Abstract：
:The purpose of the present work was to study the effect of the nitrogen source (NO3- vs NH4+) on cadmium (Cd) uptake, translocation and partition and its associated toxicity in hydroponically-grown Arabidopsis plants. After a short growth period on a complete Hoagland nutrient solution, Arabidopsis seedlings continued in the same growth medium (NA) or were switched to NO3- (N) or NH4+ (A) as sole N sources and supplied with 2.5 μM Cd. Unrelated to the nitrogen source, Cd reached higher levels in roots than in leaves. However, when ammonium was the source of nitrogen, Cd accumulation in roots was lower than in N or NA medium and the metal translocation to the aerial part was restricted, reaching values 25%-35% below the levels observed in plants grown with N or NA. Cadmium negatively affected chlorophyll content and PSII quantum yield, independently of the nitrogen source, with the highest decrease (35%) under NA treatment. Proline content increased, either with NA, N or A supplied in the presence of Cd, whereas a rise in total anthocyanin content was clearly favored when ammonium was the source of nitrogen, with or without Cd. In leaves, while NIA1 and NIA2 expression was markedly reduced by Cd in the presence of N or NA, ammonium source slightly reduced NIA1 expression but greatly upregulated NIA2 expression upon Cd exposure. The decay in NR activity was independent of the nitrogen source when Cd was applied and this decay was accompanied by a great increase in NH4+ levels either with nitrates or ammonium in the medium in the presence of Cd. Only NIA1 was detected in roots and its expression, together with NR activity and nitrates levels, was the highest in N medium devoid of Cd. The possibility of reducing Cd health risks through nitrogen fertilization practices is discussed.
journal_name
Ecotoxicol Environ Safjournal_title
Ecotoxicology and environmental safetyauthors
Vazquez A,Recalde L,Cabrera A,Groppa MD,Benavides MPdoi
10.1016/j.ecoenv.2020.110163subject
Has Abstractpub_date
2020-03-15 00:00:00pages
110163eissn
0147-6513issn
1090-2414pii
S0147-6513(20)30002-6journal_volume
191pub_type
杂志文章abstract：:Corpse-removal behavior of the red imported fire ant (RIFA) and the effects of lethal substances on RIFA signal communication were investigated in this study. The RIFA corpses, obtained through freezing, ether, 0.25 mg/L thiamethoxam, and starvation to death treatments, and naturally dead red fire ants were subjected ...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2020.110391
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abstract：:Toxicity to the locally dominant amphipod Hyalella curvispina was assessed in a first-order stream running through a cultivated farm. Cypermethrin, chlorpyrifos, endosulfan and glyphosate were sprayed throughout the studied period. Toxicity was assayed under controlled laboratory conditions with runoff and stream wate...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2010.07.030
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abstract：:The effects of 1.5 ppm of mercuric chloride (LC50/48 hr) on some enzymes and organic substances of liver tissue of Sarotherodon mossambicus were studied. Significant decreases in the activities of succinate dehydrogenases, lactate dehydrogenases, glucose-6-phosphate dehydrogenase, alkaline phosphatase, and acid phosph...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/0147-6513(84)90024-1
更新日期：1984-06-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/s0147-6513(02)00030-1
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abstract：:Sea chub, Girella laevifrons, is a coastal fish that inhabits high intertidal rockpools along the coast of Chile. The intertidal pools where the juveniles live, are an extreme environment with high levels of ultraviolet (UV) radiation, becoming harmful to the organisms, due to oxidative stress generated by reactive ox...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2013.07.030
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2020.110816
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2007.02.007
更新日期：2008-01-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2015.03.028
更新日期：2015-11-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/0147-6513(91)90019-l
更新日期：1991-04-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2015.06.012
更新日期：2015-10-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2014.04.009
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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更新日期：1990-10-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2020.110869
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2018.01.059
更新日期：2018-05-30 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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更新日期：2019-01-15 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2018.06.045
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/S0147-6513(03)00109-X
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2012.09.017
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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journal_title：Ecotoxicology and environmental safety
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1006/eesa.1996.1486
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2019.109929
更新日期：2020-02-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1016/j.ecoenv.2018.10.079
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journal_title：Ecotoxicology and environmental safety
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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journal_title：Ecotoxicology and environmental safety
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更新日期：2021-01-01 00:00:00
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journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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abstract：:Sodium perchlorate (NaClO4) and exogenous L-thyroxine (T4), two kinds of endocrine-disrupting chemicals (EDCs), mainly affect the circulating thyroid hormones, which regulate the initiation and rate of metamorphosis in amphibian. The aim of this study is to evaluate the potential role of EDCs in regulating the develop...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
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更新日期：2020-12-15 00:00:00
abstract：:The continuous culture of fresh green algae for use as food for Daphnia magna in toxicity tests is labor intensive. The possibility of using freeze-dried Chlorella vulgaris as an off-the-shelf food was investigated. The performance of D. magna provided with freeze-dried food was investigated over several generations a...
journal_title：Ecotoxicology and environmental safety
pub_type： 杂志文章
doi：10.1006/eesa.1993.1015
更新日期：1993-04-01 00:00:00
