共查询到18条相似文献，搜索用时 218 毫秒
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大量研究表明植物细胞遭受重金属胁迫后其超微结构会发生不同程度的损伤。主要表现在，高尔基体、内质网、细胞核、叶绿体、线粒体、液泡、质膜等的异常变化．并且植物受胁迫时间越长．重金属离子浓度越高．超微结构的损伤越呈加重趋势．本文综述了重金属对植物细胞超微结构的毒害效应。旨在探讨植物受重金属毒害后其细胞超微结构的变化规律．为植物的重金属毒害机理提供细胞学证据． 相似文献
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水生植物受重金属污染毒害的相关研究 总被引：5，自引：0，他引：5
重点介绍了重金属污染对水生植物毒害的研究内容及相应研究方法；分析了重金属污染对水生植物毒害的生理效应；概括了重金属污染对水生植物毒害的机理。 相似文献
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重金属的排放造成了严重的环境问题。而消除重金属污染成为世界性的难题．有关研究结果表明。虽然重金属污染对植物有毒害作用，但是某些特殊植物具有从污染环境中吸收、转移以及积累重金属的潜能。从而修复土壤和水体等环境中的重金属污染．植物修复技术的出现虽然有很好的应用前景，但仍存在一些问题。 相似文献
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概述了植物对重金属耐受性的研究概况,介绍重金属污染对高等植物生长、发育的影响,以及高等植物重金属耐受性的分子机理和耐受性相关基因的克隆与表达以及如何利用抗重金属的植物资源治理污染,培育绿色产品的研究成果. 相似文献
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土壤重金属污染及植物修复 总被引：1，自引：0，他引：1
论述了土壤重金属污染的现状,从土壤重金属对土壤微生物和土壤酶以及对农作物等方面的危害进行了阐述;对超富集植物的概念与特征和重金属污染土壤的植物修复机理也进行了讨论. 相似文献
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蔡深文 《遵义师范学院学报》2015,(1):106-110
金属型植物能够在重金属污染严重的土壤中生存和繁殖,一方面可以通过避性机制减少对环境中重金属的吸收,另一方面通过耐性机制,如细胞壁结合、区室化作用、螯合作用和抗氧化机制减小过量蓄积在体内的重金属产生的毒害作用。金属型植物是植物修复土壤重金属污染的理想材料。深入研究金属型植物的抗性机制,可为重金属污染地区的植被恢复和生态恢复提供理论依据,对于土壤重金属污染的治理将起到十分重要的作用。 相似文献
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重金属污染对环境以及人体有严重影响,同时也是目前危害最大的水污染问题之一.介绍藻菌生物膜及胞外聚合物的特点及其对废水中重金属的处理现状及机理.传统方法在当今社会的局限性越发明显,利用藻菌生物膜法处理重金属废水的优势越发明显. 相似文献
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Essa Ali Nazim Hussain Imran Haider Shamsi Zahra Jabeen Muzammil Hussain Siddiqui Li-xi Jiang 《Journal of Zhejiang University. Science. B》2018,19(2):130-146
The well-known detrimental effects of cadmium (Cd) on plants are chloroplast destruction, photosynthetic pigment inhibition, imbalance of essential plant nutrients, and membrane damage. Jasmonic acid (JA) is an alleviator against different stresses such as salinity and drought. However, the functional attributes of JA in plants such as the interactive effects of JA application and Cd on rapeseed in response to heavy metal stress remain unclear. JA at 50 μmol/L was observed in literature to have senescence effects in plants. In the present study, 25 μmol/L JA is observed to be a “stress ameliorating molecule” by improving the tolerance of rapeseed plants to Cd toxicity. JA reduces the Cd uptake in the leaves, thereby reducing membrane damage and malondialdehyde content and increasing the essential nutrient uptake. Furthermore, JA shields the chloroplast against the damaging effects of Cd, thereby increasing gas exchange and photosynthetic pigments. Moreover, JA modulates the antioxidant enzyme activity to strengthen the internal defense system. Our results demonstrate the function of JA in alleviating Cd toxicity and its underlying mechanism. Moreover, JA attenuates the damage of Cd to plants. This study enriches our knowledge regarding the use of and protection provided by JA in Cd stress. 相似文献
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植物金属硫蛋白在植物体内转运重金属并解除其毒性;转运必需微量金属作为金属供体,调节微量必需金属的体内稳态或金属库;还参与植物的多种胁迫抗性的形成和活性氧清除,对调节植物胞内氧化还原状态起到信号的作用;植物金属硫蛋白还受植物激素的调控,在植物的形态构建中发挥重要作用.因此植物金属硫蛋白是植物抗逆过程中的重要信号,具有重要的生理功能. 相似文献
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巴夫金藻耐受Cu~(2+)、Cd~(2+)毒害作用的研究 总被引：5，自引：0，他引：5
[目的]研究单胞藻对重金属离子毒害的耐受性,为生物去污提供依据。[方法]分别用不同浓度(c=1～150mg/L)Cu~(2+)、Cd~(2+)处理巴夫金藻(Monochrysis lutheri),观察了重金属离子对其生长的影响;用微量减压法研究毒害抑制呼吸作用;用ICP法研究毒害抑制下重金属离子的富集。[结果]①2种离子的毒性强度的顺序为Cu~(2+)>Cd~(2+);②Cu~(2+)对生长的抑制较强,其EC_(50)(72h)为15.0mg/L;Cd~(2+)对生长的抑制较弱,其EC_(50)(72h)为75mg/L;③在EC_(50)毒害浓度下,毒害组均提前进入生长静止期,缩短了种群生长周期;呼吸作用先增强后降低;④在EC_(50)毒害浓度下,单胞藻对Cu~(2+)的富集量为6866.1mg·kg~(-1),对Cd~(2+)的富集量678.25mg·kg~(-1)。[结论]巴夫金藻具有较强的耐受重金属离子毒害能力,耐受顺序为Cd~(2+)相似文献
