Source:http://linkedlifedata.com/resource/pubmed/id/16664273
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3
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pubmed:dateCreated |
2010-6-29
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pubmed:abstractText |
K(+) and Na(+) fluxes and ion content have been studied in roots of Atriplex nummularia Lindl. and Avena sativa L. cv Goodfield grown in 3 millimolar K(+) with or without 3 or 50 millimolar NaCl. Compartmental analysis was carried out with entire root systems under steady-state conditions.Increasing ambient Na(+) concentrations from 0 to 50 millimolar altered K(+), in Atriplex, as follows: slightly decreased the cytoplasmic content (Q(c)), the vacuolar content (Q(v)), and the plasma membrane influx and efflux. Xylem transport for K(+) decreased by 63% in Atriplex. For oat roots, similar increases in Na(+) altered K(+) parameters as follows: plasma membrane influx and efflux decreased by about 80%. Q(c) decreased by 65%, and xylem transport decreased by 91%. No change, however, was observed in Q(v) for K(+). Increasing ambient Na(+) resulted in higher (3 to 5-fold) Na(+) fluxes across the plasma membrane and in Q(c) of both species. In Atriplex, Na(+) fluxes across the tonoplast and Q(v) increased as external Na(+) was increased. In oat, however, no significant change was observed in Na(+) flux across the tonoplast or in Q(v) as external Na(+) was increased. In oat roots, Na(+) reduced K(+) uptake markedly; in Atriplex, this was not as pronounced. However, even at high Na(+) levels, the influx transport system at the plasma membrane of both species preferred K(+) over Na(+).Based upon the Ussing-Teorell equation, it was concluded that active inward transport of K(+) occurred across the plasma membrane, and passive movement of K(+) occurred across the tonoplast in both species. Na(+), in oat roots, was actively pumped out of the cytoplasm to the exterior, whereas, in Atriplex, Na(+) was passively distributed between the free space, cytoplasm, and vacuole.
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-13587917,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16656483,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16656510,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16657527,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16659436,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16660671,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16660841,
http://linkedlifedata.com/resource/pubmed/commentcorrection/16664273-16662752
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pubmed:language |
eng
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pubmed:journal | |
pubmed:status |
PubMed-not-MEDLINE
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pubmed:month |
Jul
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pubmed:issn |
0032-0889
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
78
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
500-9
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pubmed:dateRevised |
2010-9-15
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pubmed:year |
1985
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pubmed:articleTitle |
Sodium and potassium fluxes and compartmentation in roots of atriplex and oat.
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pubmed:affiliation |
Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907.
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pubmed:publicationType |
Journal Article
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