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硝酸还原酶活性和根瘤固氮活性之间没有直接关系。The NRA was not directly correlated with nitrogenase activity.

用乙烯为探针研究了固氮酶中N2的键合位。Ethylene was used as a probe to detect the N2-binding site in nitrogenase.

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钼是豆科作物固氮酶复合体组成的必需元素。Molybdenum is an essential element consisting of nitrogenase enzyme complex.

经固氮酶活性测定，PA19、PA2和PK1菌株具有较强的固氮酶活性。The results showed that PA19, PA2 and PK1 strains had high nitrogenase activities.

随着根瘤和其中类菌体的发育，根瘤固氮活性逐渐上升。In the senescence stage of nodule, the bacteroidsautolyzed and nitrogenase activity disappeared.

水稻的光合作用及报分泌能力影响根际固氮活性。The photosynthetic rate and excretory ability affected the nitrogenase activity in the rhizosphere.

为了模拟生物固氮，对固氮酶进行了一系列的研究。In order to simulated biological nitrogen fixation, a series of studies on nitrogenase are proceeded.

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具有较强分泌能力的植株，其根际固氮活性也较高。The higher the nitrogenase activity in the rhizosphere of rice the greater the amount of root exudates.

土壤水分过多或缺乏，都导致固氮活性极大降低。Deficiency or excess of water in the soil could cause the tremendous decline of the nitrogenase activity.

酶活的高低与藻蓝素含量和光照强度成反相关。The level of nitrogenase activity was correlated reciprocally with the content of cell phycocyanin and the light intensity.

此外，甘蔗根、茎、叶中固氮菌的固氮酶活性之间关系较为密切，根中固氮菌的固氮酶活性与叶片和茎中的都呈负相关。There was a negative correlation between the nitrogenase activities of nitrogen fixing bacteria in root and that in leaf and stem.

联合固氮体系的建立是联合固氮菌发挥高效生物固氮活性的关键要素之一。Stable and high efficiency micro-plant interaction is essential to the optimal nitrogenase activity of root-associated nitrogen fixation bacteria.

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供试菌随寄主植物的改变，侵染能力及所建立的共生系统固氮活性有所降低。If the original host plant was replaced by others, both these Frankia' infective ability and nitrogenase activity in new symbiotic system were lower.

单因素效应对固氮酶活性的影响高于因素间的作用，菌株与品种两因素间的交互作用大于其它交互作用。The effect of single factor on nitrogenase activity was larger than that of factors, the interaction of strains and varieties was larger than that of others.

黄熟期测定的菌数和固氮酶活性都比灌浆期测定的低，而且土壤中也可检测到少量固氮菌和固氮酶活性。The number of nitrogen fixing bacterial counts and nitrogenase activities at the yellow maturity stage of the crop was much less than that of the milking stage.

经试验证明，大豆施肥有利于根瘤的形成和生长，并能提高根瘤固氮酶的活性和根瘤的固氮量。The results of experiments showed that fertilization could promote nodule formation and increase nitrogenase activity and the amounts of N_2-fixed by root nodules.

但生育前期低浓度硝酸盐对长农4号根瘤固氮酶活性有明显的抑制作用，酚脲含量减少。On the contrary, when low nitrate concentration was applied to Changnong 4, its nodule nitrogenase activity was inhibited and ureide content decreased in early growth period.

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结果表明，处理R1V2S2和R1V1S1的固氮酶活性最高，二者都极显著高于两种阴性处理CK。The results indicated that treatment R1V2S2 and R1V1S1 had the highest nitrogenase activities, which were significantly higher than those of the two corresponding CK, respectively.

低浓度硝酸盐在生育前期对吉林20号根瘤固氮酶活性有促进作用，酰脲含量增加，在生育后期有抑制作用。If low nitrate concentration was applied to Jilin 20, its nodule nitrogenase activity and ureide content were increased in early growth period, but were inhibited in later growth period.

特异固氮酶活性，品种间差异不显著，小粒种略高于大粒种，全生育期固氮酶活性出现两次高峰，与单株根瘤量的增长相一致。The mean nodule weight of large-seed variety per plant was obviously higher than that of small-seed variety. There was no significant difference in nitrogenase activity among 6 varieties.