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Effect of P deficiency on expression of genes for ethylene biosynthesis enzymes. Seedlings were transferred to P-depleted (−P) or P-supplied (+P) nutrient solution for 1 week. After treatment, total root RNA was subjected to qRT-PCR using gene-specific primers. Data are means ± s.d. (n = 4). Asterisks indicate a significant difference from Nip at P < 0·05.
