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Plant and Cell Physiology, 1979, Vol. 20, No. 1 185-192
© 1979

Article

The concentration of selected cations in normal and crown-gall tumors obtained from potato discs

Jim Radosevich and Alan G. Galsky

Department of Biology, Bradley University Peoria, Illinois 61625, U.S.A.

Crown-gall tumor tissue obtained from potato discs inoculated with virulent strains of Agrobacterium tumefadens contained higher concentrations of K+, Mg2+ and Ca2+ than the corresponding normal tissue. These tumors also contained higher concentrations of these cations than normal tissue inoculated with an avirulent strain of Agrobacterium tumefadens, or than normal tissue adjacent to the crown-gall tumors on the same potato disc. The concentration of these cations remained significantly higher than control tissue regardless of the tumor age. 2,4-Dinitrophenol and myo-inositol, while affecting the concentration of Ca2+ in these tissues, had no effect on the Mg2+ and K+ concentrations. These results suggest increased concentrations of certain cations may be a specific property of crown-gall tumors.

(Received August 16, 1978; )
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