Comparative Responses of a Copper-tolerant and a Copper-sensitive Population of Minuartia hirsuta to Copper Toxicity

摘要: Summary The response of two populations Minuartia hirsuta with different copper tolerance to an excess was studied. population originatin from contaminated sites showed a distinct copper. A more vigorous growth tolerant plants under increasing concentrations found, since their root-length and chlorophyll content were higher than the control, as well unchanged percentage survival. In contrast, treatments caused progressive reduction in above mentioned parameters copper-sensitive plants. total uptake its distribution between roots shoots differ significantly populations. At all external sensitive took up copper, concentration allocated shoot, compared differentiation observed respect calcium, magnesium, iron potassium shoot-leaves. Under direct relation calcium both shoot-leaves, while revealed inverse plant tissues. magnesium decreased presence levels and, especially, seems be unaffected plants, supply observed. dropped It likely that constitutive mechanism also operates shoot root this contributes increased requirements