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Monosomic Analysis of Photoperiod Response in Wheat¹

Identification of specific chromosomes containing the genes for photoperiod response in common wheat (Tritlcure aestivum L. era. Thell.) was undertaken. F₁ and F₂ progenies from crosses of a photoperiod insensitive spring wheat (‘Sonora 64’) with 21 diferent monosomic lines of a sensitive winter wheat (‘Cheyenne’) were grown with the parental cultlvars under a 10-hour photoperlod. A disomic F₂ population was used to measure the standard segregation pattern.

The vernalized winter parent was still in the vegetative state after 152 days under a 10-hour photoperiod. The spring parent headed, on an average, 54 days after planting. The F₁ population headed, on an average, 66 days after planting. Disomlc F₂ population segregation under a 10-hour photoperiod indicated that three gene pairs, with dominant epistasis for earliness of one of the factors, controlled this character. Heading response of the F₂ progenies of the monosomic line for chromosome 2D showed that this chromosome is the carrier of the Ppd 1 gene with the dominant epistatic effect. Two of the four chromosomes 2B, 4B, 3D, and 6D are possible carriers of the other two genes.

Key Words: Triticum aestivum L. em Thell. • Dominant epistasis • Heading date • F₂ distribution patterns

² Former graduate research assistant and professor, respectively, Agron. Dep., Colo. State Univ., Fort Collins, CO 80523.

Received for publication November 18, 1974.