BIODEGRADABLE CHELATING AGENT ETHYLENEDIAMINEDISUCCINIC ACID REDUCES UPTAKE OF COPPER THROUGH ALLEVIATION OF COPPER TOXICITY IN HYDROPONICALLY GROWN CHRYSANTHEMUM CORONARIUM L

2007 ◽  
Vol 26 (4) ◽  
pp. 749 ◽  
Author(s):  
Lan Wei ◽  
Chunling Luo ◽  
Chunchun Wang ◽  
Xiangdong Li ◽  
Zhenguo Shen
Keyword(s):  
Copper Toxicity ◽  
Chelating Agent ◽  
Chrysanthemum Coronarium ◽  
Ethylenediaminedisuccinic Acid ◽  
Hydroponically Grown

scholarly journals The effect of pH on copper toxicity to hydroponically grown maize.

1981 ◽  
Vol 29 (3) ◽  
pp. 217-238 ◽  
Author(s):  
T.M. Lexmond ◽  
P.D.J. van der Vorm
Keyword(s):  
Root Growth ◽  
Toxic Effect ◽  
Copper Toxicity ◽  
Effect Of Ph ◽  
Cu Toxicity ◽  
Hydroponically Grown

The effect of pH on Cu toxicity in maize cv. Capella was studied in 3 sol. culture experiments of different design. Raising the pH intensified the toxic effect of Cu which reduced root growth and enhanced association of Cu2+ ions with physiologically essential sites in the roots when competition from protons was lowered. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Levels of induced free proline in chelated and unchelated hydroponically grown lettuce (Lactuca sativa L.)

2020 ◽  
Vol 12 (1) ◽  
pp. 439-442
Author(s):  
M.S. Dagari ◽  
M.S. Musa ◽  
F.M. Maude
Keyword(s):  
Plant Species ◽  
Lactuca Sativa ◽  
Adaptive Response ◽  
Free Proline ◽  
Constant Concentration ◽  
Adverse Conditions ◽  
Lactuca Sativa L ◽  
Hydroponic Solution ◽  
Ethylenediaminedisuccinic Acid ◽  
Hydroponically Grown

It is well described that under stress conditions many plant species accumulates proline as adaptive response to adverse conditions. In this study, eight weeks old Lactuca sativa L. seedlings were transplanted in nutrient solution containing various doses (0.000, 0.0025, 0.005, 0.0075, and 0.025mg/L) of Pb2+ and Cd2+ and constant concentration of EDDS (0.0025M).  The effects of these treatments of Pb2+, Cd2+, combination of Pb2+ + Cd2+and with or without EDDS (Ethylene  diamine disuccinate) were compared based on the level of stress induced to the seedlings. Free proline contents induced due to stress by uptake of Pb2+and Cd2+ were investigated in both unchelated and chelated treatment. The results obtained showed that the effect of increasing concentration of Pb2+ in hydroponic solution leads to decrease in the level of stress induced to the seedlings by EDDS while the lower the Cd2+ concentration in the hydroponic solution the more the level of stress induced by EDDS to the plant. The highest level of stress caused to the seedlings by unchelated and chelated Pb2+ solution are 68.294±5.642; 72.681±14.740 µmolg-1 respectively while that of Cd2+ are 28.962±8.703; 48.263±2.455 µmolg-1 respectively. From this, it is evident that Pb2+induced more stress to the plants than Cd2+ in the presence and absence of EDDS (p<0.05). Keywords: Proline, Ethylenediaminedisuccinic Acid (EDDS), Lead, Cadmium, Lettuce.

Long-Term Copper Toxicity on Scenedesmus quadricauda and Complexing Polypeptides

1995 ◽  
Vol 30 (2) ◽  
pp. 265-276 ◽  
Author(s):  
Denis Bussières ◽  
Raynald Côté ◽  
Clément Richard ◽  
Édith St-Pierre
Keyword(s):  
Heavy Metal ◽  
Sharp Increase ◽  
Copper Ions ◽  
Copper Toxicity ◽  
Scenedesmus Quadricauda ◽  
Continuous Exposure ◽  
Exponential Curve ◽  
Negative Exponential

Abstract Long-term copper toxicity has been demonstrated in Scenedesmus quadricauda. Upon continuous exposure to copper ions at 250 μg/L, the algae responded by a sharp increase in the synthesis of complexing polypeptides to chelate Cu. Complexing polypeptides gradually decreased, as observed by six sampling tests over 732 h, resembling to a negative exponential curve. This gradual diminution is considered to be a prime mechanism of acclimation or of adaptation to a heavy metal contaminated environment.

Effects of NTA on the Fate of Heavy Metals in Sediments

1993 ◽  
Vol 28 (8-9) ◽  
pp. 191-194 ◽  
Author(s):  
S. L. Lo ◽  
L. J. Huang
Keyword(s):  
Heavy Metals ◽  
Sodium Tripolyphosphate ◽  
Equilibrium Concentration ◽  
Chelating Agent ◽  
Metal Species ◽  
Pollution Problem ◽  
Trisodium Salt ◽  
Major Factors ◽  
Apparent Equilibrium ◽  
Degradation Time

Sodium tripolyphosphate (STPP), which is widely used as a builder in synthetic detergents, was found as one of the major factors of eutrophication in rivers and lakes. Many countries have used nitrilotriacetate (NTA) in detergents to replace STPP, but it induced another pollution problem. Because NTA is an effective chelating agent, it will dissolve heavy metals from the sediments and affect the fate of metal species in rivers. The purpose of this study is to investigate the effect of the mobilization of heavy metals from sediments by NTA. The experimental results indicated that NTA increases the mobilization of heavy metals as the shaking time increases and reaches an apparent equilibrium concentration after 24–48 hours. Typical results show that using 20mg/l of NTA and shaking time of 6 days, the fraction mobilized is about 8 to 15% for Cu, 1 to 7% for Zn, 7 to 10% for Pb, and 7 to 30% for Cd. Hardness of the water affects the formation of heavy metal-NTA complexes significantly. Biodegradation of the trisodium salt of NTA starts after 6–9 days with degradation time of the metal-NTA complexes decreasing in the order of Cu &gt; Cd &gt; Zn &gt; Pb &gt; Ca.

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