FIGURE 5.
Effects of 2 mM Glu + 2 mM MgCl2 pre-treatments with or without 0.5 mM PG on Chls and their three precursors after the subsequent cold stress. After the pretreatments with Glu, MgCl2, or PG for 48 h at the room temperature, cold stress was performed at 4 ± 1°C for additional 72 h. Levels of Chl precursors ALA (A), Proto IX (B), Mg-Proto IX (C), and seedling total Chls (D) were determined. F.W., fresh weight. Error bars show standard deviations (n = 3). Different lowercase letters indicate significant differences at 0.05 (P < 0.05) levels.