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Reduced auxin signaling (1 mm PCIB) and auxin transport (1 mm NPA) reduces auxin efflux from axillary buds on intact plants (A and B) and in decapitated plants (C and D). A and C, Total [3H]IAA recovered in the stem after 3 h; different letters (a, b) on the top of the columns indicate statistically significant differences (P < 0.05; one-way ANOVA with Tukey’s correction). Data are means ± se (n = 4). B and D, [3H]IAA exported out the buds as quantified in adjacent 3-mm stem segments.
