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A method for Production of Experimental Quantities of Hybrid Soybean Seed

The production of F₁ seeds is difficult in soybeans [Glycine max (L.) Merr.]. Hand pollinations are tedious and time consuming, and each successful pollination only produces one, two, or three seeds. A method is suggested herein for producing experimental quantities of hybrid soybean seeds by the use of two traits, genetic male sterility (ms₁ms₁ or ms₂ms₂) and green seed embryo (d₁d₁d₂d₂). The green seed embryo shows through a yellow seed coat to give the soybean seed a green phenotype that can be easily recognized. Male-sterile maintainer lines marked with green seed embryos would be used as female parents. The male parent could be any cultivar (or strain) that has a yellow seed embryo (D,_1-, D_2-, or both) and that flowers synchronously with the female parent. Cross-pollination would be effected by insect vectors in blocks where the male and female lines were inter planted. Yellow seeds harvested from green-seeded, male-sterile plants would mark F₁ hybrid seeds.

Key Words: Glycine max (L.) Merr. • Male sterility • Green seed embryo

Received for publication March 8, 1982.