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- W2034774269 abstract "The growth and inorganic ion composition of K-sufficient lettuce shoots were measured after withholding K or K and Na from transplanting in sand culture experiments in the glasshouse. Initial reductions in shoot growth occurred shortly after transplanting in both K-deficient treatments when the K concentrations were still well above that known to limit enzymic activity. These early growth effects coincided with a rapid decline in total ionic strength within the plants caused by the fall in K concentration which could not be compensated for by increases in the uptake of Na, Mg or Ca, even when adequate concentrations of all of these ions were available. Further rapid reductions in growth rate occurred when the concentration of K declined below about 600 mmol kg−1 in both K-deficient treatments. These results support the hypothesis of a dual mechanism for the effect of K concentration on growth during K deficiency. The primary effect was caused by a rapid decline in ionic concentration shortly after the K became unavailable which severely affected the mechanisms controlling turgor pressure within the plant. The secondary effect was caused by a reduction in enzymic activity and only became important when the K status of the plant was relatively low." @default.
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- W2034774269 date "1986-02-01" @default.
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- W2034774269 title "Cation replacement of potassium in the total shoot of lettuce and its effect on growth during K deficiency" @default.
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- W2034774269 doi "https://doi.org/10.1002/jsfa.2740370205" @default.
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