Figure 1.

Diel (24 h) net CO₂ exchange pattern of the shoot of a 97-d-old, flowering plant of M. crystallinum grown in hydroponic solution containing 400 mm NaCl. White bar indicates the light period; black bar indicates the dark period. The sum of the areas between the net CO₂ exchange trace and the zero line, designated 1 and 3, represents net CO₂ uptake during the light period. Area 1 plus area 3 minus area 2 represents net CO₂ balance during the light period. Area 5 represents net CO₂ uptake during the dark period. Area 5 minus area 4 minus area 6 represents net CO₂ balance during the dark period.