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題 名 | The Transition of Rhizobium Fredii Lipopolysaccharides Induced by Soybean Root Exudation=根瘤菌Rhizobium fredii脂多醣體由大豆根分泌物所誘導的轉變 |
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作 者 | 宋樹群; 林良平; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 40:1 1999.01[民88.01] |
頁 次 | 頁73-78 |
分類號 | 434.218 |
關鍵詞 | 慢生性大豆根瘤菌; 脂多醣體; 快生性大豆根瘤菌; 根分泌物; Bradyrhizobium japonicum; Lipopolysaccharide; Rhizobium fredii; Root exudation; |
語 文 | 英文(English) |
中文摘要 | 豆科植物根分泌物中的化合物會誘導根瘤菌的脂多醣體結構與成分的 轉變。吾人收集大豆幼苗洗出液及萌芽培養液,並加至細菌培養液中,再以此培 養基培養Rhizobium及Bradyrhizobium的菌株。這些菌株的脂多醣體分離後以分 子篩層析法純化後並以SDS-PAGE分析。由分子篩層析法與SDS-PAGE的結果, 不同菌株及培養基是否含根分泌物均呈不同的表現。由分子篩層析法的圖譜可得 知這些菌株的脂多醣體分子量的範圍受到大豆根分泌物誘導而改變。在 SDS-PAGE分析結果中,LPS-II因大豆根分泌物誘導顯現較密實的染色帶。在成 分分析的結果,Rhizobium fredii TU6,R. meliloti ATCC9930,R. leguminosarum bv. viciae ATCC 10004及Bradyhizobium japonicum USDA 110的脂多醣體KDO比 率因加入大豆根分泌物而增加,但是Rhizobium fredii KR23,R. loti Lu7及R. loti ATCC33669則成減少的表現。在hexuronate比例方面除了R. loti Lu7以外,其 餘菌株均成增加的表現。此一分析結果與SDS-PAGE的結果一致。因此,本論 文肯定大豆根分泌物會誘導根瘤菌的脂多醣體結構的變異。 |
英文摘要 | The chemical compounds contained in legurninous plant root exudation induce structural and compositional transitions of the lipopolysaccharides of Rhizobium that occur during rhizobia-legume symbiotic infection processes. The root exudate was extracted from the seed germinated solution and seedling roots of soybean. We added the exudation to bacteria cultured medium. Rhizobium and Bradyrhizobium strains were purified through gel filtration chromatography followed by SDS-PAGE analysis. Different chromatographic and SDS-PAGE patterns among the different rhizobia strains were obtained. We determined by means of the gel filtration chromatography that soybean root exudations induced a molecular weight range change in the lipopolysaccharides of these strains. The band of this LPS-II region exhibited diffused patterns in SDS-PAGE as a result of soybean root secretion. The LPS-I region of four strains cultured in TY medium with root exudates exhibited clearer and denser bands than those of rhizobia from TY medium without added soybean root exudates. Based on the composition analysis, we found that the KDO ratio increased in R. fredii TU6, R. melilooti ATCC 9930, R. leguminosarum bv. viciae ATCC 10004 and. B. japonicum USDA 110, but decreased in R. fredii KR23, R. loti Lu7, and R. loti ATCC 33669 when soybean root exudation was added to the medium. The hexouronate ratio decreased except in R. loti Lu7. This result was consistent with the SDS-PAGE profile. The LPS-I region of R. loti LU7 showed little variation. It was therefore ascertained that soy-bean root secretion induces a variation in the structure of rhizobial lipopolysaccharides. |
本系統中英文摘要資訊取自各篇刊載內容。