Silicon-Dependent Promotion of Superoxide Generation Following the Inoculating of Magnaporthe grisea into Rice Leaves

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  • いもち病菌接種時のイネにおけるケイ素による活性酸素の生成助長
  • イモチ ビョウキン セッシュジ ノ イネ ニ オケル ケイソ ニ ヨル カッセイ サンソ ノ セイセイ ジョチョウ

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Abstract

Generation of superoxide was measured in rice (Oryza sativa L.) treated with silicon during the post-inoculation of Magnaporthe grisea. 1) As for rice plants that had been grown in soil, the superoxide anion (O_2^-) was generated in higher levels in rice which had been treated with potassium silicate than in the non-treated rice at 0-0.25 h after the inoculation. No other drastic change in the levels of O_2^- generation was found. 2) As for rice plants that had been grown hydroponically, O_2^- was generated in higher levels in rice which had been treated with potassium silicate than in the non-treated rice at 0.25-0.50 h after the inoculation. No other drastic change in the levels of O_2^- generation was found. 3) These results indicate a possibility that silicon amplifies the recognition signals after the pathogenic fungus infection. This is the first report that shows that silicon promotes the generation of active oxygen after a pathogenic fungus infection.

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