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Response or ‘Chippewa 64’ Soybean Scions to Roots of Different Genotypes¹

The objective of this study was to determine if the root system is a limiting factor in the productivity of soybeans [Glycine max (L.) Merr.]. The effect of soybean root genotypes on agronomic characteristics of ‘Chippewa 64’ scions was determined by hypocotyl grafts. The scion was dominant in determining seed weight, oil, protein, and maturity, while the root altered lodging, height, and seed yield. Most rootstocks increased lodging and reduced height and seed yield of grafted Chippewa 64 scions. Grafted and ungrafted Chippewa 64 plants were not significantly different in height, lodging, seed weight, oil, protein, maturity, or yield.

Key Words: Glycine max • Root-scion grafts • Rootstocks

² Assistant Professors of Agronomy and Plant Genetics.

Received for publication August 24, 1971.