Gene expression of phenylpropanoid and flavonoid biosynthetic pathway Relative gene expression in the fourth leaf of red lettuce exposed to both ozone concentrations (100 and 200 ppb) showed an increasing trend with ozone exposure time ( Figures 4 , 5 ).
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Ozone control as a novel method to improve health-promoting bioactive compounds in red leaf lettuce (<i>Lactuca sativa</i> L.).
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The sentences
The expression of most genes in lettuce plants exposed to 100 and 200 ppb of ozone increased rapidly after 0.5 h and showed a decreasing trend after reaching a peak.