Symptoms of manganese (Mn) toxicity appear first on the oldest leaf of a plant and progresses to the younger leaves. Symptoms can vary from variety to variety and include chlorosis with little necrosis, chlorosis progressing to necrosis, and in some cases reddening combined with necrosis and chlorosis. Waterlogging results in high shoot concentrations of iron (Fe), aluminum (Al), and manganese (Mn) and in wheat grown in acidic soil. This set of materials contains of range of reaction types, as may be viewed in the Source file.

Source: CIMMYT Wheat Germplasm Bank