ISHS Acta Horticulturae 526: V International Symposium on Grapevine Physiology
NITRATE AND CHLORIDE TRANSPORT INTERACTION IN GRAPEVINE |
| Authors: | E. Miklós, Zs. Szegletes, L. Erdei |
| Keywords: | nitrate, chloride, grapevine variety, ion transport |
| Abstract:
The effect of nitrate and chloride on the ion transport of rootstock varieties (Fercal, Rupestris du Lot, Georgikon 28) and a scion Kahet was examined with 25 mM Ca(NO3)2 or Ca(Cl)2 treatment of rooted one node cuttings grown in 1/10 Hoagland solution. Roots and leaves were analysed for water extractable fraction of anions (NO3-, Cl-, HPO42-, SO42-; HPLC method) and cations (K+, Ca2+, Mg2+, Na+, AAS method). Varietal differences in anion content of the roots were significant: 5–10 times higher anion levels were measured in Georgikon 28 and Rupestris du Lot than in Kahet and Fercal and this difference was smaller in the leaf blades. Cl- was the most mobile anion in the plants reflected by the high Cl- level of the roots and leaves in Cl- treatments. Two different defending mechanisms can be distinguished on the basis of Cl- content of the roots: Cl- accumulation (Georgikon 28 and Rupestris du Lot, 2331 and 1845 μmol/gdw. Cl- respectively) and Cl- exclusion (Kahet and Fercal, 230 and 518 μmol/gdw. Cl-).. A mutual interference of Cl- and NO3- ions could be observed. Elevated level (50 mM) of Cl- or NO3- in the nutrient solution inhibited the transport of the other anion to a large extent. In Cl- treatments the NO3- concentration of the roots was decreased to 30–60% of the NO3- content of the control plants. In the presence of 50 mM NO3-, Cl- was not found in the roots of Rupestris du Lot and Georgikon 28 and in Kahet and Fercal the low control Cl- level was slightly affected. In 25 mM Ca(Cl)2 treatments the intensive Cl- transport was accompanied by the increase of the water soluble K+, Ca2+ and Mg2+ concentration in the leaves. | |
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