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投稿者 メラトニン 日時 2000 年 8 月 24 日 12:56:47:
回答先: Re: 幼虫の死亡率について 投稿者 ちょっと考えること 日時 2000 年 8 月 24 日 08:47:21:
> 普通のトウモロコシの花粉で死んじゃう幼虫の
>パーセンテージはどのくらいなんでしょう？
論文の要約です。
Field deposition of Bt transgenic corn pollen: lethal effects on the
monarch butterfly
Laura C. Hansen Jesse and John J. Obrycki,
Department of Entomology, Iowa State University, Ames, IA 50011, USA
Abstract: We present the first evidence that transgenic Bacillus thuringiensis
(Bt) corn pollen naturally deposited on Asclepias syriaca; common milkweed, in a
corn field causes significant mortality of Danaus plexippus L. (Lepidoptera:
Danaidae) larvae. Larvae feeding for 48 h on A. syriaca plants naturally dusted
with pollen from Bt corn plants suffered significantly higher rates of mortality
at 48 h (20±3%) compared to larvae feeding on leaves with no pollen (3±3%), or
feeding on leaves with non-Bt pollen (0%). Mortality at 120 h of D. plexippus
larvae exposed to 135 pollen grains/cm2 of transgenic pollen for 48 h ranged
from 37 to 70%. We found no sub-lethal effects on D. plexippus adults reared
from larvae that survived a 48-h exposure to three concentrations of Bt pollen.
Based on our quantification of the wind dispersal of this pollen beyond the
edges of agricultural fields, we predict that the effects of transgenic pollen
on D. plexippus may be observed at least 10 m from transgenic field borders.
However, the highest larval mortality will likely occur on A. syriaca plants in
corn fields or within 3 m of the edge of a transgenic corn field. We conclude
that the ecological effects of transgenic insecticidal crops need to be
evaluated more fully before they are planted over extensive areas.
題名には必ず「阿修羅さんへ」と記述してください。