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| 題 名 | Induction of Nitrogen Fixing (Acetylene Reduction) Activity of Rhizobia Growing Symbiotically and Asymbiotically with Soybean Callus Tissues=誘導根瘤菌產生固氮活性之研究 |
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| 作 者 | 黃啟穎; | 書刊名 | 國立臺灣大學理學院植物學系研究報告 |
| 卷 期 | 25 1980.08[民69.08] |
| 頁 次 | 頁38-47 |
| 關鍵詞 | 固氮活性; 根瘤菌; |
| 語 文 | 英文(English) |
| 英文摘要 | The rhizobium-soybean callus association in both symbiotic or asymbiotic system caused the R. japonicum to establish an acetylene reduction (nitrogen fixation) system. The symbiosis between rhizobium and callus was not an obligative requirement for the induction of nitrogenase synthesis in rhizobia. However, some unknown critical substance(s) produced by the callus is required to initiate the nitrogenase synthesis in the rhizobium. The rhizobia in the symbiotic rhizobium-callus system has 10 3 times higher nitrogen fixing activity than those in the asymbiotic system. The development of nitrogenase in rhizobium in both systems, unlike in intact plant, was not inhibited by the presence of combined nitrogen in medium. The nitrogen fixation might not be interfered by the nitrate assimilatory processes. The callus could regulate the nitrogen fixing activity of rhizobia but the level of rhizobial nitrogen fixation could not delay the senescence of callus tissues. The rhizobial nitrogen fixing activity declined at the time of callus tissue senesced. |
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