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In the present paper, some biochemical characteristics of the protein fractions of which increased in leaves inoculated with Helminthosporium oryzae are discussed. 1. Neither spore germination nor the elongation of germ tubes was inhibited by the protein fraction increased in the inoculated leaves. 2. Catalase activity was increased markedly in the protein fraction eluted with 1.0M tris buffer (pH 7.2), while no β-amylase activity was detected in the protein fraction. Unexpectedly the protein fraction inhibited β-amylase activity. The β-amylase inhibition by the proteins was discussed in relation to the mechanism of starch accumulation which was found usually in the surrounding area of diseased spot. 3. The amino acid contents of protein fraction eluted with 0.5M tris buffer (pH 7.2) were analysed by using amino acid auto-analyser. The protein fraction obtained from diseased leaves contained more aspartic acid and less glutamic acid than that from healthy leaves. (Received May 11, 1967) 前報 において筆者 らは病原菌 の侵入に よつてイネ葉 の蛋白量が増加することを述べたが,こ れは寄主,寄 生菌間の一つ の特異的な反応 として過敏感反応,と く に呼吸の増加な ど疾病抵抗性の問題に関連した一連の 代謝活性によるものと考えた。 したがつて,筆 者 らは この蛋 白増加を瓜谷5,6,14,15),冨山ら18)の報告 した酸 化酵素な どを含めた 新たな 酵素蛋白 の合 成(denovo 合成 も含める)と 代謝 制御 に あ ず か る 物 質 生 産 (repressor, co-repressorま たは毒素)と にわけて検 討 したい と考えてい る。 ここでは とくに増加 した蛋白 フラクションの植物病理学的性質 と2, 3の 生化学的 性質についての実験結果 を報告する。

Increased Proteins in Diseased Leaves of Rice Plants in the Early Stage of Infection by Helminthosporium oryzae