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פותח על ידי קלירמאש פתרונות בע"מ -
Computation of surface electrical potentials of plant cell membranes: Correspondence to published zeta potentials from diverse plant sources
Year:
1998
Authors :
ירמיהו, אורי
;
.
Volume :
118
Co-Authors:
Kinraide, T.B., Appalachian Soil/Water Conserv. R.L., Agricultural Research Service, U. States Department of Agriculture, Beaver, WV 25813-0400, United States
Yermiyahu, U., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet-Dagan 50250, Israel
Rytwo, G., Tel Hai College, Upper Galilee 12210, Israel
Facilitators :
From page:
505
To page:
512
(
Total pages:
8
)
Abstract:
A Gouy-Chapman-Stern model has been developed for the compulation of surface electrical potential (ψ0) of plant cell membranes in response to ionic solutes. The present model is a modification of an earlier version developed to compute the Sorption of ions by wheat (Triticum aestivum L. cv Scout 66) root plasma membranes. A single set of model parameters generates values for ψ0 that correlate highly with published ζ potentials of protoplasts and plasma membrane vesicles from diverse plant sources. The model assumes ion binding to a negatively charged site (R- = 0.3074 μtmol m-2) and to a neutral site (P0 = 2.4 μmol m-2) according to the reactions R- + Iz ⇌ RIz~' and P0 + Iz ⇌ PIz, where Iz represents an ion of charge Z. Binding constants for the negative site are 21,500 M-1 for H+, 20,000 M-1 for Al3+, 2,200 M-1 for La3+, 30 M-1 for Ca2+ and Mg2+, and 1 M-1 for Na+ and K+. Binding constants for the neutral site are 1/180 the value for binding to the negative site. Ion activities at the membrane surface, computed on the basis of ψ0, appear to determine many aspects of plant-mineral interactions, including mineral nutrition and the induction and alleviation of mineral toxicities, according to previous and ongoing studies. A computer program with instructions for the computation of ψ0, ion binding, ion concentrations, and ion activities at membrane surfaces may be requested from the authors.
Note:
Related Files :
Biochemistry
Membranes
Plant Cell
plant physiology
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23246
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:57
Scientific Publication
Computation of surface electrical potentials of plant cell membranes: Correspondence to published zeta potentials from diverse plant sources
118
Kinraide, T.B., Appalachian Soil/Water Conserv. R.L., Agricultural Research Service, U. States Department of Agriculture, Beaver, WV 25813-0400, United States
Yermiyahu, U., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet-Dagan 50250, Israel
Rytwo, G., Tel Hai College, Upper Galilee 12210, Israel
Computation of surface electrical potentials of plant cell membranes: Correspondence to published zeta potentials from diverse plant sources
A Gouy-Chapman-Stern model has been developed for the compulation of surface electrical potential (ψ0) of plant cell membranes in response to ionic solutes. The present model is a modification of an earlier version developed to compute the Sorption of ions by wheat (Triticum aestivum L. cv Scout 66) root plasma membranes. A single set of model parameters generates values for ψ0 that correlate highly with published ζ potentials of protoplasts and plasma membrane vesicles from diverse plant sources. The model assumes ion binding to a negatively charged site (R- = 0.3074 μtmol m-2) and to a neutral site (P0 = 2.4 μmol m-2) according to the reactions R- + Iz ⇌ RIz~' and P0 + Iz ⇌ PIz, where Iz represents an ion of charge Z. Binding constants for the negative site are 21,500 M-1 for H+, 20,000 M-1 for Al3+, 2,200 M-1 for La3+, 30 M-1 for Ca2+ and Mg2+, and 1 M-1 for Na+ and K+. Binding constants for the neutral site are 1/180 the value for binding to the negative site. Ion activities at the membrane surface, computed on the basis of ψ0, appear to determine many aspects of plant-mineral interactions, including mineral nutrition and the induction and alleviation of mineral toxicities, according to previous and ongoing studies. A computer program with instructions for the computation of ψ0, ion binding, ion concentrations, and ion activities at membrane surfaces may be requested from the authors.
Scientific Publication
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