Variation in copper tolerance among homokaryotic and dikaryotic mycelia of Polyporus palustris Berk. et Curt
1970
Osborne, L.D. | Da Costa, E.W.B.
Investigations were made of the variation in copper tolerance among homokaryons and dikaryons originating from one dikaryotic isolate of Polyporus palustris, as shown by their growth on nutrient agar containing copper sulphate, usually at 0.32 M concentration (c. 8 per cent of CuSO4.5H2O). Homokaryons obtained by monobasidiospore isolation were crossed and further homokaryons obtained in the same way. Selection for copper tolerance gave an increase in the second generation, but no further increase in the third; whilst selection for copper sensitivity gave substantial increases in both second and third generations. It is concluded that copper tolerance in this fungus is controlled by a number of genes. It was found that, in this fungus, the copper tolerance of a dikaryon was substantially greater than that of either of its constituent homokaryons. It was also found that different isolates of P. palustris varied very widely in copper tolerance.
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