The Role of Manganese in Resistance to Plant Diseases

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Abstract

Plant nutrition, although frequently unrecognized, has always been an important component of disease control. The effects on disease of crop rotation, crop sequence, liming for pH adjustment, irrigation, and organic amendments such as manure are frequently through nutritional interactions as much as other factors. These practices supply nutrients directly, or render them more or less readily available for plant uptake through altered solubility or modified microbial activity. The effect of microbial activity and environment also may obscure the role of a specific element. The generally adequate availability of most nutrients for plant growth has induced an apathetic attitude toward the vital role of minerals in disease resistance. This is especially true for Mn which, although recognized as an essential element, has received most attention because of its potential toxicity.