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: | Department of Plant Nutrition , Technical University of Berlin , Lentzeallee 55–57, Berlin 33, D‐1000, Federal Republic of Germany |
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Abstract: | Abstract Ion‐specific initial salt effects due to supply of extreme K+, Na+, Cl or SO4 2‐ combinations were studied on the carbohydrate pattern as well as on the activity of amylases, phosphorylase and invertase of two soybean varieties, Jackson and the more tolerant Lee. Reducing sugars were little affected. Salinity increased leaf sucrose more in Jackson than in Lee, and more due to Cl? than to SO4 2‐ supply. Salinity increased the higher level of root sucrose in Lee less than the lower sucrose level in Jackson, independent of the nature of salination. Salinity increased leaf starch more in Jackson than in Lee. KCl increased leaf starch of Jackson most, Na2SO4. least. KCl increased leaf starch of Lee more than NaCl, while K2SO4 and Na2SO4 tended to decrease leaf starch. Only KCl stimulated amylases and phosphorylase in leaves of Jackson. Salinity changed amylases according to the starch content in leaves of Lee, while phosphorylase decreased independent of the ion combination supplied. Salinity decreased invertase in leaves of Jackson, it affected invertase in Lee only little. It is suggested that the carbohydrate metabolism dependent and independent of ionic regulation contribute to physiological salt tolerance mechanisms of soybean varieties. |
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Keywords: | Carbohydrates amylases phosphorylase invertase Glycine max varieties salt tolerance |
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