細胞の数について

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The anterior and posterior serosa of Apanteles embryo just before hatching are composed of hypertrophied serosal cells (Kitano, 1965). When parasitoid eggs hatch, these serosal cells separate each other and are released into the host's hemolymph as spherical cells averaging 17-24 μ in diameter. These "giant cells"(Kitano, 1962, 1965) continue to increase in size as the parasitoid larvae develop. A great number of "giant cells" averaging 90-120 μ in diameter are still in the body cavity of the fifth-instar larva of Pieris after the emergence of the second-instar larvae of Apanteles. The present investigation was undertaken in order to determine the number of these "giant cells" derived from one egg of the parasitoid and to examine whether or not changes in the number occurred as the parasitoid larva developed. It has been known that the nutrition of the first-instar larva of the parasitoid depends on diffuse food in the host's hemolymph, but the second-instar larva feeds actively by selecting fat body of the host (Junikkala, 1966). Therefore, the mean number of "giant cells" originated from one egg was evaluated by the following method: The host larva 6 days after oviposition of the parasitoid was dissected in saline for Bombyx under a binocular microscope and we counted the total number of "giant cells" and that of the first-instar larvae of Apanteles in the host. The results of observations showed that the number of "giant cells" released by one egg of the parasitoid was 120.3-cells in average. In a similar manner, we determine the total number of "giant cells" in host hemocoel after the emergence of the parasitoid larvae and the number of the third-instar larvae of the parasitoid. The results showed that the number of "giant cells" per last instar larva of Apanteles was a 74.5-cells average. From these results, it seems most reasonable to conclude that the number of "giant cells" originated from a parasitoid larva was significantly decreased from a 120.3-cells in average to a 74.5-cells in average as the parasitoid larva develops. We can speculate either that "giant cells" might constitute the food of the parasitoid larvae or that grown-up "giant cells" might disintegrate in the host's hemolymph. However it is difficult from the present investigation alone to determine the factors for the decrease in number of "giant cells".
社団法人日本動物学会の論文
1971-09-15

アオムシコマユバチApanteles glomeratus L.の寄生をうけたモンシロチョウ幼虫Pieris rapae crucivora BOISDUVAL体液内にみられる巨細胞の数について

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