The most well studied function in plant metabolism that is dependent on manganese is the water splitting reaction in photosystem two, which is the first step of photosynthesis. Manganese is also plays a role in nitrogen metabolism.
Manganese plays a role in photosynthesis by aiding in chlorophyll production.
Manganese influences the uptake and assimilation of other plant nutrients, and also affects metabolic energy by regulating carbohydrate metabolism.
Like copper manganese is an important factor for immobilization a free oxygen radicals.
Manganese regulates the splitting of water molecules during photosynthesis it also accelerates germination and early season seed development. Manganese activates several enzymes and increases the availability of phosphorus and calcium in aids in chlorophyll synthesis, also heightens the concentration of valuable ingredients such as citric acid and vitamin C in crops.
As an immobile nutrient manganese deficiency symptoms first appear on younger leaves, some of the symptoms of manganese deficiency include chlorosis on mature foliage followed by chlorosis on young foliage. Crops can become yellowish to olive green and foliage appears wilted and interventional chlorosis develops in the leaf sets.
High Soil PH above 7.0 can increase deficiency symptoms of manganese, as well as low levels of potassium can interfere with affective uptake in Soil and high levels of copper iron and zinc can negatively affect manganese uptake.