Mineral nutrient composition of Brassica pekinensis L. as affected by plant sulfur status
semanticscholar(2015)
摘要
Sulfur deficiency in plants has severe impacts on both growth and nutrient composition. Fumigation with sub-lethal concentrations of H2S facilitates the supply of reduced sulfur via the leaves while sulfate is depleted from the roots. This restores growth while sulfate levels in the plant tissue remain low. In the present study this system was used to reveal interactions of sulfur with other nutrients in the plant and to ascertain whether these changes are due to the absence or presence of sulfate or rather to changes in growth. There was a complex reaction of the mineral composition to sulfur deficiency, however the changes in content of many nutrients were prevented by H2S fumigation. These nutrients were strongly correlated with changes in growth and less correlated with the content of sulfur in the plant tissue. Under sulfur deficiency these nutrients accumulated on a fresh weight basis but were diluted on a dry weight basis, due to a higher dry matter content. The pattern differed, however, between leaves and roots which led to changes in shoot to root partitioning. Only potassium, molybdenum and zinc were found to be largely independent of changes in growth and instead strongly correlated with sulfur content. Potassium was the only nutrient amongst those measured which showed a positive correlation with sulfur content in shoots, highlighting a role as a counter cation for sulfate during xylem loading and vacuolar storage in leaves. This was supported by an accumulation of potassium in roots of the sulfur-deprived plants. Molybdenum and zinc increased substantially under sulfur deficiency. While these causes of increased molybdenum under sulfur deficiency have been previously studied, the relation between sulfate and zinc uptake needs further clarification.
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