Table I. Induction of Pi-responsive genes in Arabidopsis roots.

Data represent means from three biological replicates. Fold changes are based on the differences in expression level between Pi-deficient and Pi-sufficient plants. The numbers in parentheses are P values adjusted for multiple testing by the method of Benjamini and Hochberg (1995).

Locus	Annotation	Fold Expression (Log2)
		1 h	2 h	24 h
At3g17790	ACP5, acid phosphatase	−0.37 (0.92)	1.10 (0.15)	3.12 (0.002)
At5g20150	SPX1, SPX DOMAIN GENE1	0.22 (0.95)	1.63 (0.007)	3.17 (0.0003)
AT2G45130	SPX3, SPX DOMAIN GENE3	−0.10 (0.97)	0.06 (0.92)	1.18 (0.003)
At2g38940	Pht1;4, Pi transporter	−1.27 (0.14)	−0.19 (0.87)	1.37 (0.16)
At3g02040	SRG3, glycerophosphodiester phosphodiesterase	0.11 (0.97)	0.56 (0.12)	1.82 (0.0004)
At1g73220	OCT1, ORGANIC CATION/CARNITINE TRANSPORTER1	0.74 (0.76)	0.47 (0.71)	4.18 (0.0008)
At5g20790	Unknown protein	0.01 (1.00)	0.08 (0.94)	1.57 (0.009)
At1g69930	ATGSTU11	2.34 (0.09)	3.82 (0.0009)	0.43 (0.94)
At2g02990	RNS1, ribonuclease	0.21 (0.96)	4.16 (7.39E-06)	2.93 (0.001)