Figure 1

Male unreduced gamete production in two B. carinata lines (C1 and C2), one B. juncea line (J1), two B. napus cultivars (N1 and N2) and in the interspecific hybrids between them at four different temperatures. Unreduced gamete production was assessed by counts of dyads and giant sporads at the sporad stage of pollen development. Temperature treatments were (day 12 h/night 12 h) as follows: hot: 30°C/20°C, warm: 25°C/15°C, cool: 18°C/13°C, cold: 10°C/5°C. Data are given as group averages with ± one standard error bars. J1C1 and C1 plants under the "warm" growth condition died before flowering, and these missing values are indicated by an "x" on the x-axis. * Indicates significant difference (p < 0.001) between that temperature treatment and other temperature treatments for that genotype.