Water transport across plant tissue: Role of water channels

Steudle, Ernst

doi:10.1016/s0248-4900(97)83378-3

Cited by 36 publications

(38 citation statements)

References 71 publications

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“…How does cell specificity of MIP relate to vigor, growth of meristems, and developmental switches? Previous studies have viewed water relations in plants (assuming passive, pressure-driven movement) as a problem that can be solved by hydraulic equations (Steudle, 1997). However, the complexity of MIP location and amount in different cells indicates the requirement for cell-and tissue-specific, developmental, and environmental regulation of these proteins.…”

Section: Expression Of Aquaporins In Mesembryanthemum Crystallinummentioning

confidence: 99%

“…MIPs are called water channels or aquaporins once their ability to facilitate water flux has been demonstrated. Although their existence is irrefutable, conceptual reservations exist as to whether they are important conduits for water flux or minor players in plant water relations (Steudle, 1997;Tyerman et al, 1999). Information about the size of the Mip gene family, transcript expression, and the regulation of expression is available, but less is known about proteins and their dynamic behavior under normal conditions or conditions that force changes in water status.…”

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Expression of Water Channel Proteins in Mesembryanthemum crystallinum

et al. 2000

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We have characterized transcripts for nine major intrinsic proteins (MIPs), some of which function as water channels (aquaporins), from the ice plant Mesembryanthemum crystallinum. To determine the cellular distribution and expression of these MIPs, oligopeptide-based antibodies were generated against MIP-A, MIP-B, MIP-C, or MIP-F, which, according to sequence and functional characteristics, are located in the plasma membrane (PM) and tonoplast, respectively. MIPs were most abundant in cells involved in bulk water flow and solute flux. The tonoplast MIP-F was found in all cells, while signature cell types identified different PM-MIPs: MIP-A predominantly in phloem-associated cells, MIP-B in xylem parenchyma, and MIP-C in the epidermis and endodermis of immature roots. Membrane protein analysis confirmed MIP-F as tonoplast located. MIP-A and MIP-B were found in tonoplast fractions and also in fractions distinct from either the tonoplast or PM. MIP-C was most abundant but not exclusive to PM fractions, where it is expected based on its sequence signature. We suggest that within the cell, MIPs are mobile, which is similar to aquaporins cycling through animal endosomes. MIP cycling and the differential regulation of these proteins observed under conditions of salt stress may be fundamental for the control of tissue water flux.

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Section: Expression Of Aquaporins In Mesembryanthemum Crystallinummentioning

confidence: 99%

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confidence: 99%

Expression of Water Channel Proteins in Mesembryanthemum crystallinum

et al. 2000

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“…The use of Introduction It has been known for a long time that the hydraulic conductance of roots can be quite variable. It may depend on factors such as growth conditions and on the intensity of water¯ow (Brewig 1937;Brouwer 1954;Weatherley 1982;Passioura 1988;Steudle 1994Steudle , 1997Steudle and Peterson 1998). For example, roots grown under conditions of drought or high salinity oer a higher resistance to water¯ow than controls (Azaizeh et al 1992, Cruz et al 1992Stasovski and Peterson 1993;Nobel 1995, 1996).…”

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confidence: 99%

“…It has been proposed that the formation of an exodermis is related to stress conditions and that this structure plays an important role in reducing the hydraulic conductance of roots thus preventing them from an excessive water loss (Steudle 1994(Steudle , 1997Steudle and Frensch 1996;Steudle and Peterson 1998). It has been shown that the development of the exodermis will pass through similar states I to III as does the endodermis (Peterson 1988).…”

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Apoplastic transport across young maize roots: effect of the exodermis

Zimmermann

Steudle

1998

Planta

162

132

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Abbreviations and symbols: e r root surface area; g x Concentration in Xylem; D gas pneumatic pressure; t Ã sr rate of active solute (nutrient) uptake by the root; t Vr volume flow per unit root surface area; vp hydraulic conductivity of the root; vp r hydraulic conductivity; p x osmotic pressure of the xylem sap; p o osmotic pressure of the medium; PTS trisodium 3-hydroxy-5,8,10-pyrenetrisulfonate; Vr Volume flow per root; r e radius of endodermis; r r radius of root, r sr reflection coefficient of the root; V volume; Correspondence to: E. Steudle;

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“…Similar to the soybean hypocotyl, the cortex of the castor bean hypocotyl also consists of about 15 cell layers. If radial water flux follows the transcellular path across the cortex, a hydraulic limitation of this flux should be easily detectable in this multi-layer tissue because a series of hydraulic resistances (series of cell membranes; Steudle, 1997) will determine the overall hydraulic conductance of the hypocotyl cortex. In addition, a gradient in water potential between periphery and vascular tissue could cause apoplasmic tension resulting in water flux along the apoplasmic path (Boyer, 2001).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of aquaporins and water relations during hypocotyl elongation in Ricinus communis L. seedlings

Eisenbarth

Weig

2005

Journal of Experimental Botany

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The rate of water flow across biological membranes can be modulated by aquaporins which are expressed in many cells and tissues. The biological functions of these water channels in cellular processes have often been anticipated from the expression pattern, although the participation in the underlying process is not known in many cases. Ten putative aquaporin transcripts were identified in castor bean (Ricinus communis L.) seedlings and the water channel activity of three selected genes was analysed by heterologous expression in Xenopus oocytes, as well as the spatial and temporal expression by in situ hybridization/immunolocalization along the hypocotyl's axis. Water relations parameters were studied in elongating and non-elongating tissues using the cell pressure probe technique. These results indicate that (i) the amount of the RcPIP2-1 aquaporin correlated best with the elongation activity of the etiolated hypocotyl and (ii) the hydraulic conductivity of cortex cells is significantly higher in the elongating region of the hypocotyl compared with the nonelongating, mature region.

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Water transport across plant tissue: Role of water channels

Cited by 36 publications

References 71 publications

Expression of Water Channel Proteins in Mesembryanthemum crystallinum

Expression of Water Channel Proteins in Mesembryanthemum crystallinum

Apoplastic transport across young maize roots: effect of the exodermis

Dynamics of aquaporins and water relations during hypocotyl elongation in Ricinus communis L. seedlings

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