家蚕における脂肪組織とその主な含有成分の量的変化について

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  • On the Change in the Weight of the Fat Body and of Its Chief Constituents in the Silkworm, <i>Bombyx mori</i> L., during Metamorphosis
  • カサン ニ オケル シボウ ソシキ ト ソノ オモナ ガンユウ セイブン ノ リョウテキ ヘンカ ニ ツイテ エイブン

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Daily change in the dry weight of the fat body of the silkworm and in its chief constituents was measured during metamorphosis, from the first day of the fifth larval instar to the early pupal stage.<br>The dry weight of the fat body rapidly increases from the first day of the fifth instar until it attains the maximum value at the end of the spinning stage. After spinning, the weight decreases with age. The female is always superior to the male in the weight of the tissue and this difference becomes more obvious after the ripenning stage.<br>The change in content of three chief constituents, i.e., lipid, protein and glycogen, was examined. The content of lipid rapidly increases from the initial period of the last larval instar until it reaches the maximum value at the pupation time, and that of glycogen begins to rise from the middle period of this instar and attains the maximum level at the ripenning stage. Protein content rises during the former half period of this instar until it reaches a constant value during the latter half period, followed by a sudden increase in the spinning stage.<br>As to change in the ratio among three chief constituents, the ratio of lipid and glycogen fluctuates in the same manner and the maximum value of both materials is attained at the ripenning stage. The ratio of protein, however, fluctuates antagonistically as in others, that is, the minimum value is shown at that time. Throughout the development, the ratio of lipid is superior to that of other constituents.<br>Acknowledgement. Grateful acknowledgement is made to Dr. M. HARIZUKA for his kind help during the experiment and in revising manuscript.

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