日本根瘤菌的胞外多糖组成、离体固氮酶活性及DNA同源性
Extracellular polysaccharide composition, ex planta nitrogenase activity, and DNA homology in Rhizobium japonicum.
作者信息
Huber T A, Agarwal A K, Keister D L
出版信息
J Bacteriol. 1984 Jun;158(3):1168-71. doi: 10.1128/jb.158.3.1168-1171.1984.
Abstract
The composition of the major acidic extracellular polysaccharide (EPS) of 25 strains of Rhizobium japonicum was determined. Eight strains synthesized an acidic EPS containing rhamnose and 4-O- methylglucuronic acid and were closely related according to DNA homology. These same strains also expressed high levels of ex planta nitrogenase activity. Sixteen strains produced an acidic EPS containing glucose, mannose, galacturonic acid, and galactose and were also related by DNA homology. These strains developed little or no nitrogenase activity under the experimental conditions employed.
摘要
测定了25株日本根瘤菌主要酸性胞外多糖（EPS）的组成。8株菌合成了一种含有鼠李糖和4-O-甲基葡萄糖醛酸的酸性EPS，根据DNA同源性，它们密切相关。这些菌株在体外也表现出高水平的固氮酶活性。16株菌产生了一种含有葡萄糖、甘露糖、半乳糖醛酸和半乳糖的酸性EPS，同样根据DNA同源性相关。在所用的实验条件下，这些菌株几乎没有或没有固氮酶活性。
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