Abstract：
:The effects of the heavy metals copper (Cu), zinc (Zn), and lead (Pb) on the chlorophyll content of two mosses Thuidium delicatulum (L.) Mitt. and T. sparsifolium (Mitt.) Jaeg., as well as leafy liverwort Ptychanthus striatus (Lehm. & Linderb.) were examined to understand the impact of metal accumulation on the chlorophyll content of mosses and leafy liverwort, which are found only in uncontaminated sites of the Kathmandu valley. These plants were treated with different concentrations of CuCl(2, )ZnCl(2), and Pb(NO(3))(2), ranging from 10(-10) M to 10(-2) M, in isolation and in combination under experimental conditions. Metal accumulation in the plant bodies increased with metal concentrations. Cu accumulation showed a significant inhibitory effect on chlorophyll-a, chlorophyll-b, and total chlorophyll in the mosses and the leafy liverwort. An insignificant decrease in chlorophyll content in both Thuidium species, but a significant decrease in leafy liverwort, was observed after Zn and Pb accumulation. Chlorophyll-a decreased significantly in T. sparsifolium; chlorophyll-b and total chlorophyll decreased significantly in T. delicatulum; and all chlorophyll contents decreased insignificantly in P. striatus after accumulation of Cu+Zn+Pb ions together from mixed metal solution. The ratio of chlorophyll-a to -b decreased more rapidly in both Thuidium species, with higher concentrations occurring when Cu+Zn+Pb ions were together than when Cu, Zn, or Pb ions were alone. This indicated a more destructive effect of Cu metals on the chlorophyll contents of both Thuidium species. High concentrations of Cu are known to activate oxidative damage and alter cell-membrane properties by lipid peroxidation, thereby demonstrating the inhibitory effect on the enzymes involved in chlorophyll production. The greater loss of chlorophyll from heavy-metal accumulation in P. striatus than in T. delicatulum and T. sparsifolium may have been caused by relatively more K(+) efflux in leafy liverwort than in the mosses, thus indicating their differences in membrane integrity.
journal_name
Arch Environ Contam Toxicoljournal_title
Archives of environmental contamination and toxicologyauthors
Shakya K,Chettri MK,Sawidis Tdoi
10.1007/s00244-007-9060-ysubject
Has Abstractpub_date
2008-04-01 00:00:00pages
412-21issue
3eissn
0090-4341issn
1432-0703journal_volume
54pub_type
杂志文章abstract：:From 1997 until 1999 the extent and the ecological effects of zinc, copper, lead, and cadmium pollution were studied in different reaches of the South American Pilcomayo River. A comparison of metal concentrations in water, sediment, and chironomid larvae, as well as the diversity of macroinvertebrate species, was mad...
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journal_title：Archives of environmental contamination and toxicology
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journal_title：Archives of environmental contamination and toxicology
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更新日期：2018-01-01 00:00:00
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更新日期：1975-01-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：1992-04-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：2010-02-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：1989-05-01 00:00:00
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更新日期：2007-11-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：1977-01-01 00:00:00
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更新日期：1999-07-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：2011-02-01 00:00:00
abstract：:Embryos of fathead minnows were more resistant to phenol, 2,4-dimethylphenol (2,4-DMP), 2,4-dichlorophenol (2,4-DCP), and pentachlorophenol (PCP) than were larval or juvenile life stages. Growth of 28-day-old fish was the most sensitive indicator of stress during exposures to phenol, 2,4-DMP, and PCP, whereas survival...
journal_title：Archives of environmental contamination and toxicology
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更新日期：1982-01-01 00:00:00
abstract：:Mussels are used as bioindicators of chemical pollution in coastal and estuarine waters. We measured the concentrations of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), phthalate esters (PEs), butyltins, and metals (Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, V, and Zn) in mussel tissues collected fro...
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更新日期：2010-08-01 00:00:00
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更新日期：2012-11-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：2011-04-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
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更新日期：1991-11-01 00:00:00
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journal_title：Archives of environmental contamination and toxicology
pub_type： 杂志文章
doi：10.1007/s00244-017-0413-x
更新日期：2017-10-01 00:00:00
