铜胁迫对鸭跖草的生长及生理特性的影响

通过盆栽试验研究了不同浓度铜离子对鸭跖草的生长及生理特性的影响.处理用的铜离子浓度为20、50、100、200和400mg/L,以去离子水作对照组.研究结果表明,在5种不同浓度的铜离子浇灌下,鸭跖草均能正常生长.随着铜离子浓度的增加,与对照组相比,铜离子浇灌的鸭跖草植株在前期生长较快,后期生长减慢.在前期各处理组的平均株高增加量随着浓度的升高而增加.经过不同浓度的铜离子浇灌处理后,各处理组鸭跖草叶片的超氧化物歧化酶(SOD)活性及脯氨酸含量逐渐增加.方差分析结果表明,不同浓度的铜离子处理对SOD酶的活性及脯氨酸的含量均没有产生显著的影响.不论地上部分还是地下部分,各处理组的生物量都表现为随铜离子浓度的升高而降低.由此可见,在重金属铜离子的胁迫下,鸭跖草对铜具有较强的耐性.通过体内提高SOD酶及脯氨酸的含量等生理响应来增加抵抗重金属铜胁迫的毒害作用.

The effects of copper stress on the growth and physiological characteristics for C. communis

Abstract: The effect of different concentrations Cu2+ on the growth and physiological characteristics for C. communis were studied by pot experiments in this article. Cu2+ concentration used for the experiments was 20,50,100,200,400mg/L, respectively, and the deionized water was control group.The results showed that C.communis watered by 5 different concentrations Cu2+ solution could grow normally. Comparing with the control group, C. communis grew quickly in the early period, but slowed down in the later period. With the increasing of Cu2+ concentration, the average height was increasing in the higher concentration. After various concentrations of Cu2+ treatment, SOD enzyme activities and proline contents of C. communis leaves were promoted gradually. Variance anlysis results showed that there were no significant difference among all treatments groups for SOD enzyme activities and proline contents. But the biomass of the upground and underground parts decreased with the increasing of Cu2+ concentration. This results indicated C.communis presented strong resistance to Cu2+ stress, which resisted heavy metal Cu2+ toxicity action through promoting the proline contents and SOD enzyme activities and the physiological response in the body