What naturally present compound in lettuce, transported via xylem, can accumulate in older leaves and poses a risk of carcinogenesis or infantile methemoglobinemia if intake is excessive?
Answer
Nitrates
Nitrates are naturally occurring compounds found within lettuce, absorbed from the soil via the roots and transported upwards through the xylem tissue into the leaves. As a result of this physiological transport mechanism, older and larger leaves tend to accumulate higher concentrations of nitrates compared to younger foliage. While nitrates serve an essential function for the plant, excessive human consumption is a safety concern because, under certain conditions, ingested nitrates can potentially lead to serious health outcomes, including carcinogenesis or a condition known as infantile methemoglobinemia.
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