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Abstract

An improved procedure for forming F.sub.1 hybrid soybean plants (i.e., hybrid soybean plants of the first filial generation) is provided which is capable of being readily implemented on a commercial scale. Unlike processes proposed in the prior art the requisite cross-pollination needed to produce the F.sub.1 hybrid having hybrid vigor is precisely controlled. The seed parent upon which seeds capable of forming F.sub.1 hybrid plants are produced is fully male sterile (as described herein) thereby eliminating the possibility of self-pollination. It surprisingly has been found that the required male sterility is made possible in the seed parent by combining via a controlled plant breeding program previously widely dispersed factors comprising an atypical Cms cytoplasm and two distinct pairs of recessive genes for fertility restoration r.sub.1 r.sub.1 and r.sub.2 r.sub.2. For instance, the Cms cytoplasm conveniently may be derived from a Mandarin cytoplasmic source (e.g., the Elf variety), the r.sub.1 r.sub.1 recessive genes conveniently may be derived from a Dunfield germplasm base (e.g. the Bedford variety), and the r.sub.2 r.sub.2 recessive genes conveniently may be derived from a Tokyo germplasm base (e.g., the Braxton variety).

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