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Temporal courses of the concentration and atom % excess (APE) of the five major amino acids present in xylem sap of walnut. Values are means of four trees sampled during 4-d periods. Bars are ses. Lines are the fitted gaussians, the form of which is: y = a + b/[(2*Π)0.5 * s] * exp{[−(x − m)2/2s2). R2 values are 0.96, 0.67, 0.90, 0.97, and 0.58 for Arg, Gaba, Gln, Cit, and Asp, respectively. For concentration, note the differences of scale between amino acids.
