Table 1.

Description of water-deficit treatments imposed: soil water content and potential, dates of start of water deficit and rewatering, and number of fully expanded leaves at these moments

					Days after emergence		Fully expanded leaves
Expt	Species	Treatment	Soil water content (g g−1)	Soil water potential (Mpa)	Start of water deficit	Rewatering	Start of water deficit	Rewatering
1	A. thaliana	Early, long water deficit	0·22	−0·55	13	31	0	12
2	H. annuus	Early, long water deficit	0·20	−0·65	18	49	1	9
3	H. annuus	Early, long water deficit	0·20	−0·65	16	49	2	8
		Early, short water deficit	0·20	−0·65	16	30	2	4
		Late water deficit	0·20	−0·65	29	49	4	8
4	H. annuus	Early, long water deficit	0·20	−0·65	17	56	2	8
		Early, short water deficit	0·20	−0·65	17	28	2	4
		Late water deficit	0·20	−0·65	27	56	4	8
		Severe water deficit	0·18	−1·31	17	56	2	8

Control plants of A. thaliana were kept at a soil water content of 0·50 g g⁻¹ (soil water potential = −0·3 MPa), and control plants of H. annuus at a soil water content = 0·30 g g⁻¹ (soil water potential = −0·04 MPa).