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- W2091835670 abstract "The influence of plant ontogeny on xylem exudate K+ concentrations and K+ transport to the shoot was studied in both nutrient-solution and field-grown tomato plants (Lycopersicon esculentum). K+ concentrations in xylem exudate from decapitated plants decreased during tomato plant development from a high of 12 mM to a low of 5 mM. In the nutrient-solution plants, the most rapid decline occurred during the vegetative growth phase, while in field-grown plants, the xylem K+ concentrations remained high during an-thesis and then subsequently declined. The rapid decline in nutrient-solution plants might be related to a decrease in the absorptive efficiency of the root system. In field-grown plants, a reduction in the availability of assimilates to the root might account in part for the decrease in xylem exudate K+ concentrations. The volume (ml h−1 plant−1) and the net rates of K+ exudation (mmol h−1 plant−1) decreased dramatically as the fruits approached maturity. Since only a small reduction in xylem exudate K+ concentrations occurred during fruiting, the hydraulic conductivity of the root system decreased as the tomato plants aged. It is proposed that the ontogenetic changes in xylem transport of K+ contribute to a reduction in leaf free space K+ concentration which would explain the decline in tomato leaf K+ concentrations." @default.
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- W2091835670 date "1982-12-01" @default.
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- W2091835670 title "Ontogenetic changes in potassium transport in xylem of tomato" @default.
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- W2091835670 doi "https://doi.org/10.1111/j.1399-3054.1982.tb04540.x" @default.
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