Short-term Responses of Soybean Roots to Aluminium
| Autor: | Alexander Wissemeier, C. J. Asher, P. Szulkiewicz, Walter J. Horst, Ismail Cakmak |
|---|---|
| Přispěvatelé: | Çukurova Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 1992 |
| Předmět: |
roots
Thiobarbituric acid K+ efflux Ca Physiology Potassium MDA chemistry.chemical_element Plant Science Ethylenediaminetetraacetate TBA EDDHA Lipid peroxidation chemistry.chemical_compound Al Ethylenediaminedihydroxophenylacetate Malondialdehyde soybean membrane Ion transporter reducing capacity Callose EDTA lipid peroxidation TCA Membrane Trichloracetic acid chemistry Biochemistry Glycine Biophysics Elongation Agronomy and Crop Science callose |
| Popis: | The physiological reasons for the inhibition of root elongation by Al are not yet understood. The objective of the present studies was to clarify short-term effects of Al on plasma-membrane integrity of soybean (Glycine max L.) roots using different physiological/biochemical parameters. Initial response (0–3 h) of roots to Al (50 µM AlCl3) was a reduction of K+ net-efflux. This was most pronounced at low Ca supply (25 versus 2500 µM). Using 86Rb, it could be shown that Al effects on K+ net-efflux were mainly due to reduced K+ efflux whereas effects on K+ influx were negligible. After 2h of Al treatment, induction by Al of non-constitutive callose synthesis could be demonstrated. Lipid peroxidation was enhanced after 32h of Al treatment especially in the presence of higher Fe2+ (FeSO4) concentrations. Fe(III) reducing capacity of Fe-deficient plants, as an indicator of high activity of plasma membranebound processes, was not impaired but rather enhanced by short-term Al treatment. The results clearly indicate, that Al concentrations leading to severe inhibition of root elongation do not primarily lead to membrane disruption. However, specific membrane functions are modified by Al. © 1992, Gustav Fischer Verlag, Stuttgart. All rights reserved. |
| Databáze: | OpenAIRE |
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