Table 1.

Summary of microarray datasets and experimental parameters.

References	Accession number	Database	Number of arrays selected	Name in this paper	Nitrate concentration (mM)	Time treatment (min)	Tissue	Growth stage	Growth condition
Wang et al., 2003	NASCARRAYS-479	NASC Arrays	4	1	0.25	20	Whole roots	Seedling	Hydroponic
Wang et al., 2004	NASCARRAYS-480	NASC Arrays	4	2	5	120	Whole roots	Seedling	Hydroponic
Gutiérrez et al., 2007a	E-MEXP-828	Array Express	8	3	5	480	Whole roots	Adult	Hydroponic
				4	10	480	Whole roots	Adult	Hydroponic
				5	15	480	Whole roots	Adult	Hydroponic
Gifford et al., 2008	GSE7631	GEO	42	6	5	120	Lateral root cap	Seedling	Hydroponic
				7	5	120	Epidermis + Cortex	Seedling	Hydroponic
				8	5	120	Endodermis + Pericycle	Seedling	Hydroponic
				9	5	120	Pericycle	Seedling	Hydroponic
				10	5	120	Stele	Seedling	Hydroponic
				11	5	120	Whole roots	Seedling	Hydroponic
				12	5	210	Whole roots	Seedling	Hydroponic
Krouk et al., 2010a	GSE20044	GEO	24	13	1	3	Whole roots	Seedling	Hydroponic
				14	1	6	Whole roots	Seedling	Hydroponic
				15	1	9	Whole roots	Seedling	Hydroponic
				16	1	12	Whole roots	Seedling	Hydroponic
				17	1	15	Whole roots	Seedling	Hydroponic
				18	1	20	Whole roots	Seedling	Hydroponic
Hu et al., 2009	GSE9148	GEO	6	19	25	30	Whole roots	Seedling	Hydroponic
Ruffel et al., 2011	GSE22966	GEO	18	20	5	120	Whole roots	Seedling	Agar plates
				21	5	480	Whole roots	Seedling	Agar plates
				22	5	2880	Whole roots	Seedling	Agar plates
Patterson et al., 2010	GSE29589	GEO	9	23	1	90	Whole roots	Seedling	Hydroponic
				24	1	480	Whole roots	Seedling	Hydroponic
Vidal et al., 2013	GSE35544	GEO	6	25	5	120	Whole roots	Seedling	Hydroponic
Álvarez et al., submitted	GSE43011	GEO	6	26	5	120	Whole roots	Seedling	Hydroponic
Wang et al., 2007	NASCARRAYS-481	NASCArrays	4	27	0.25	20	Whole roots	Seedling	Hydroponic