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Inheritance of a Seedling Marker in Agropyron repens¹

Almost all seedlings of Agropyron repens (L.) Beauv. contain anthocyanin pigments, but a few are pure green. Pure green plants breed true far that trait when selfed or crossed with other green plants, and the green character is recessive. Six heterozygous colored A. repens clones segregated for colored vs green seedlings in ratios approximately 3:1, 15:1, or 63:l when selfed. Segregation in F₂ and testcross progenies of the colored clones was consistent with the hypothesis that seedling coloration is controlled by triplicate dominant factors. Each of the three A. repens genomes apparently contains a locus controlling pigment formation, and the presence of any one of three dominant genes leads to seedling coloration. Plants homozygous for the green character should prove to be valuable genetic stocks. Their use as female parents permits early and accurate separation of selfs from hybrids in unemasculated crosses.

Key Words: Anthocyanin pigments • Triplicate factors • Disomic inheritance • Genetics • Quackgrass

² Research Geneticist, PSRD, ARS, USDA. Logan, Utah 84321.

Received for publication January 28, 1972.