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Effects of exogenous NO on XET activity (A) and relative expression (relative to that of UBQ10R) of XTH-32 (B) in root tips of ZH2 and 99–1507 with 100 μM Al treatment for 12 h. Scale bars = 100 μm. Values represent means ± SD (n = 3). Different letters indicate significant differences at P < 0.05.
