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. 2020 Jun 3;11:746. doi: 10.3389/fpls.2020.00746

FIGURE 4.

FIGURE 4

Light intensity dependence of photosynthetic quantum yields of PSI [Y(I)] and PSII [(Y(II)] in leaves of Al stressed alfalfa seedlings with or without apical buds. Five treatments in the seedlings with apical buds are as Figure 1, and seedlings without apical buds are grown in 1.5 mM Ca(NO3)2 medium (pH 4.5) and treated with or without spraying IAA (pH4.5-IAA, pH4.5+IAA), 100 μM AlCl3 with or without spraying IAA (pH4.5+Al-IAA, pH4.5+Al+IAA), and 100 μM AlCl3 and 50 μM MgCl2 with or without spraying IAA (pH4.5+Al+Mg-IAA, pH4.5+Al+Mg+IAA). The Y(I) (A) and Y(II) (B) were estimated from seedlings with apical buds, and Y(I) (C) and Y(II) (D) were estimated from seedlings without apical buds at the third day after the initiation of treatments. Data are means ± SE of three replicates. Bars with different letters indicate significant difference at P < 0.05 (least significant difference test).