イネ体におけるプロパホスの代謝・移行とツマグロヨコバイに対する殺虫活性との関係 Relation of Metabolism and Translocation of Propaphos in Rice Plant to Insecticidal Activity against Two Strains of Green Rice Leafhopper

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著者

    • 加藤 義郎 KATO Yoshiro
    • 日本化薬 (株) 農薬事業部上尾研究所 Ageo Research Laboratory, Agrochemicals Division, Nippon Kayaku Co., Ltd.
    • 浅香 四郎 ASAKA Shiro
    • 日本化薬 (株) 農薬事業部上尾研究所 Ageo Research Laboratory, Agrochemicals Division, Nippon Kayaku Co., Ltd.
    • 湖山 利篤 KOYAMA Toshiatu
    • 日本化薬 (株) 農薬事業部上尾研究所 Ageo Research Laboratory, Agrochemicals Division, Nippon Kayaku Co., Ltd.

抄録

水耕法で栽培したイネと, これを吸汁したツマグロヨコバイにおけるプロパホスの挙動を調べ, その殺虫性を明らかにせんとした. イネ体では, 根部に吸収, 蓄積されたプロパホスは, 葉鞘, 葉身に移行し, そこで酸化体であるスルホキシドやスルホンに代謝された. とくに葉尖ではスルホン体の濃度が高かった. このイネを吸汁した時, ツマグロヨコバイのKT<sub>50</sub>値とイネ体内のS, SO, SO<sub>2</sub>体濃度との間に高い相関が認められた. また, 虫体内濃度とそれに対応するイネ体内濃度の分析結果から, 以下のことが明らかになった. 1) イネ体地上部に分布するSO, SO<sub>2</sub>体はS体と同様, 殺虫活性成分として作用する. 2) 高濃度の殺虫成分を含むイネを吸汁した虫の死亡個体からは高濃度の殺虫成分が検出された. 3) イネ体内濃度と虫体内濃度との間に高い相関が認められた. 4) イネ体とこれを吸汁した虫の体内のS, SO, SO<sub>2</sub>体の存在比率を比較すると, 虫体のほうが酸化代謝が進行しており, 酸化体の比がより高かった. 5) 感受性の異なる2種のツマグロヨコバイ間では, 抵抗性種の体内濃度は感受性種のそれより低く, 両者間にプロパホスの代謝, 解毒能力の差が存在することが推定された.

Some behaviours of propaphos (<i>O</i>, <i>O</i>-di-n-propyl <i>O</i>-4methylthiophenyl phosphate, Kayaphos<sup>®</sup>) in the rice plants grown in water culture and in the two strains of green rice leafhoppers fed on these rice plants were examined to elucidate its insecticidal activity.<br>In the rice plants, propaphos absorbed and accumulated in the roots was translocated gradually to the sheaths and the leaf blades, in which the chemical was oxidized to its sulfoxide and selfone derivatives. Especially in the top part of the leaves, marked concentration of sulfone was detected.<br>When the leafhoppers were fed on these rice plants, it was found that there were several high correlations between KT<sub>50</sub> of the insects and the concentrations of propaphos and its oxidative metabolites in the rice plants.<br>Based on the results of analysis of propaphos and its oxidative metabolites in the rice plants and in the insects, it was indicated that (1) the oxidative metabolites in the rice plants were similarly insecticidal against the leafhoppers, (2) the insects fed on the rice plants containing high concentration of the chemicals were found to have higher concentration than the lethal threshold, (3) there was a correlation between the concentration of the chemicals in the rice plants and that in the insects, (4) propaphos was oxidized to its sulfoxide and sulfone derivatives in the insects at a higher rate than in the rice plants, (5) the insects of resistant strain seemed to detoxify the chemicals faster than the susceptible strain.

収録刊行物

  • 日本農薬学会誌(Journal of Pesticide Science)

    日本農薬学会誌(Journal of Pesticide Science) 4(4), 439-446, 1979

    日本農薬学会

各種コード

  • NII論文ID(NAID)
    130004093436
  • 本文言語コード
    UNK
  • ISSN
    1348-589X
  • データ提供元
    J-STAGE 
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