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  • 1 Bulgarian Academy of Sciences Institute of Plant Physiology Acad.G. Bonchev Street, 21 1113 Sofia Bulgaria
  • 2 Bulgarian Academy of Sciences Acad. D. Kostov Institute of Genetics 1113 Sofia Bulgaria
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Investigations have been carried out on the resistance toward toxic amounts of Cu +2 in the medium of three tritordeum forms — the hexaploids: HT9 and HT31 and the octoploid HT73, containing genes of the wild perennial barley Hordeum chilense . The length and weight of the roots as well as of the above-ground part of 10-day old plants, grown on solutions with CuSO 4 .5H 2 O at concentrations of 10 −6 M and 10 −5 M and those grown on water (control) were measured. Toxic Cu 2+ concentrations in the medium resulted in an increase of the variation coefficient for the studied parameters which was more distinctly expressed in the hexaploid tritordeums. The octoploid tritordeum HT73 demonstrated greater tolerance to the heavy metal based on the changes in the weight and length of the above-ground parts of the plants. No significant changes in the pigment content and in the chlorophyll fluorescence parameters were established indicating that the photosynthetic apparatus activity was not substantially affected by toxic Cu 2+ concentrations.

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