Zeaxanthin Epoxidation Inhibition by EPTC (S-Ethyl Dipropylthiocarbamate)
Abstract
Wheat (Triticum aestivum L. `Holley') was grown at three light levels (270, 20, and 0 μEinsteins/m2/s) in sand in which EPTC (0, 15.6, 31.25, 62.5, or 125.0 μg/kg sand) was incorporated. The EPTC-mediated height and fresh-weight decreases were light dependent. As EPTC concentration increased, CHL and total CAR contents (μg/g fresh wt) increased under 270 μEinsteins/m2/s, while CHL a:b, CHL b:CAR, and CHL a + b:CAR ratios decreased. Under 270 but not at 20 μEinsteins/m2/s, the quantities of β-carotene, lutein-epoxide, lutein, violaxanthin, antheraxanthin, and zeaxanthin decreased per milligram CHL b as EPTC concentration increased. Under 270 μEinsteins/m2/s, violaxanthin content (μg/g fresh wt) was not altered by EPTC treatment, but antheraxanthin and zeaxanthin contents increased, resulting in decreases in the ratio of epoxidized/de-epoxidized components of the violaxanthin cycle.
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