Relative steady-state mRNA abundance of key CAM-specific enzymes over a 24-h period in plants exposed to 0.3 m NaCl for 10 d. A, RT-PCR products from Ppck, Ppc1, plastidic Pgm2, Glc-6-P, Gpt2, and Ubq1 in wild type (WT) and two CAM-deficient lines, 351 and 371. Representative gels from duplicate assays are shown. B to E, Relative transcript abundance normalized to Ubq1 expression for Ppck1 (B), Ppc1 (C), Pgm2 (D), and Gpt2 (E) in WT (black circles) and two CAM-deficient lines, 351 (white squares) and 371 (white circles). Values plotted are the mean of two replicates.