Table III. Concentrations of organic acids in roots, stems, and leaves of the HE S. alfredii under Cd exposure

Plants were treated with 0 or 100 μm Cd for 30 d. The results are presented as means of three replications.

SampleCd LevelsMalic AcidCitric AcidOxalic Acid
μmμmol g−1 fresh wt
Young leaves035.9 ± 4.62.3 ± 0.11.2 ± 0.0
10043.6 ± 5.82.7 ± 0.21.3 ± 0.3
Mature leaves038.9 ± 4.02.8 ± 0.31.0 ± 0.2
10046.0 ± 4.93.0 ± 0.51.1 ± 0.2
Stems036.2 ± 4.82.3 ± 0.21.2 ± 0.2
10043.6 ± 5.32.7 ± 0.71.4 ± 0.4
Roots06.1 ± 0.25.3 ± 1.22.8 ± 0.4
1007.2 ± 0.77.8 ± 1.13.8 ± 0.3