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a: Germination rate. b: Germination vigor. 1: 0.1 mM. 2: 0.25 mM. 3: 0.5 mM. 4: 1.0 mM. Error bars present standard errors of five independent biological replicates. The same upper- and lower-case letter indicates a non-significant difference (p > 0.05), different lower-case letters indicate a significant difference (p<0.05), different upper-case letters indicate a strongly significant difference (p<0.01).
