PJB-2017-814
PHYSIOLOGICAL RESPONSES TO HIGH CONCENTRATION OF ZN, PB, CU, OR CR POLLUTED WATER IN L.MINOR FROND
PENG XUE
Abstract
Environmental preservation and the threat of heavy metal water pollution are issues of growing concern. In the present study, we investigated the physiological responses to high concentrations of zinc (Zn), lead (Pb), copper (Cu), or chromium (Cr) on malonaldehyde (MDA) and chlorophyll content, as well as the activity of peroxidase (POD) of Lemna minor. In addition, an experiment of frond abscission affected by high heavy metals concentration within 12 h was also been conducted. Results showed that: (a) Pb, Zn, Cu, and Cr increase MDA content and Pb, Cu, and Cr decrease POD activity, although some of these effects are only seen at high concentrations; (b) Cu and Cr decrease chlorophyll content whereas Zn can increase chlorophyll content; (c) all the heavy metals can induce colony disintegrate compare to CK treatment, and the percentage of frond abscission reached at a platform (except for Pb) after exposure for 10 h. The frond abscission rate of Zn, Cu and Cr treatments is higher than EFAC50 after 10 h while that in Pb treatment is much lower at the same period.
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