Table III.

The number of changes in transcripts for genes in response to Fe starvation under different P conditions

Numbers of genes whose transcript change in response to Fe deficiency in P-sufficient and -deficient conditions were determined by comparing the levels of transcripts under −Fe+P versus +Fe+P or under −Fe−P versus +Fe−P. Differential expression analysis was performed with P value correction (Benjamini and Hochberg, 1995) at the 0.05 level.

Tissues	Nos. of Fe Response Genes					Percentage Genesa
	P Sufficient			P Deficient
Roots	P ≤ 0.05	Up	3,476	Up	191	86.4
				Down	280
				No change	3,005
		Down	4,152	Up	216	90.3
				Down	186
				No change	3,750
Shoots	P ≤ 0.05	Up	1,272	Up	62	90.0
				Down	62
				No change	1,145
		Down	1,188	Up	56	91.8
				Down	41
				No change	1,091

^aThe percentage of genes that showed antagonistic responses to –Fe and –P.