位于伊利诺斯州厄巴纳的植物生理研究所的美国科学家James E.Harper领导的研究小组已鉴别出控制大豆根瘤过量形成的单基因。他们正试图在染色体上定位该基因并设法培育出具有过量根瘤性状又高产的大豆品种。研究发现控制大豆根瘤形成的化学信号来自植株生 A team led by James E. Harper, a U.S. scientist at Plant Physiology Institute in Urbana, Illinois, has identified a single gene that controls overgrowth of soybean nodules. They are trying to locate the gene on chromosomes and try to breed soya varieties that have excessive amounts of nodules and high yields. The study found that the chemical signals that control the formation of soybean nodules come from the plant