Influence of extreme K:Na ratios and high substrate salinity on plant metabolism of crops differing in salt tolerance |
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Authors: | G Rathert H‐W Doering |
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Institution: | Faculty of International Agricultural Development Department of Plant Nutrition , Technical University of Berlin , Lentzeallee 55–57, Berlin 33, D‐1000, Federal Republic of Germany |
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Abstract: | Mineral regulation of two soybean varieties Jackson and Lee was investigated in long term water culture experiments using saline solutions. The effects of extreme K:Na ratios using chloride and sulfate as counterions were studied in the early stages of salinity. The growth rates of both varieties were not affected by salinization. A K+ stimulated, intensive acropetal Cl‐ translocation was observed in the salt sensitive variety Jackson. The varieties did not differ in Na+ translocation and in the suppression of Ca2+ and Mg2+ in the leaves. But the effect of the nature of salinization indicates already differences in Na uptake and translocation of the cultivars. The avoidance of Cl‐, but also of Ha+, in connection with influences of the resulting ionic imbalance on metabolic pathways are probably the most causative factors for the different tolerance to salinity of the two soybean varieties. |
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Keywords: | K+ Na+ Cl‐ SO4 2‐ salinity growth ion regulation different salt tolerant soybean varieties |
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