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Relative Importance of Stem and Root Genotype in Determining Differences in Percent Protein and Oil of Soybean Seed¹

Reciprocal grafts were made among soybean genotypes varying in protein and oil percentage of the seed to determine the importance of root and stem in protein and oil accumulation. Results from two years indicate that the control sites for protein and oil synthesis are located in the aboveground portion of the plant. Differences in root genotype did not affect the protein and oil content of the seed.

Key Words: Glycine max (L.) Merrill • chemical composition • genetics • physiology

² Leader, Soybean Investigations, Crops Research Division, Agricultural Research Service, and Professor, Department of Genetics, North Carolina State University, (formerly Geneticist, Crops Research Division).

Received for publication April 27, 1968.

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