Figure 7.

Lignin deposition across a developmental gradient in almond rootstocks. Lignin deposition across the developmental gradient in E1, C5, and K86 treated with 0, 50, and 150 mM NaCl for 3 days. (A) Representative images of lignin staining in the roots of E1, C5, and K86. Scale bar, 100 μm. Yellow box highlights the exodermis; cells highlighted by a green box are quantified for fluorescence intensity. Blue box highlights the endodermis; cells highlighted by a green box are quantified for fluorescence intensity. White arrows indicate the lignified cells in exodermis and endodermis in E1. Yellow arrows indicate that K86 shows a reduction in the number of lignified cells. Quantification of lignin staining in exodermis (B) and endodermis (C) of E1, C5, and K86 shows increased lignification in response to salinity stress in both E1 and C5, but not in K86. Values are means ± SE (n = 15). Lowercase letters indicate a significant difference at p < 0.05, three-way ANOVA.