Starch and Phytoglycogen Breakdown in the isa1 Mutant.
The isa1 mutant was grown in a 24°C/24°C, 24°C/16°C, or 24°C/12°C thermocycle and harvested at various times during the night to determine the level of phytoglycogen (A) and starch (B). The results are given as the mean ± sd (n = 4, each sample contains three individual plants). Black and white bars at the top indicate light and dark periods, respectively.