Figure 1.

Phenotypic variation for bolting time in the F₂ population. Box plots indicate the first and third quartile range of the phenotypic variation for each genotype. The top and bottom whiskers indicate the maximum data value. (A) F₂ plants (seed code 142063) and annual (001684, 991971) and biennial (056822, 133703, 930176) controls were grown in a climate chamber under long day conditions (16 h light/8 h dark) at 20 °C. After 135 days, non-bolting plants were kept for 12 weeks at 4 °C. For plants which did not start to bolt until the end of the experiment (grey dotted line), days to bolting was set at 325. The respective genotypes for BTC1 (B) and BvBBX19 (B2) are given according to Höft et al.⁹. Seed code 056822 and 133703 are the parental genotypes (bold letters). (B) Three F₂ plants with their respective genotypes after 12 weeks of cold treatment.