Abstract
Two Rumex dentatus populations, one from copper (Cu) mine and the other from uncontaminated site, were studied for sucrose metabolism of seed under Cu stress. Cu treatment significantly inhibited vacuolar invertase activity in non-metallicolous population (NMP), while it in metallicolous population (MP) was markedly higher than control. At control, cell wall invertase activity in MP showed little difference from NMP. However, after Cu treatment, cell wall invertase activity in MP was significantly higher than NMP. Activity of N/A-Inv was not affected by population or Cu treatment. Compared with control, sucrose and reducing sugars contents in MP were increased by Cu treatment, but those in NMP was decreased. Cu concentration in seed of NMP was higher than MP under Cu stress. These results suggested less Cu transported to seed and efficient sucrose metabolism in seed of MP might be partly reasons why R. dentatus can successful reproduction at Cu enriched soils.
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