Figure 3.

Drought causes changes in pectin distribution in floral abscission zone (AZ) of yellow lupine. Lupines were cultivated under water deficit conditions (25% WHC), while control plants were grown in the soil of optimal moisture (70% WHC). Sections of floral AZs were collected on the 48th day of cultivation. The total content of pectin based on pectin absorbance (A). Data are presented as averages ± SE (n = 3). Significant differences in the stressed plant in comparison to control plants are ** p < 0.01 (Student’s t-test). De-esterified pectin staining using Ruthenium red in the control AZ (B–D) and drought-stressed (E–G). AZ area is marked by the black dotted line (B,E). Arrowheads indicate the place of de-esterified pectin accumulation. Abbreviation: VB—vascular bundles. Bars are given in each image.