The Mobility of Manganese in the Wheat Plant

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Abstract
The distribution of manganese in wheat plants grown in solution culture has been studied. Manganese supply from the medium was so arranged that early leaves received sufficient for normal function but subsequent growth was severely restricted by deficiency of the element. Under these conditions little or no redistribution within the plant was observed, so that the early leaves retained most or all of their manganese, and remained healthy. When manganese was applied externally to the second leaves of deficient plants a small but significant amount was translocated to the growing points. The effect was slightly enhanced by repeated rewetting of the treated leaves, but the amount moved was still small in relation to that applied and to the requirement of the plants. It appears that manganese is not readily transported by the phloem under these conditions, but this does not wholly account for the ability of some leaves to retain critical levels when a state of deficiency exists at the growing points. Possible mechanisms for this effect are discussed.

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