Figure 2.

The fluctuation of free and soluble conjugated PAs (Put, Spd, and Spm) in developing zygotic embryos of Scots pine. Immature embryos were collected four times in 2001 and 2003 throughout the period of embryo development from two Scots pine clones, K818 and K884. The free and soluble conjugated PA concentrations are presented relative to the effective temperature sum (d.d.) and the year (• = 2003, ○ = 2001). The mean values of the four replicates pertaining to the same clone, year, and sampling date are connected by solid lines for 2003 and dashed lines for 2001.