Arsenic Soil Contamination and Its Effects on 5-Methylcytosine Levels in Onions and Arsenic Distribution and Speciation.

Chlorophylls content ( Table 2 ) did not show a clear trend, but the lowest values were found in the 10 ppm variant, which correlates with the microscopy observation results ( Figure 2 ) where the 10 ppm variant was the most affected. 3.3.

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Changes in 5-Methylcytosine Level under Arsenic Exposure Figure 3 shows that the 5-methylcytosine levels and arsenic content in the roots of the contaminated variants, where 5-methylcytosine levels had an increasing trend, pointed to DNA hypermethylation caused by high arsenic levels induced by stress.

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