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Manganese toxicity in tomato plants effects on cation uptake and distribution



Manganese toxicity in tomato plants effects on cation uptake and distribution



Journal of Plant Nutrition 13(5): 513-526



Two experiments are described in which tomato plants (Lycopersicon esculentum L. var Ailsa Craig) were grown in water culture supplied with 10-300 .mu.M Mn. Toxicity symptoms associated with a yield reduction were observed only in treatments in excess of 50 .mu.M Mn indicating that this species is relatively tolerant of high Mn supply. Dark brown/black spots appeared first in the cotyledons. Similar symptoms were observed in the leaves, progressively from the oldest leaf. Manganese concentration in the shoot tissues ranged from 286 to 4240 .mu.g g-1 dry weight. The high Mn concentration values found in the shoot tissues of the toxic plants indicate athat Mn was highly mobile in the xylem as confirmed by xylem sap analysis. The concentrations of both Ca and Mg were lower in the smaller Mn toxic plants. Not only was uptake of Ca and Mg retarded but so also was the distribution of Ca and Mg to the younger tissues as illustrated by measurements of Ca and Mg concentrations along a leaf age sequence. This is in accord with the cation-anion balance of the xylem exudates collected from decapitated plants. Higher cation exchange capacity (CEC) was found in the leaf tissues of toxic plants particularly in the older leaves but similar values of C.E.C were recorded for the younger leaf tissues of both control and toxic plants.

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Accession: 007532803

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DOI: 10.1080/01904169009364096


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