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低浓度2,4-D溶液作用于麦苗的不同部位,产生不同的生理效应。以1.5ppm的2,4-D溶液喷于麦苗茎、叶,对小麦生长有刺激作用,但根部不形成瘤状物;如以同样浓度的2,4-D溶液浇根,麦苗根部形成瘤状物,但麦苗植株生长受到抑制。用抗药性标记的田菁茎瘤菌(Azorhizobium caulinodans)接种,证明在30%左右的麦瘤中有该菌进入,但这种麦瘤测不出固氮酶活性,说明麦瘤中少量茎瘤菌是随机性的被动进入,也没有与小麦植株建立共生关系。
Low concentrations of 2,4-D solution in different parts of wheat seedlings, resulting in different physiological effects. 1.5ppm of 2,4-D solution sprayed on the stems and leaves of wheat seedlings, wheat growth stimulus, but the root does not form a tumor; such as the same concentration of 2,4-D solution pouring roots, malt root formation of tumor However, the growth of barley plants is inhibited. Inoculation with resistant marker Azorhizobium caulinodans showed that the bacteria entered into about 30% of the wheat tumors, but this kind of wheat tumor could not detect the activity of nitrogenase, indicating that a small amount of the tumorous bacteria Is a random access to passive, no symbiotic relationship with the establishment of wheat plants.