Effect of Cu stress on the invertase activity and root growth in two populations of Rumex dentatus L. with different Cu tolerance

Environmental Toxicology
Yu HuangJing-Qing Gao

Abstract

There has been no study on key enzymes in sucrose cleavage in metallophyte plants so far, which may be crucial for the plants' root growth and heavy metal tolerance maintenance. Acid invertases are rate-limiting enzymes in sucrose metabolism. Here, we tested the hypothesis that the roots of copper-tolerant plants should manifest a higher activity of acid invertases than nontolerant plants both for supporting growth and for their maintaining tolerance under Cu stress. Two populations of Rumex dentatus L., one from an ancient waste heap at a Cu mine (Cu-tolerant population), and the other from a noncontaminated site (Cu nontolerant population), were used in the experiments. The seedlings of Rumex dentatus L. were exposed to 0, 10, and 40 microM CuCl(2) for 14 days. Cu exposure had a stronger inhibition on root growth and thus resulted in a lower root/shoot ratio in the plants of nontolerant population compared with the Cu-tolerant population. Cu exposure showed a stronger inhibition of acid invertase activity of Cu nontolerant plants than Cu tolerant plants, whereas neutral/alkaline invertase was insensitive to Cu. A positive correlation between the activity of acid invertases and the root growth and root/shoot ratio was observed...Continue Reading

References

Jan 1, 2003·Journal of Experimental Botany·T RoitschA K Sinha
May 9, 2003·Journal of Plant Research·Fumio TakahashiHitoshi Suzuki
Nov 27, 2004·Trends in Plant Science·Thomas Roitsch, Mari-Cruz González
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Feb 17, 2006·Proceedings of the National Academy of Sciences of the United States of America·Lidiya I SergeevaDick Vreugdenhil
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