Figure 6.

Flowering time of plants with altered GA levels or response. Flowering time was recorded as the day the first flower fully opened and the petals were completely reflexed. Plants were grown under SD conditions to maximize the differences in flowering time. a through c show data from three separate experiments. Treatment of WT plants with GA was as described for Figure 5. Homozygous ga1 plants did not flower during these experiments, each of which lasted over 5 months. Combining ga1 with spy mutations or with 35S:SPY allowed flowering, as did treatment with GA (data not shown).