越冬イラガ幼虫の耐凍性機構

NDLデジタルコレクション

書誌事項

タイトル別名
  • Resistance mechanism to frost injury of overwintering slug chaterpillar

この論文をさがす

説明

The mechanism for the resistance to frost injury of a typical frosthardy "slug caterpillar" (Cnidocampa flavescens) was studied. Using the blood and isolated organs as well as the intact body at various stages of the caterpillar, the freezing process was observed. Even for a long period of more than 75 days, the overwintering prepupae can survive under the frozen state at about -15℃ without any harm to the further development and nor to that of the next generation. When supercooling of the body is lost, the blood suddenly begins to freeze, and in thus frozen insects ice which has been in contact with the organs is not able to seed the ice in the tissue cells, con sequently they are only dehydrated and contracted. The isolated organs artificially frozen with blood, when thawed, recover their normal activity even after the severe freezing at -20℃. The "intra cellular freezing" usually resulted in collapse of the cell structure and in total loss of the vital activity without exception. In the overwintering period of the frost-hardy insects, properties of the plasmic membrane and the blood which have suffered some changes may play an imprtant role for the preventing the freezing of the interior of the tissue cells. According to our studies on several other insects, the freezing process of common caterpillars, even in the unhardy states, seems to be the "extra cellular freezing" at least under a slow freezing, and the freezing exerts no harmful effects on the caterpillars, if the freezing temperatures are not too low and the duration of the freezing is very short.

収録刊行物

  • 昆蟲

    昆蟲 20 (1・2), 11-17, 1953-10-25

    東京昆蟲學會

詳細情報 詳細情報について

問題の指摘

ページトップへ