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Heavy metal pollution of soil is a significant environmental problem and has its negative impact on human health and agriculture. Rhizosphere, as an important interface of soil and plant, plays a significant role in phytoremediation of contaminated soil by heavy metals, in which, microbial populations are known to affect heavy metal mobility and availability to the plant through release of chelating agents, acidification, phosphate solubilization and redox changes, and therefore, have potential to enhance phytoremediation processes. Phytoremediation strategies with appropriate heavy metal-adapted rhizobacteria have received more and more attention. This article paper reviews some recent advances in effect and significance of rhizobacteria in phytoremediation of heavy metal contaminated soils. There is also a need to improve our understanding of the mechanisms involved in the transfer and mobilization of heavy metals by rhizobacteria and to conduct research on the selection of microbial isolates from rhizosphere of plants growing on heavy metal contaminated soils for specific restoration programmes. 相似文献
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Heavy metal pollution of soil is a significant environmental problem and has its negative impact on human health and agriculture. Rhizosphere, as an important interface of soil and plant, plays a significant role in phytoremediation of contaminated soil by heavy metals, in which, microbial populations are known to affect heavy metal mobility and availability to the plant through release of chelating agents, acidification, phosphate solubilization and redox changes, and therefore, have potential to enhance phytoremediation processes. Phytoremediation strategies with appropriate heavy metal-adapted rhizobacteria have re-ceived more and more attention. This article paper reviews some recent advances in effect and significance of rhizobacteria in phytoremediation of heavy metal contaminated soils. There is also a need to improve our understanding of the mechanisms in-volved in the transfer and mobilization of heavy metals by rhizobacteria and to conduct research on the selection of microbial isolates from rhizosphere of plants growing on heavy metal contaminated soils for specific restoration programmes. 相似文献
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P1B型ATPase重金属转运蛋白（HMA）广泛存在于低等植物和高等植物中,参与植物生长发育过程中所必需的微量金属营养元素的运输.与双子叶植物拟南芥（Arabidopsis thaliana）AtHMA1-8的大量研究相比,单子叶植物中HMA转运蛋白的相关功能与研究极其有限.根据已有的研究成果对水稻（Oryza sativa L.）体内9种HMA转运蛋白的分类、结构、分子机制与转运功能进行了详细对比和归纳,对这些重金属转运蛋白在植物中的组织分布、亚细胞定位和金属特异性进行了阐述,推测了目前尚未明确功能的OsHMA1、OsHMA4、OsH-MA6、OsHMA7和OsHMA8的亚细胞定位及潜在的转运功能,以期为未来进一步的科学研究提供更多依据. 相似文献
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INTRODUCTION Regulation, handling and bioremediation of hazardous materials require an assessment of the risk to some living species other than human being, or assessment of hazard to the entire ecosystem. As- sessment endpoints are values of the ecosystem that are to be protected and are identified early in the analysis. Such endpoints may include life cycle stages of a species and reproductive or growth patterns. Ecosystem risk assessment is at its dawn with this area of environment sci… 相似文献
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唐建勋 《金华职业技术学院学报》2007,7(6):18-21
本文分析和讨论了水环境中重金属的污染特征、重金属在水生动植物体内的蓄积和对水生动植物的毒害作用,综述了重金属污染水体对水生生物生长、发育和繁衍等生命活动的危害和影响。 相似文献