Stress Response Versus Stress Tolerance: A Transcriptome Analysis of Two Rice Lines Contrasting in Tolerance to Phosphorus Deficiency

Rice

Table 1 Dry Weight, P Concentration, and Derived Parameters in Shoot and Root Samples Taken from an Experiment Conducted Parallel to the Microarray Experiment

Days	P level	Genotype	Shoot dry weight	Shoot P concentration	Root dry weight	Root P concentration	Plant P content
			g plant⁻¹	mg g⁻¹	g plant⁻¹	mg g⁻¹	mg plant⁻¹
40	−P	Nipponbare	0.61	0.77	0.42	0.95	0.86
	−P	NIL6-4	0.76 ns	0.82 ns	0.49 ns	0.90 ns	1.07 ns
	+P	Nipponbare	2.94	1.51	1.18	1.82	6.63
	+P	NIL6-4	2.19 ns	1.70 ns	1.06 ns	1.89 ns	5.72 ns
85	−P	Nipponbare	1.93	0.63	0.74	0.93	1.91
	−P	NIL6-4	3.68**	0.73*	1.33**	0.96 ns	3.96**
	+P	Nipponbare	9.60	1.32	3.43	1.75	18.69
	+P	NIL6-4	12.44 ns	1.28 ns	4.19 ns	1.72 ns	23.25*

Values are means of four replications; plants were grown in soil with (+P) or without (−P) P fertilizer. Microarray samples were taken from similar plants at 40 days after sowing
ns not significant
*p ≤ 0.05 (significant); **p ≤ 0.01 (significant) based on t tests between means of genotypes within sampling dates and P levels