Figure 6.

Blocking of greening by FR in Arabidopsis. Seedlings expressing Δ6-12 phyA are paler than the WT after hourly FR and greener than the WT after continuous FR. One-day-old seedlings of the WT, or expressing either FL or Δ6-12 oat phyA, were exposed for 3 d to continuous FR or hourly pulses of FR and subsequently transferred to fluorescent white light (100 μmol m⁻² s⁻¹) for 24 h to allow greening. Bars corresponding to stronger expression (Fig. 2A) are placed to the left and those corresponding to weaker expression (3% of strong expression lines) are placed to the right. A, Chlorophyll levels. B, VLFR (difference between darkness and hourly FR) and HIR (difference between hourly and continuous FR). Data are means and se of 10 replicate boxes.