Plant and Soil

, Volume 368, Issue 1–2, pp 73–85 | Cite as

The role of magnesium in plant disease

Regular Article

Abstract

Background

Magnesium (Mg), as an essential mineral element for plants and microbes, can have both indirect as well as direct effects on disease. Balanced nutrition is critical for the expression of disease resistance since nutrition is part of a delicately balanced interdependent system influenced by the plant’s genetics and the environment. A deficiency or excess of Mg can influence a wide range of physiologic functions because of these interrelated processes.

Scope

There are fewer reports of direct effects of Mg deficiency or excess on plant disease than for many elements because of its participation in a wide spectrum of general physiological functions so that individual activities involved in defense, virulence, or pathogenesis are not as easily characterized. The ability of Mg to compliment or antagonize other minerals can result in different disease responses to Mg under varying environmental conditions. Fusarium wilt pathogens tend to be less severe when adequate Mg is available, and Mg increases resistance of tissues to degradation by some pectolytic enzymes of macerating or soft rotting pathogens. In contrast, high rates of Mg that interfere with Ca uptake may increase the incidence of diseases such as bacterial spot of tomato and pepper or peanut pod rot.

Conclusions

The more general physiological benefits of Mg for active growth often obscure specific mechanisms involved in resistance to disease, although Mg is an important contributor to over-all plant health. A specific mechanism of defense to diseases enhanced by Mg includes increased resistance of tissues to degradation by pectolytic enzymes of bacterial soft rotting pathogens. Management of Mg nutrition to reduce disease, in balance with other minerals, is an underutilized tool for disease control.

Keywords

Magnesium Disease Pathogens Pathogenesis Disease resistance 

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© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Purdue UniversityWest LafayetteUSA
  2. 2.University of Florida, IFASGainesvilleUSA

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