Fig. 4. Frequency distributions of days to heading in the F₂ populations from crosses of HS169 x Gimbozu (A), HS169 x ER (B), and HS169 x LR (C) under short (10 h) photoperiod. In the F₂ of HS169 x LR, plants with a genotype Pgi2-1Pgi2-1, Pgi2-1Pgi2-2, and Pgi2-2Pgi2-2 are indicated by black, white, and gray bars, respectively.

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