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Inheritance of a Seedling Marker in Tetraploid Crested Wheatgrass¹

The first documented genetic seedling marker in tetraploid crested wheatgrass, Agropyron desertorum (Fisch. ex Link) Schult., is described. The recessive marker, designated as "green seedling" and represented by the gene symbol "g", is recognized by the absence of anthocyanin pigments in newly emerged seedlings. Expression of pigmentation in colored seedlings is apparently enhanced by light and favored by cool temperatures. Segregation in self and testcross progenies indicated that the character is controlled by a single tetrasomically inherited gene. Genetic stocks of each of the five possibe tetrasomic genotypes were isolated. Although chromosome segregation was assumed throughout, some chromatic! segregation occurred as evidenced by several cases of "double reduction". The value of this seedling marker to crested wheatgrass breeders and geneticists was discussed, and several examples of its use were cited.

Key Words: Agropyron Desertorum • Tetrasomic Inheritance • Anthocyanins • Genetics • Double Reduction

² Research Geneticist, Crops Research Division, ARS. USDA.

Received for publication March 25, 1968.