紫云英是一种豆科高产绿肥植物,在国内种植面积大,分布广,目前已由长江两岸南移遍及华南地区,北移跨过淮河秦岭,是我国粮棉田的好肥源。实践证明,接种有效紫云英根瘤菌不仅是新区发展紫云英成败的关键,也是提高老区鲜草产量的重要技术措施之一。而有效共生固氮关系的建立又取决于根瘤中是否同时具备有两个特有的蛋白—豆血红蛋白和固氮酶。已有研究表明,几种豆科植物根瘤的脱氢酶和氨基转移酶有较高的 Astragalus is a leguminous plant with high yield of green manure. It has a large planting area and wide distribution in the country. It has now moved southward across the Yangtze River and southern China across the Qinling Mountains of the Huai River. It is a good source of grain and cotton in China. Practice has proved that inoculation effective Ziyun Ying rhizobium is not only the key to the success of the development of Astragalus New Area, but also to improve the production of fresh grass in the old one of the important technical measures. The establishment of effective symbiotic nitrogen fixation depends on whether nodules also have two unique proteins - hemoglobin and nitrogenase. Studies have shown that several legume nodules have higher levels of dehydrogenase and aminotransferase