Inheritance of Pod Type, Stem Color, and Dwarf Growth Habit in Medicago polymorpha
- R. L. Haan and
- D. K. Barnes
Identification of marker traits in annual Medicago species (medics) would assist plant breeders in cultivar development. The objective of this research was to determine the inheritance of pod type, stem color, and dwarf growth habit in Medicago polymorpha L., a diploid species. Progeny from each of three crosses were evaluated in the F1, F2, and F3 generations. Results indicate that pod type was controlled by a single gene with a dominant allele for spiny pods. We propose the gene symbol Sp1 for the pod type trait. Stem color also was controlled by a single gene, with a dominant allele for red stems. We propose Rs1 as the gene symbol for this trait. The dwarf trait was not present in the parents or the F1 generation, but was observed in the F2 generation of one of the crosses. Dwarf plants had much shorter stems, internodes, and leaf petioles than normal plants, and they also had smaller, puckered leaves. The trait appeared to be controlled by two genes with partial recessive epistasis. We propose the gene symbols Dwl and Dw2 for this trait. Results indicated that the genes for pod type and stem color segregated independently and were not linked.
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