Fig. 6.

Net CO₂ exchange over a 24-d period by the shoot of a Sesuvium portulacastrum plant growing in a 0.5-l pot containing non-saline soil. Watering was withheld on day 4 (red arrow) and recommenced on day 21 (blue arrow). The grey shaded areas represent the 12-h dark periods. Photon flux density was 700 µmol m⁻² s⁻¹ at the level of the shoot. On the last day of the experiment, the total leaf area was 6 cm², the leaf dry mass was 0.129 g, and the stem dry mass was 0.024 g.