Figure 2.

Phenotypic analysis of alb3 alb4 double-mutant plants. A, Albino seedlings derived from the segregating progeny of alb3/+ or alb3/+ alb4/alb4 plants grown in vitro on Murashige and Skoog (MS) medium supplemented with 0.5% (w/v) Suc were transferred to MS medium containing 3% (w/v) Suc 2 weeks after germination (top) and allowed to grow for an additional 1 week (bottom). B, Chlorophyll a (Chl a) and Chl b were measured in ng mg⁻¹ fresh weight using 3-week-old seedlings grown in vitro as described above. The ratio of chlorophyll a to chlorophyll b (Chl a/b) is larger than 1 for alb3 but smaller than 1 for alb3 alb4. C, Total carotenoid (Car) content was measured in ng mg⁻¹ fresh weight using similarly grown 3-week-old seedlings. All error bars denote se (n = 3).