Effect of heavy metals on plasma membrane lipids and antioxidant enzymes of Zygophyl I urn species

Q3 Agricultural and Biological Sciences Eurasian Journal of Biosciences Pub Date : 2012-07-01 DOI:10.5053/EJOBIOS.2012.6.0.1
A. Morsy, K. Salama, H. A. Kamel, M. Mansour
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引用次数: 38

Abstract

Background: Heavy metals are major environmental pollutant when they present in high concentration in soil and have toxic effects on growth and development of plants. Industrial activities result in heavy metal pollution of large areas of land, which greatly affects natural vegetation. Understanding the mechanism of how plants combat heavy metals adverse effects is hence of great importance. Materials and Methods: Two different localities were chosen; one locality was in the vicinity of gypsum factory and the other one was 25 km away from the factory. Two Zygophyllum species (Z. album and Z. coccineum) were naturally grown in the studied areas. The effects of soil heavy metal stress on shoot heavy metal concentrations, lipid peroxidation, antioxidant enzyme activities and the root plasma membrane (PM) lipid composition were analyzed. Results: Heavy metal concentrations and Lipid peroxidation increased in the shoot of both species grown in the polluted area. The activities of ascorbate oxidase (ASO), guaiacal peroxidase (GPX), ascorbate peroxidase (APX) and superoxide dismutase (SOD) were increased whereas these of catalase (CAT) were decreased in both species under the polluted conditions. PM total lipids, phospholipids, glycolipids and sterols were decreased in Z. album and Z. coccineum as a result of the polluted soil. Heavy metal stress increased phosphatidylethanolamine (PE) and decreased phosphatidylinositol (PI) and phophatidylglycerol (PG), with no significant change in phosphatidylcholine (PC) in the root PM of both species. Phosphatidylserine (PS) decreased in the PM of Z. album whereas it increased in the PM of Z. coccineum under the pollution conditions. Heavy metal stress changed the composition and concentration of fatty acids of the root PM, resulting in increased sat/unsat ratio of both species. Conclusion: the results suggest that efficient antioxidant machinery and favorable PM lipid homeostasis are important to enable Zygophyllum species to withstand the prevailing heavy metal stress.
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重金属对赤藓属植物质膜脂和抗氧化酶的影响
背景:重金属是土壤中高浓度存在的主要环境污染物,对植物的生长发育具有毒性作用。工业活动造成大面积土地重金属污染,严重影响自然植被。因此,了解植物如何对抗重金属有害影响的机制是非常重要的。材料和方法:选择两个不同的部位;一处位于石膏厂附近,另一处距离石膏厂25公里。研究区自然生长两种刺槐属植物(Z. album和Z. coccineum)。分析了土壤重金属胁迫对幼苗地上部重金属浓度、脂质过氧化、抗氧化酶活性和根质膜脂质组成的影响。结果:在污染区内生长的两种植物的茎部重金属浓度和脂质过氧化水平均有所升高。污染条件下,两种植物抗坏血酸氧化酶(ASO)、愈创木醛过氧化物酶(GPX)、抗坏血酸过氧化物酶(APX)和超氧化物歧化酶(SOD)活性均升高,过氧化氢酶(CAT)活性降低。由于土壤污染,短尾竹和尾竹的总脂、磷脂、糖脂和甾醇含量降低。重金属胁迫提高了两种植物的磷脂酰乙醇胺(PE)含量,降低了磷脂酰肌醇(PI)和磷脂酰甘油(PG)含量,而磷脂酰胆碱(PC)含量变化不显著。磷脂酰丝氨酸(PS)在污染条件下呈下降趋势,而在尾骨草中呈上升趋势。重金属胁迫改变了根中脂肪酸的组成和浓度,导致两种植物的sat/unsat比值升高。结论:有效的抗氧化机制和良好的PM脂质稳态是竹叶属植物抵御重金属胁迫的重要因素。
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来源期刊
Eurasian Journal of Biosciences
Eurasian Journal of Biosciences Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
1.20
自引率
0.00%
发文量
0
期刊介绍: EurAsian Journal of BioSciences (Abbrev. Eurasia J Biosci or EJOBIOS) is an international, refereed electronic journal. It publishes the results of original research in the field of biological sciences restricted tomorphology, physiology, genetics, taxonomy, ecology and biogeography of both prokaryotic and eucaryotic organisms. The journal encourages submission of manuscripts dealing with plant biology, animal biology, plant physiology, microbiology, hydrobiology, ecology and environmental science, ethnobiology, biodiversity and conservation biology. EurAsian Journal of BioSciences publishes original articles in the following areas: -Agriculture, Fisheries & Food -Anatomy & Morphology -Behavioural Sciences -Biology, Biochemistry and Biotechnology -Biophysics -Biology Education -Cellular Biology and Anatomical Sciences -Ecology, Evolution & Environment -Entomology -Forestry -General Biology -Genetics & Heredity -Life Sciences - Other topics -Microbiology and Immunology -Molecular Biology -Mycology -Palaeontology -Parasitology -Pharmacology & Pharmacy -Physiology and Related Sciences -Plant Sciences -Toxicology -Veterinary Sciences -Virology -Zoology
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