Effects of Copper Stress on the Chlorophyll a Fluorescence Induction Kinetics of Amaranthus mangostanus L.

The effect of Cu-added nutrient fluid on the root of Amaranthus mangostanus L.was investigated in this experiment.Also,the function changes of the photosystemⅡ(PSⅡ) reaction center in Amaranthus mangostanus L.,and the influences of copper in donor and acceptor sides of this system were investigated by the method of fluorescence induction kinetics.The results showed that copper stress inactivated the PSⅡreaction center in the leaves of Amaranthus mangostanus L.,decreased the maximal photochemical efficiency of PSⅡ(FV/FM),and damaged the acceptor side of PSⅡseriously and inhibited the transfer of linear electrons,and also did harm to the oxygen evolving complexes(OEC) of the donor side of PSⅡ.It could be concluded that the damage of copper stress in Amaranthus mangostanus L.was begun from the donor and acceptor sides of PSⅡin leaves.