Navigation Links
Additive copper-zinc interaction affects toxic response in soybean
Date:11/10/2009

MADISON, WI, NOVEMBER 9, 2009 -- Agricultural soils accumulate trace metals, particularly copper and zinc, as a result of their presence in wastes (sewage biosolids and manures) and fungicides that are applied over long periods of time. Regulations and guidelines for tolerable concentrations of these potentially plant-toxic elements in soils are based on the assumption that the toxic effects of the metals are substantially independent and not additive. However, additivity would imply that soil tolerance limits for each metal must be adjusted to compensate for the presence of another metal. There has been very little experimental work to date to provide a basis for determining the degree to which copper-zinc interaction in soils is additive as defined by the toxicity response in crops.

Researchers at Cornell University have investigated the copper-zinc interaction in two soils with different textures, using soybean growth and metal uptake into leaves to evaluate both toxicity and availability of these metals to the plants. Soybean crops were grown in pots in the field in two successive years after allowing copper and zinc sulfate-amended soils to age in the field for one year prior to the first planting. Copper and zinc were added to individual soils to provide 0, 50,100, 200, and 400 mg/kg of each metal as well as every possible combination of addition levels of the two metals. The results from the study are published in the November-December issue of Journal of Environmental Quality.

Interactive effects of copper and zinc were observed both in the soil as well as in the soybean toxic response. In the soil, high copper had a strong effect on inhibiting zinc adsorption on soil particles, thereby causing zinc to be more easily extractable and available. Conversely, there was only a moderate interactive effect of zinc on copper adsorption, probably explained by the higher affinity of copper for soil adsorption sites, particularly those associated with organic matter.

The toxic effects of copper and zinc on soybean growth was found to be additive to a large degree, as measures of both extractable copper and zinc in the soils were needed to adequately explain the inhibition of plant growth over all treatments. However, the toxic effect of copper was stronger than that of zinc, possibly explained by the observed severe impact of copper on soybean root development. Soil texture had a marked influence on the degree of copper and zinc toxicity and availability to soybeans, consistent with numerous studies that have shown coarse-textured soils to be more susceptible to the toxic effects of heavy metals on crops.

The results from the study indicate that guidelines for tolerable upper limits of copper and zinc concentrations in soils are likely to require allowance for the presence of a second toxic metal at elevated concentrations, which could lower the tolerable limit for either copper or zinc. Furthermore, tolerable limits for copper and zinc in soils are likely to be lower in coarse-textured soils.


'/>"/>

Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Related biology news :

1. Common food additive found to increase risk and speed spread of lung cancer
2. Fowl soil additive breaks down crude oil
3. Interaction of just 2 genes governs coloration patterns in mice
4. Hidden interactions between predators and prey: evolution causes cryptic dynamics in ecology
5. Skin oil -- ozone interactions worsen air quality in airplanes
6. Keck Foundation funds study of biological interactions with nanomaterials
7. Odd protein interaction guides development of olfactory system
8. New technology illuminates protein interactions in living cells
9. Rong Li Lab reports protein interactions of MAP kinase signaling pathway
10. New Argonne study may shed light on protein-drug interactions
11. Stowers Proteomics Center devises method for assigning probabilities to human protein interactions
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2017)... and ITHACA, N.Y. , June 23, ... University, a leader in dairy research, today announced a ... to help reduce the chances that the global milk ... of this dairy project, Cornell University has become the ... the Food Supply Chain, a food safety initiative that ...
(Date:5/23/2017)... 2017  Hunova, the first robotic gym for the rehabilitation and functional ... in Genoa, Italy . The first 30 robots will ... USA . The technology was developed and patented at ... IIT spin-off Movendo Technology thanks to a 10 million euro investment from ... click: ...
(Date:5/16/2017)... 16, 2017   Bridge Patient Portal , ... MD EMR Systems , an electronic medical ... GE, have established a partnership to build an ... the GE Centricity™ products, including Centricity Practice Solution ... These new integrations will allow healthcare delivery ...
Breaking Biology News(10 mins):
(Date:8/16/2017)... Ca (PRWEB) , ... August 16, 2017 , ... ... by changing into a different cell type. Many treatments for specific cancers, such ... prominent example of targeted treatment is androgen deprivation therapy for advanced prostate cancer. ...
(Date:8/16/2017)... OH (PRWEB) , ... August 16, 2017 , ... ... a beneficial microbe delivery system, announced it has secured $2M in funding from ... Queen City Angels, Carmen Innovations, and SVG Thrive Fund. With this investment, 3Bar ...
(Date:8/16/2017)... of the Inc. 5000 features a now-familiar name: BioPoint ( http://biopointinc.com/ ), ... for the third year in a row. Now in its 36th edition, ... set of quantitative metrics. In addition, BioPoint was also named to the ... Bay State . ... ...
(Date:8/15/2017)... STANFORD, Calif. , Aug. 15, 2017 After spending ... resources and support with crowdsourced data collection, GeneFo now offers this ... interested in aligning and amplifying support, adherence, and data collection vis ... with medical foundations mark the successful launch of this offer. ... GeneFo ...
Breaking Biology Technology: