The Timing of Exogenous 2,4-Dichlorophenoxyacetate (2,4-D) Application Affects Nodulation of Soybeans, Glycine max (L.) Merr.

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The effects of exogenous addition of 2.26 μM 2,4-dichlorophenoxyacetate (2,4-D) at the time of sowing and 3 d after on nodulation and nodule function were investigated in soybean [Glycine max (L.) Merr.] cvs. "Enrei," "Lee," and "Nanbushirome." Both treatments especially that at the time of sowing considerably depressed shoot and rot development. The total number of cortical cell division foci/cm lateral root was similarly increased 2-8 fold by the treatments but the increase in the number of nodules/cm lateral root in plants treated 3 d after sowing was generally twice that of the treatment at the time of sowing. Majority of the cortical cell divisions, notably in treated plants, was arrested in plants treated 3 d after sowing but was decreased by the earlier treatment. Nevertheless, treated plants showed a similar nitrogenase (acetylene reduction) activity on a plant basis, and the specific nodule activity was highly variable indicating that nodule activity is independent of both nodule number and weight. The possible role of 2,4-D in nodulation is discussed.
社団法人日本土壌肥料学会の論文