用2,4-D诱发非王科作物结瘤固氮,是近几年我国农业科技界又一引人瞩目的问题。本文以小麦为试验材料,观察到一定浓度的2,4-D虽能诱发小麦根部结瘤,但结瘤后的小麦植株生长受到明显抑制,用乙炔还原法测不出这些麦瘤具有固氮活性。以抗药性标记的根瘤菌进行追踪试验,证明根瘤菌在麦瘤中出现机率仅为30%左右,有半数以上的麦瘤不含根瘤菌。试验再次表明小麦“根瘤”实际上是2,4-D直接引起的对作物本身有害无益的病态变异,而不是共生的固氮根瘤。 Using 2,4-D to induce nodulation and nitrogen fixation in non-wondrous crops is yet another remarkable issue in China’s agricultural science and technology sector in recent years. In this paper, wheat was used as the experimental material. Although a certain concentration of 2,4-D could induce the root nodulation of wheat roots, the growth of the wheat plants after the nodulation was significantly inhibited, and the acetylene reduction method could not detect the nitrogen-fixing activity of these wheat germs . Rhizobium with drug-resistant markers for follow-up tests showed that Rhizobium in the presence of only about 30% chance of malformations, more than half of the tumor does not contain Rhizobium. The test again shows that the “nodule” of wheat is actually a pathological mutation that is directly harmful to the crop caused by 2,4-D rather than a symbiotic nitrogen fixing nodule.