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In an earlier study, two genes controlled flowering time in certain lettuce crosses. Early alleles (Ef-1, Ef-2) at both loci are partially dominant; flowering time in the greenhouse ranges about 100 days from double dominant to double recessive. Crosses between C-2-1-1, a double recessive line, and four cultivars were analyzed to study further the distribution of these genes. Empire and Salinas flower at the same time as C-2-1-1, while Vanguard 75 and Prizehead are earlier than C-2-1-1. Empire × C-2-1-1 and Salinas × C-2-1-1 showed unimodal distribution in F2, indicating segregation of several genes or environmental variation. A linear relationship between F2 plant values and F3 family means from both crosses suggested a polygenic basis. The F2 distribution of Prizehead × C-2-1-1 was similar but showed a greater range of flowering times. An additional major gene was indicated in Vanguard 75 × C-2-1-1, with earliness recessive.

280 GENETICS OF FLOWERING TIME IN LETTUCE: CROSSES WITH C-2-1-1, HOMOZYGOUS FOR LATE FLOWER TIME