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Effect of different N forms (NH4NO3, NO3− in the presence of HCO3−) on apoplast pH in xylem vessels (first to fourth order according to Canny, 1990) and of hair cells (n = 27; ±sd) of young sunflower leaves after infiltration with xylem sap of the different nutritional N sources
| Apoplast pH | Light
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|---|---|---|---|---|
| NH4NO3 | NO3−/HCO3− | NH4NO3 | NO3−/HCO3− | |
| Xylem vessel | 5.14 ± 0.24 | 5.16 ± 0.24 | 5.21 ± 0.10 | 5.22 ± 0.14 |
| Hair cell | 5.61 ± 0.23 | 5.72 ± 0.22 | 5.80 ± 0.15 | 5.82 ± 0.23 |
