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Interspecific Hybridization in Glycine, Subgenus Leptocyamus¹

Reciprocal hybrids between an induced autotetraploid form of Glycine tomentosa (Benth.) (n=20) and G. tabacina (Labill) Benth. (n=40) were obtained. All F₁ hybrids were morphologically intermediate between the parents and were highly male and female sterile as estimated by pollen stainability and seed set. However, F₁ hybrids with G. tomentosa cytoplasm had lower pollen stainability and the anthers usually failed to dehisce. F₁'s with G. tabacina cytoplasm shed pollen abundantly. F₂ and backcross plants generally were lower in fertility than the F₁'s. In all comparisons made between G. tomentosa and G. tabacina cytoplasms the former was associated with lower fertility. Both species are members of the subgenus Leptocyamus and limited attempts to cross them with G. max (of the sub-genus, Soja) were unsuccessful.

Cytological observations indicated three different genomes are involved in the two species crossed. G. tomentosa was designated 2(A₁) and G. tabacina 2(A₀A₂). Genome A₁ is apparently more closely related to both genome A₀ and A₂ than A₀ and A₂ are related to each other.

Key Words: interspecific hybrids • chromosomes • soybeans • male sterility

² USPHS Genetics Training Grant Fellow, Indiana University, Bloomington, Ind., and Professor of Plant Genetics, University of Illinois, Urbana, Illinois 61801.

Received for publication February 3, 1968.