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Carbon-14 Assimilate Translocation in Nodulated and Nonnodulated Soybeans¹

Nodulating and nonnodulating soybean [Glyclne max (L.) Merr.] isolines were grown for 30 days in silica sand in the greenhouse with 0, 50, and 100 µg N/g sand to evaluate ¹⁴C translocation in plants dependent solely on N fixation or nitrate uptake or both.

No differences were observed between the two geno. type's translocation patterns at the vegetative stage, when they are totally dependent on soil nitrate up to 120 hours after ¹⁴CO₂ exposure.

Plant leaves, totally dependent on symbiotically fixed N, exported 14% more ¹⁴C to the roots and nodules when compared to plants with total inhibition of nodulation. No more than 2% of the total recovered ¹⁴C was found in the nodule component at any harvest time.

Plants with partial inhibition of nodulation (grown with 50 µg N/g sand) exhibited relatively intermediate characteristics. The stem component contained significantly less ¹⁴C than the other treatments and was accompanied by a decrease in stem dry weight.

Key Words: Radioisotopes • ¹⁴CO₂ labelling • Glycine max (L.) Merr.

² Instructor (now post-doctoral research associate) and assistant professor of agronomy, respectively, University of Missouri-Columbia.

Received for publication May 28, 1974.