the second experiment (Figure 4) grew bigger than in
the first experiment (low salt stress; Figure 3) for both
Fatmawati and IR64, while the plants grown in 100 mM
NaCl reached a similar size in both experiments. The
increase in biomass reduction is therefore primarily a
result of the control plants growing bigger in the second
experiment. The late reduction in growth rate in response
to salinity in both experiments suggests that the plants experience
ionic stress, which can be determined by measurements
of leaf senescence and leaf ion concentration.