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Effects of exogenous NO on Al-induced root elongation growth and cell death in root tips of ZH2 and 99–1507 exposed to 100 μM Al treatment for 12 h. (A) Effects of Al, SNP, and cPTIO on root elongation (CK = control). (B) Effects of Al, SNP, and cPTIO on cell death. Values represent means ± SD (n = 3). Different letters indicate significant differences at P < 0.05.
