【摘 要】
：
为探索植物对重金属的修复作用以及自身对重金属污染的生理效应,以基质盆栽高羊茅(Festuca arundinacea)幼苗为试验材料,比较分析了不同铅胁迫下,高羊茅的生理生化效应.结果
【机 构】
：
山西农业大学农学院,天津农学院园艺园林学院,天津农学院农学系
论文部分内容阅读
为探索植物对重金属的修复作用以及自身对重金属污染的生理效应,以基质盆栽高羊茅(Festuca arundinacea)幼苗为试验材料,比较分析了不同铅胁迫下,高羊茅的生理生化效应.结果表明:随着胁迫时间的延长,不同铅浓度下的高羊茅叶片中超氧化物歧化酶(SOD)和过氧化物酶(POD)活性整体变化为先升后降,POD变化趋势较为缓慢,表明低浓度或短时间内铅可快速诱导高羊茅保护酶活性.叶绿素总量变化为低浓度(500,1000mg·L-1)下先增加后下降,高浓度下则为持续下降,表明高羊茅可能通过增加叶绿素来适应低铅胁迫,而高浓度下则失去了这种调节能力.3个铅浓度下的丙二醛(MDA)含量与胁迫时间及胁迫浓度均为正相关,表明随着胁迫浓度和时间的增加,细胞膜脂过氧化作用加强.脯氨酸含量在500,1000mg·L-1铅浓度下随时间增加为先降后升,1500 mg·L-1浓度下则相反,但均高于对照,表明经铅胁迫后细胞的渗透调节能力增强.3个浓度下的可溶性糖含量变化均随时间表现出降-升-降,最终显著降低,整个变化过程低于对照.因此在铅胁迫过程中,这些生理特性的变化表明在低铅胁迫时高羊茅表现为积极适应和抵抗,而在高铅胁迫下则表现为忍耐和受损.
其他文献
A root-bag experiment was conducted to study the effects of insoluble Zn, Cd and ethylenediaminetetraacetic acid (EDTA) on the plant growth, activities of antio
A field microplot experiment was conducted in the red soil hilly region of South China to evaluate plant phosphorus (P) uptake under soybean and citrus monocult
Carbendazim, a systemic benzimidazole fungicide, is applied repeatedly to control of plant diseases including soilborne diseases, over a growing season. Studies
Current understanding of the classical ABC model of floral development has provided a new set of characters to evaluate floral evolution. However, what is still
Simultaneous determination of epinephrine(EP)and dopamine(DA)at 2,3-dimercaptosuccimc acid(DMSA)modified electrode was studied.The oxidation peaks of the mixtur
The lipH2 gene, encoding the expression of lignin peroxidase, was cloned from Phanerochaete chrysosporium BKM-F-1767 and expressed in Pichia pastoris X-33, a ye
Polymerase chain reaction (PCR) - denaturing gradient gel electrophoresis (DGGE) protocol was employed for revealing microbial community structure and successio
Enhanced Cd uptake and Zn depletion in rice grains and high potential for food Cd exposure by the high-yielding hybrid cultivars had been addressed.A field expe
In order to build a model for the Chang-8 low permeability sandstone reservoir in the Yanchang formation of the Xifeng oil field, we studied sedlimentation and
根据2009-04-2010-02隔月6个航次桑沟湾9个调查站位贝类养殖区有机氯(OCPs)、有机磷(OPPs)农药残留和麻痹性贝毒(PSP)的调查资料,分析了它们在该海域海水中、表层沉积物中和