Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 2004. Sectio Biologiae. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 25)

Zsoldos, F., Vashegyi, Á., Pécsváradi, A. and Bóna, L.: Aluminium toxicity in roots: correlation between root elongation and potassium fluxes in aluminium-sensitive and aluminium-tolerant cereal species

Aluminium Toxicity in Roots. 165 elongation at these low pH values is often closely and causally related to high activities of monomeric Al, and thus, Al-toxicity. The positive correlation of P and Al in roots of sorghum was reported earlier (Bergmann 1992; Okki 1987). In summary, our results indicate that there is an interaction between Al and P (Figs. 3 and 4). In Clarkson's work (1967) the P associated with Altreated roots was inorganic and almost entirely exchangeable. Increasing P supply in the growth medium (Fig. 3) can precipitate and thus detoxify Al. When plants are growing in a soil where Al and P are both present it is possible to envisage this adsorption precipitation reaction as a continuous process which would effectively reduce the amounts of P and toxic Al available in soil solution for plants. Conclusion Four cereal species were tested in this study. The durum wheat (GK Betadur) proved to be much more sensitive to the stress conditions examined than the common wheat (Jubilejnaja 50) and the triticale (GK Marco). As it was expected rye (GK Wibro) turned out the most tolerant type in our experiments. The results confirmed that in acidic environment phosphate ion cause a significant decrease in the toxic effect of Al. Acknowledgements Financial support of Hungarian Scientific Research Fund (OTKA T 032132 and T 037385) is gratefully acknowledged. Thanks are due to Mrs. Ibolya Szabó for her excellent technical assistance. References ARCHAMBAULT, D. J., ZHANG, G. AND TAYLOR, G. J. (1997): Special variation in the kinetics of aluminium (Al) uptake in roots of wheat (Triticum aestivum L.) exhibiting differential resistance to Al. Evidence for metabolismdependent exclusion of Al. J. Plant Physiol. 151, 668-674. BERGMANN, W. 1992 Nutritional Disorders of Plants. Gustav Fischer Verlag, Jena. BÓNA

, L., BALIGAR, V. C. AND WRIGHT, R. J. (1995): Soil acidity effects on agribotanical traits of durum and common wheat, pp. 425^428. In: R. A. Date, N. J. Gurdon, G. E. Rayment and M. E. Probert (eds.), Plant-Soil Interaction at Low pH: Principles and Management. Kluwer Acad. Publ., Dordrecht, The Netherlands. BÓNA

, L., F. ZSOLDOS, Á. VASHEGYI, M. MOUSTAKAS AND L. PURNHAUSER. (1998): Root and shoot growth of common and durum wheat seedlings influenced by low pH and aluminium stress. In: Progr. in Bot. Res., Proc. First Balkan Botanical Congress, Thessaloniki. (eds. Tsekos, I. and