Table 4
Effect of NaCl stress and silicon application on leaf photosynthetic gas exchange in rice (IR36) seedlings. Plants were exposed to 50 mM NaCl from day 14. Silicon was added from day 7 (Si7) or day 14 (Si14). Gas exchange measurement was made on the recently fully expanded leaves after 3 days of salt stress. Water use efficiency (WUE)
was calculated as the ratio PN /E ( mol CO2 mmol−1 H2 O). Mean ± se followed by the same letter indicates no significant differences at P < 0.05. PN , net assimilation rate; gs , stomatal conductance; E, transpiration rate; Ci , intercellular CO2 .