Chlorosis of orange leaves. Leaves from the orange plant (Citrus sinensis) that have turned pale green due to chlorosis. This is a condition where lack of chlorophyll (a green pigment found in leaves) causes a leaf to turn a pale green or yellow colour. The pigment chlorophyll is needed by plants to produce sugars by photosynthesis. In this case, the chlorosis was caused by deficiency of a trace mineral, the element magnesium.
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