论文部分内容阅读
生物固氮(BNF)并不是新的东西。大约在一个世纪以前就有人证明豆类植物根瘤可以固氮。最近研究,无可置疑的事实说明BNF给农民带来了巨大的利益。生物固氮就是有机体将大气中的氮气转化为植物可以利用的氮素化合物。BNF被分为共生型:两种或更多种固氮有机体共生互惠;非共生型:单独生活的固氮有机体。豆类植物根瘤菌共生大概是最有名的BNF形式。根瘤菌渗入豆类植物的根毛形成根瘤。它在根瘤中继续生活但却丧失了繁殖力。这些不繁殖的根瘤细菌或假菌体会一直生存到植物开始结籽——长达120天。豆类
Biological nitrogen fixation (BNF) is not new. About a century ago it was demonstrated that legume nodules can fix nitrogen. Recent research, no doubt about the fact that BNF has brought huge benefits to farmers. Biological nitrogen fixation is the organism will nitrogen in the atmosphere into nitrogen compounds can be used by plants. BNF is divided into symbiotic: two or more kinds of nitrogen fixation organisms symbiotic mutualism; non-symbiotic: nitrogen-fixing organisms living alone. Legumes Rhizobium symbiosis is probably the most famous form of BNF. Rhizobium infiltrates the roots of legumes to form nodules. It lives in nodules but loses its fertility. These non-breeding nodules or pseudotubes survive until the plants begin to seed - up to 120 days. Beans