Silene metal tolerance

Fig. 3-3. Relative available metal ion concentrations (top) and relative metal tolerances to the ions (bottom) for six populations of Silene vulgaris. In both graphs, for each metal the population with the highest tolerance or soil metal concentration has been given the value of 100 all the other populations have been expressed relative to this. Key to populations Am Amsterdam (normal, control) PI Plombieres Br Breinig Im Imsbach Bl Blankenrode Ma Marsberg Ha Harlingerode. Drawn from data in Schat and ten Bookum (1992b).

Schat H, Vooijs R and Kuiper E (1996) Identical major gene loci for heavy metal tolerances that have independently evolved in different local populations and subspecies of Silene vulgaris. Evolution 50 1888-1895. 

Some plant and microbial species have developed unique and sometimes high tolerance for metals. Plant species of Agrostis, Minuartia, and Silene are known for their tolerance to heavy metals (Sieghardt, 1990 Verkleij et al., 1991). In a study... 

Enzyme induction is an indirect effect of metal toxicity. In consequence, it only appears after in-vivo metal application. Increase in capacity in the presence of toxic concentrations of metals implies that the enzyme involved is insensitive to or well masked from direct metal action. In Silene cucubalus POD and to a lesser extent ICDH were shown to be very tolerant to zinc, copper and cadmium applied in-vitro (Mathys, 1975). MDH extracted from roots of both copper tolerant and non-tolerant clones of Agrostis stolonifera was found to be insensitive in-vitro to copper concentrations up to 180 im. However, in the literature, conflicting results are reported about the effects of in-vitro and in-vivo application of metals on enzymes. In Phaseolus vulgaris, GDH was inhibited by cadmium in-vitro, while an induction was found after in-vivo application of a toxic dose of the same metal (Weigel and Jager, 1980b). 

Schat, H., Vooijs, R., 1997. Multiple tolerance and eo-tolerance to heavy metals in Silene vulgaris a cosegregation analysis. New Phytol. 136, 489-496. 

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