however, at elevated [CO2] an increase of 1.74 fold in the PIP1 abundance was observed at 90 mM NaCl. At ambient [CO2], the PIP2 protein abundance was in creased 1.25-fold by the 90 mM NaCl treatment, relative to the control (Fig. 3B), whereas at elevated[CO2] both salt treatments, 60 and 90 mM NaCl, increased PIP2 abundance, 2.5- and 2-fold, respectively, compared to the control.Generally, the enhanced [CO2] decreased the PIP1 and PIP2 contents with respect to ambient [CO2].