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Net CO2 exchange over an 11-d period by an individual leaf of a Sesuvium portulacastrum plant growing in soil supplemented with sea-salt. Watering was withheld on day 2 (red arrow) and recommenced on day 9 (blue arrow). The grey shaded areas represent the 12-h dark periods. Photon flux density was 480 µmol m−2 s−1. Gas exchange was measured on a leaf area of 2.98 cm2.
