What are the effects of manganese toxicity in plants?

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Solution

Manganese toxicity symptom is appearance of brown spots surrounded by chlorotic veins. It is seen that Mn competes with iron and magnesium for uptake. Also is a competitor to magnesium for binding to enzymes. Mn also inhibits Ca translocation in shoot apex. Hence, Mn excess causes deficiency of Mg, Fe and Ca.

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Manganese toxicity results in deficiency of iron, magnesium and calcium because:

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