Abstract
Dwarfing and sensitivity to the duration of a single inductive dark period for flowering ofPharbitis nil in F2 progeny of a cross between the tall strain Tendan, and the dwarf, Kidachi appear to be controlled by the alleles at two independent loci. Progeny of a similar cross between the tall strain Violet and the dwarf Kidachi at F2 and F3 also showed single locus segregation for tall: dwarf plants. In this cross, differences in photoperiodic response could be identified in F3 families but they were not simply inherited. There was some evidence of difficulties with classification of the F2 plants, but also, the flowering of the F1 between the two less sensitive strains Tendan and Violet indicated complex inheritance of their photoperiodic response. Complementary dominant alleles at three independent loci may be necessary for flowering in even shorter dark periods with the sensitive strain Kidachi.
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