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• W2158162775 startingPage "1642" @default.
• W2158162775 abstract "The concentration of cations in the xylem sap influences the rate of xylem water flow in angiosperm plants. It has been speculated that this is due to the shrinking and swelling of pectins in the pit membranes. However, there is as yet minimal evidence for the presence of pectin in pit membranes of angiosperms. The little pectin that has been found at the pit membrane edges of some species might not be adequate to explain the swelling and shrinking phenomena. The presence of hemicelluloses is also not certain. Lignin, by contrast, seems to be sometimes present, apart from cellulose, which is the main component. An alternative hypothesis is formulated, which involves the shrinking of any polyelectrolyte polymers in the pit membrane and a change in volume of the mobile phase in the pit pores. These phenomena are the result of electrostatic events. Some pit membrane polymers are negatively charged because of proton dissociation from functional groups. This charge is compensated by cations in the aqueous phase, which form a diffuse double layer (DDL). Inside the pit pores, an increase of the electrolyte concentration in the xylem sap will reduce the extent of the DDL. This will result in an increase in water flow. Additional flow enhancement, upon increase of the cation concentration, can be due to shrinkage of all membrane polymers. This contraction will also lead to an increase of the pit pore diameter. These processes will only be partly counteracted by forces that decrease the diameter of the pit pore due to relaxation." @default.
• W2158162775 created "2016-06-24" @default.
• W2158162775 creator A5029773031 @default.
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• W2158162775 date "2011-10-24" @default.
• W2158162775 modified "2023-09-24" @default.
• W2158162775 title "Hydrogel Regulation of Xylem Water Flow: An Alternative Hypothesis: Figure 1." @default.
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• W2158162775 doi "https://doi.org/10.1104/pp.111.185314" @default.
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• W2158162775 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22025608" @default.
• W2158162775 hasPublicationYear "2011" @default.
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