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題 名 | Effect of L-Arginine and Its Analogues on the Hypersensitive Response of Tobacco (Nicotiana Tabacum L. cv. TT-5) Induced by Avirulent Ps61 Strain of Ralstonia Solanacearum=精氨酸與其結構類似物對無毒力青枯病菌 (Ralstonia Solanacearum) Ps61菌株在菸草所誘發過敏性反應之影響 |
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作 者 | 周俊吉; 李敏惠; 曾國欽; 曾德賜; | 書刊名 | 植物病理學會刊 |
卷 期 | 15:2 民95.06 |
頁 次 | 頁97-105 |
分類號 | 434.82 |
關鍵詞 | 無毒力青枯病菌; 菸草; L-arginine; Hypersensitive reaction; Nitric oxide; |
語 文 | 英文(English) |
英文摘要 | An L-arginine enhancement effect on hypersensitive response (HR) was observed in tobacco (Nicotinana tabacum cv. TT-5) challenge-inoculated with an avirulent Ps61 strain of Ralstonia solanacearum. The enhancement effect was dosage dependent, and symptom expression appeared to bo a function of the challenging bacteria. The effect of arginine became prominent at concentration greater than 1 mM, which was manifested by the development of earlier and everernecrotic HR symptoms compared to that of the controls. The accelerated necrogenic resonse reflected the functioning of a promoted active defense triggered by the challenging bacterium. However, there was no indication of increased toxigenic effect since the rate of population decline of Ps61 during the course remained nearly unchanged when treated with L-arginine. In contrast to the arginine promoting effect, the application of arginine analogues (NMA, NAME or canavanine), and guanidine compounds (methyl-guanidine or aminoguanidine), greatly retarded and reduced the necrotic response. Canavanine and amionoguanidine were among them the most effective, whereas the supplementation of L-arginine reversed the inhibitory effect of canavanine. The observed enhancement effect of arginine and the differential inhibitory activity of arginine analogues and guanidine compounds suggested that the role of an inducible nitric oxide synthas may play a role in the studied HR in tobacco. |
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