Manganese Uptake and Transport in Plants

Abstract

Manganese is the eleventh most common element in the earth’s crust, with an average concentration of total Mn of 900 mg kg-1 [1]. Soils known to cause Mn deficiency to susceptible crops are usually impov­ erished siliceous and calcareous sandy soils of neutral or alkaline pH that favor chemical and microbial oxidation and immobilization of plant-available Mn2+. However, even these soils contain large reserves of total Mn relative to those removed in crop harvests. Therefore, result­ ing Mn deficiency of susceptible crops is due to insufficient availability of soil Mn to plants rather than an absolute shortage of soil Mn. Dis­ cussion on soil biogeochemistry of Mn is beyond the scope of this chap­ ter; the reader is referred to other sources [2-5]. While Mn availability can range from deficiency to sufficiency to toxicity, this chapter will concentrate on uptake and translocation of Mn in deficient and suffi­ cient conditions. Various other aspects of Mn nutrition can be found elsewhere [6-9].

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