Figure 1.

Pigment content of cotyledons from SM and gh tomato lines. Seedlings were grown in darkness for 4 and 6 d after seed imbibition to obtain white (A) and pale yellow (B) cotyledons (T0 time point), respectively. Seedlings were then transferred to either low light (20 μmol m⁻² s⁻¹ PAR) or to a higher light intensity (200 μmol m⁻² s⁻¹ PAR). Samples were analyzed after 24 h of light for white cotyledons and after 6 h of light for yellow cotyledons. Eight cotyledons were pooled for a given measurement. Each measurement was repeated three times with a different pool of cotyledons. ses of the mean values were below 12% (data not shown). Whether changes are statistically significant is discussed in the “Results” section. PAR, Photosynthetically active radiation.