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Effect of exogenous phosphate (Pi) application on expression level of the Pi starvation-induced gene PHO2 in fertilized ovules of the Xanthoceras plants without Pi application and with Pi application, which were normalized to the expression level of actin-2 as a reference. The values are the means of five biological replicates with standard error bars. Asterisks indicate significant difference at p < 0.05 (ANOVA, Tukey’s HSD test).
