The mobilization of root exudates on CdS in rice rhizosphere and their effect on Cd uptake and transport
根分泌物对根际难溶性镉的活化作用及对水稻吸收、运输镉的影响

The mobilization of wheat and rice root exudates on cadmium sulfide CdS,in rice rhizosphere and their effects on Cd uptake and transport by rice in vermiculite and nutrient solution were investigated.The result showed that the amount of dissolved Cd by the wheat and rice root exudates without Fe treatment was higher than those with Fe treatment.The reason was that they could exudate plenty of PS and PS may chelate Cd to form soluble PS\|Cd chelate complex.So the root exudates of rice and wheat without Fe treatment could mobilize insoluble Cd\|CdS in rice rhizosphere,and enhance the uptake and transport of Cd.Furthermore,the amount of Cd mobilizated by wheat root exudates were significantly higher than that by rice exudates.