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Variation in Seed Protein among Nodes of Determinate and Indeterminate Soybean Near-Isolines

Universidad de los Andes, Nucleo Universitario Rafael Rangel Departmento de Ciencias Agrarias El Prado, Trujillo, Estado Trujillo, Venezuela
USDA-ARS, Crop Production and Pathology Res. and Dep. of Agron., Purdue Univ., W. Lafayette, IN 47907

^* Corresponding author.

Soybean, Glycinc max (L.) Merr., seed protein differs considerably among seeds from different nodes of indeterminate plants. Determinate soybean plants grown in the northern USA have fewer nodes, shorter flowering periods, but similar reproductive periods compared to indeterminate plants. The objective of this study was to determine nodal variability in seed protein of determinate vs. indeterminate soybean near-isolines. Ten pairs of near-isolines from four soybean crosses were included in a 2-yr study at West Lafayette, IN. Protein content was evaluated for seeds from individual fruiting nodes on three plants from the ten determinate and indeterminate near-isolines each year. Seed protein increased linearly from 397 at Node 5 to 442 g kg^–1 seed weight at Node 11 on determinate plants. On indeterminate plants, seed protein increased from 398 at Node 6 to 441 g kg^–1 at Node 14. Protein contents of seeds from Nodes 12 through 16 of indeterminate plants were all high but values did not differ significantly among these upper nodes. The greatest range in protein among all nodes from three plants of an individual line was from 349 to 510 g kg^–1 for indeterminate and from 34 to 487 g kg^–1 for determinate plants. The data demonstrate that accurate protein determinations for determinate, as well as indeterminate soybean plants, requires adequate sampling to represent the nodal variability occurring in both plant types.

Received for publication February 1, 1993.

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