第一白卵(w-1)のカイコ幼虫の明暗順応による走光性の符号転換

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  • Change of phototactic sign with light-and dark-adaptation in an ommochrome-less mutant (w-1) of the silkworm larvae Bombyx mori.
  • 第一白卵（ｗ‐１）のカイコ幼虫の明暗順応による走光性の符号転換
  • ダイ 1 ハクラン w-1 ノ カイコ ヨウチュウ ノ メイアン ジュンノウ

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Phototactic response of an ommochrome pigment-less mutant (w-1) of the silkworm, Bombyx mori, was investigated. The light intensity response curves varied with light- and dark-adaptive stages of the newly-hatched larvae. After light-adaptation the larvae showed a positive phototaxis at low intensities of the yellow test-light, but a negative phototaxis at high intensities. After dark-adaptation they showed negative phototactic responses to all intensities of test light. The halftimes of the sign reversion in the response by light- or dark-adaptation were 20-30min. Green light (500-560nm) was effective in both positive and negative responses. After light-adaptation, mature w-1 larvae moved toward a light source with a klinotactic behavior, but dark-adapted larvae moved away from it. The results of crosses between w-1 and other positive-phototactic races showed that the genetic factor determining the characteristics of phototactic response of w-1 is completely recessive.

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