biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 8:142, 1966 | DOI: 10.1007/BF02930623

The effect of zinc on the biosynthesis of tryptophan, andol auxins and gibberellins in barley

Nikola Mašev1, Milan Kutáček1
1 Department of Radiobiology, Institute of Experimental Botany, Czechoslovak Academy of Sciences, Praha

The action of zinc on the growth of barley and the biosynthesis of indol compounds and gibberellin-like substances was investigated in a number of concentrations of zinc from doses stimulating growth to toxic doses. The seeds were soaked before sowing in solutions of zinc sulphate (5.10-5 to 5.10-1% Zn), and the plants cultivated for 7 days in water. Lower concentrations of zinc increased both plant growth and the biosynthesis of tryptophan and auxins. At the optimum concentration of 5.10-3% Zn this increase in tryptophan amounted to 241% of the variant without zinc; in substances with an RF corresponding to indolyacetic acid, the increase determined by the biological test, was 207% as against the variant without zinc. Higher concentrations of zinc inhibited growth, the tryptophan content was decreased to below that of the control without zinc and the auxin content also fell to below the control values. Zinc also influenced the content of gibberellin-like substances in the plants. At a concentration of 5.10-3% Zn the increase in the growth activity in the gibberellic acid area of the chromatogram was 294% of the variant without zinc. At toxic concentrations of zinc, the content of gibberellin-like substances fell to below that of the controls. The finding that zinc acts simultaneously on the biosynthesis of auxins and gibberellins is also evidence for the common action of growth substances of various chemical types on plant growth.

Received: March 26, 1965; Published: March 1, 1966  Show citation

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Mašev, N., & Kutáček, M. (1966). The effect of zinc on the biosynthesis of tryptophan, andol auxins and gibberellins in barley. Biologia plantarum, 8(2), 142. doi: 10.1007/BF02930623
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