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Amino acid concentrations of xylem exudate and guttation sap in 7-d-old first leaves of O. sativa. The xylem exudate and guttation fluid measurements are from the combined volume of 24 plants. Values are the mean ±SE from three independent experiments. All measurements of amino acid contents in the xylem exudate are significantly different at the 5% level when compared to the respective guttation sap.
