土壤重金属铜、镉胁迫对冬小麦碳氮运转的影响

Effects of Stress of Copper,Cadmium on Carbon and Nitrogen Assimilate Translocation in Winter Wheat

在盆栽试验条件下,选用铜、镉两种金属元素各设置3个浓度水平,即Cu1(100 m g/kg),Cu2(200 m g/kg),Cu3(300 m g/kg)和Cd1(10 m g/kg),Cd2(50 m g/kg),Cd3(100 m g/kg)共6个处理,以不施金属元素处理为对照,研究了Cu,Cd胁迫对冬小麦碳氮运转的影响。结果表明,与对照相比,铜、镉处理降低了小麦叶片、茎鞘、颖壳等营养器官花前贮藏物质再运转量和再运转率以及花前营养器官总运转量和运转率,降低了粒重。其中以Cu2,Cd2处理对叶片影响最大,Cu3,Cd2处理对茎鞘、颖壳穗轴和总运转量影响最大。小麦叶片、茎鞘、颖壳等营养器官花前贮藏氮素再运转量和总运转量随铜、镉施用浓度的增加而降低,籽粒氮素积累量也随之降低,而各营养器官花前贮藏氮素再运转率和总运转率的变化较为复杂。Cu,Cd对籽粒产量、淀粉和蛋白质含量的影响均表现为随施用浓度增加而降低的趋势。

Effects of stress of copper, cadmium on carbon and nitrogen assimilate translocation in winter wheat were investigated in a potted plant culture experiment. The six treatments were Cu1 （100 mg/kg）, Cu2（200 mg/ kg）, Cu3（300 mg/kg） and Cd1（10 mg/kg） ,Cd2（50 mg/kg） ,Cd3（100 mg/kg）, and CK（0mg/kg） was no heavy metal. The results showed that,compared with CK ,Cu,Cd reduced the amounts and remobilization rate of pre-anthesis stored assimilates and total amount of pre-anthesis stored assimilate and grain weight. Effects of Cu2,Cd2 treatments on that of leaf and Cu3,Cd2 treatments on that of stalk and sheath and total amount were the maximum. The amounts of pre-anthesis stored nitrogen and nitrogen accumulation in grain were reduced with increasing of the concentration of copper and cadmium. But changes of remobilization rate of pre-anthesis stored nitrogen were complicated. The grain yield and content of starch and protein were reduced with increasing of the concentration of copper and cadmium.