EFFECTS OF DIFFERENT CONCENTRATIONS CD ON MINERAL ACCUMULATION AND PHOTOSYNTHESIS PARAMETERS IN SALIX MATSUDANA KOIDZ

Cd accumulation and translocation, chlorophyll contents, photosynthetic parameters, and photosynthetic fluorescence parameters were investigated in S. matsudana exposed to 10, 50 and 100 mu mol/L Cd for 7, 14, 21 and 28 d. The results indicated that the Cd contents of different organs increased with increasing of Cd concentration and prolonging of treatment. The contents of Fe, Mn, Cu and Zn decreased significantly (P<0.05). The low concentration of Cd (10 mu mol/L) did not significantly decreased the chlorophyll content of the leaves, net photosynthetic rate (P-n) and photosynthetic fluorescence parameters such as F-0, F-m, F-v/F-m, qP and qN. While high concentration of Cd treatment (100 mu mol/L) significantly reduced the content of chlorophyll a, b and a+b (P<0.05), P-n, F-0, F-m, F-v/F-m, qP, qN and ETR. The parameters of P., Fm, Fv/Fm and ETR were significantly changed in 50 mu mol/L only after long-term treatment (28 days) (P <0. 05).