Genetic Notes on Hybrids of Perennial Teosinte and Maize

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Abstract
Notes on the genetics of certain hybrids of Euchlena perennis with Zea mays are reported as an aid in interpreting the cytology of such hybrids. The allelomorphs considered were Aa, BBwb, Cc, Rr, Gg, Wxwx, Susu, Tutu, Yy, and Lglg. The genotypes involved linked genes in 3 of the known linkage groups in maize. By choice of the proper genetic material it was possible to detect the distribution of maize chromosomes in the F1 hybrids and the absence of teosinte homologs when back-crosses were made with maize. The somatic cells of the F1 hybrid were assumed to contain 30 chromosomes, 20 of which were contributed by the teosinte parent and 10 by the maize parent. The F1 plants were only partly fertile, 5 to 10% of the pistillate flowers setting seed when pollinated with maize pollen. The genetic evidence indicated that the disjunction and assortment of any 3 homologous chromosomes in F1 hybrids at the reduction division is not wholly at random, but that the 2 teosinte chromosomes more commonly disjoin and pass one to either pole, while the maize chromosome is distributed at random. The absence of teosinte homologs was demonstrated in about 7% of the back-cross progeny as compared with 16.7% which would be expected with purely random disjunction and assortment of trisomic groups in the formation of 9 gametes by the F1 hybrid.

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