重金属铜在甘蔗体内的吸收及对甘蔗产量和品质的影响

Cu Uptake by Sugarcane and Its Effects on Sugarcane Yield and Quality

通过盆栽试验,研究重金属Cu在甘蔗体内吸收、积累规律及对甘蔗产量和糖分的影响情况。结果表明,根、茎、枯叶、梢头对Cu的积累能力总体表现为根>茎>枯叶>梢头,甘蔗各部分器官Cu含量随外源投放的Cu浓度而增加,呈显著的正相关。少量的Cu会使甘蔗明显增产,但胁迫或过量对甘蔗的生长和生物量的影响不明显。Cu过量对甘蔗品质的影响表现在出汁率、还原糖的增加和纤维分的降低,适当地施Cu会增加甘蔗的产糖量,但过多会减低甘蔗的产糖量。

The pot experiment was conducted to study Cu uptake and accumulation in sugarcane and its effects on sugarcane yield and sucrose. The results showed that the ability of different organs in accumulating Cu was in an order of root 〉 stem 〉 dead leaves 〉 top plant. Cu contents in different organs of sugarcane showed significant positive correlations with the increase of exogenous Cu. Low content of Cu increased sugarcane yield, however, there are not obvious effects on sugarcane growth and biomass on the conditions of Cu stress or excessive Cu. The effects of excessive Cu on sugarcane quality mainly expressed in the increases of the rate of juice and reducing sugar and the decrease of fiber content, appropriate Cu fertilizer could increase sugar yield.