Linked Life Data

21538487

Source:http://linkedlifedata.com/resource/pubmed/id/21538487

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
8
pubmed:dateCreated
2011-7-7
pubmed:abstractText
Metal phytotoxicity is important in both environmental and agricultural systems. A solution culture study examined the toxicity of 26 metals to roots of cowpea (Vigna unguiculata (L.) Walp.); new data were collected for 15 metals and published data for 11 metals. Metal toxicity, calculated as causing a 50% reduction in root elongation rate, was determined based on either the measured concentration in the bulk solution (EC50(b)) or the calculated activity at the outer surface of the plasma membrane (EA50(0)°). The EC50(b) values ranged from 0.007?µM for Tl to 98,000?µM for K, with the order of rhizotoxicity to cowpea, from most to least toxic, being Tl?=?Ag?>?Cu?>?Hg?=?Ni?=?Ga?=?Ru?=?In?>?Sc?=?Cd?=?Gd?=?La?=?Co?=?Cs?=?Pb?>?Zn?=?Al?=?H?>?Mn?>?Ba?=?Sr?>?Li?>?Mg?>?Ca?=?Na?>?K. The EA50(0)° values suggest that the binding of metals to hard ligands is an important, general, nonspecific mechanism of toxicity, a hypothesis supported by the similar toxicity symptoms to roots of cowpea by many metals. However, additional mechanisms, such as strong binding to soft ligands, substantially increase rhizotoxicity of some metals, especially Tl, Ag, and Cs. Besides direct toxic effects, osmotic effects or reduced activity of Ca(2+) at the outer surface of the root plasma membrane (and resultant Ca deficiency) may decrease short-term root growth.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1552-8618
pubmed:author
pubmed:copyrightInfo
Copyright © 2011 SETAC.
pubmed:issnType
Electronic
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1827-33
pubmed:meshHeading
pubmed:year
2011
pubmed:articleTitle
Toxicity of metals to roots of cowpea in relation to their binding strength.
pubmed:affiliation
The University of Queensland, School of Agriculture and Food Sciences, St. Lucia, Queensland, Australia. p.kopittke@uq.edu.au
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't