Profiles of Chloride Concentration and PD in the Root of<i>Commelina communis</i>L.

Kelday, L. S.; Bowling, D. J. F.

doi:10.1093/jxb/31.5.1347

Cited by 13 publications

(3 citation statements)

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“…The significant radial gradients reported here for low-nutrient-grown plants are in contrast to the absence of gradients of C1-across the roots of Commelina communis (Kelday and Bowling, 1980) using a similar sampling system and of K + in maize, sunflower and rye-grass by various authors (see refs in Kelday and Bowling, 1980) using microelectrodes.…”

Section: Pathways Of Solute Migrationcontrasting

confidence: 50%

Turgor-regulation during extension growth and osmotic stress of maize roots. An example of single-cell mapping

Pritchard¹,

Fricke²,

Tomos³

1996

Plant Soil

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J e r e m y P r i t c h a r d 1, W i e l a n d F r i c k e 2 a n d D e r i Y o m o s 1,3 AbstractThe growing cells of hydroponic maize roots expand at constant turgor pressure (0.48 MPa) both when grown in low-(0.5 mol m -3 CaC12) or full-nutrient (Hoagland's) solution and also when seedlings are stressed osmotically (0.96 MPa mannitol). Cell osmotic pressure decreases by 0.1-0.2 MPa during expansion. Despite this, total solute influx largely matches the continuously-varying volume expansion-rate of each cell. K + in the non-osmotically stressed roots is a significant exception -its concentration dropping by 50% regardless of the presence or absence of K + in the nutrient medium. This corresponds to the drop in osmotic pressure. Nitrate appears to replace C1-in the Hoagland-grown cells.Analogous insensitivity of solute gradients to external solutes is observed in the radial distribution of water and solutes in the cortex 12 mm from the tip. Uniform turgor and osmotic pressures are accompanied by opposite gradients of K + and CI-, outwards, and hexoses and amino acids, inwards, for plants grown in either 0.5 mol m -3 CaC12 or Hoagland's solution (with negligible C1-). K + and C1-levels within both gradients were slightly higher when the ions were available in the medium. The gradients themselves are independent of the direction of solute supply. In CaC12 solution all other nutrients must come from the stele, in Hoagland's solution inorganic solutes are available in the medium. 24 h after osmotic stress, turgor pressure is recovered at all points in each gradient by osmotic adjustment using organic solutes. Remarkably, K + and C1-levels hardly change, despite their ready availability. Hexoses are responsible for some 50% of the adjustment with mannitol for a further 30%. Some 20% of the final osmotic pressure remains to be accounted for. Proline and sucrose are not significantly involved. Under all conditions a standing water potential step of 0.2 MPa between the rhizodermis and its hydroponic medium was found. We suggest that this is due to solute leakage.Abbreviations: EDX -energy dispersive X-ray microanalysis; u? _ water potential; 7ri -cell osmotic pressure; Pturgor pressure.

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Section: Pathways Of Solute Migrationcontrasting

confidence: 50%

Turgor-regulation during extension growth and osmotic stress of maize roots. An example of single-cell mapping

Pritchard¹,

Fricke²,

Tomos³

1996

Plant Soil

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“…In subapical regions of the root, vacuolar Cl – concentrations were higher and mostly uniform across the cortex. Relatively uniform patterns of Cl – accumulation across roots have been noted for rice (Zheng & Yan 1996) and Commelina communis (Kelday & Bowling 1980). The concentration of Cl – accumulated in isolated root cortex of Zea mays was not proportional to the external KCl or to the Cl – influx into fresh tissue (Cram 1973), indicative of homeostatic regulation of Cl – transport.…”

Section: Discussionmentioning

confidence: 92%

Root structure and cellular chloride, sodium and potassium distribution in salinized grapevines

Storey

Schachtman

Thomas³

2003

Plant Cell & Environment

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X-ray microanalysis was used to study the patterns of K + + + + , Na + + + + and Cl -accumulation in salinized (25 m M NaCl) and non-salinized grapevine ( Vitis ) roots. The aim was to determine whether NaCl affects patterns of Cl -accumulation differentially in the roots of a Cl --excluding genotype and a non-excluding genotype. Two regions of fibrous roots were analysed: (1) a region 2-3 mm basipetal to the root tip; and (2) a region of the root 10-12 mm basipetal to the root tip where the outermost layer is the hypodermis. The ion contents of the hypodermis, cortex, endodermis and pericycle vacuoles were analysed. Data were also collected from the cytoplasm of the endodermal and pericycle cells. The analyses showed that the ion profiles of the hypodermis and the endodermis were significantly different from those of the cortex and pericycle. The hypodermis and endodermis had higher K + + + + and lower Na + + + + and Cl -than surrounding cells. Some changes due to salinity such as increased K + + + + concentrations in the hypodermis were also noted. Chloride concentrations did not differ between the genotypes in the hypodermis, across the cortex or in the endodermis, but were higher in the pericycle of the excluder in comparison with the non-excluding genotype. However, K + + + + /Na + + + + ratios of the cortex and endodermis were higher in the excluder. The pericycle cells exhibited the greatest ability to sequester Na + + + + and Cl -in vacuoles. Overall the data show cell-type-specific ion accumulation patterns and small but significant differences were found between genotypes. The possibility that these accumulation patterns arise from differences in uptake properties of cell types and/or result from the spatial distribution of the cell types along the competing symplastic and apoplastic ion transport pathways across the root is discussed.

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“…In subapical regions of the root, vacuolar Clconcentrations were higher and mostly uniform across the cortex. Relatively uniform patterns of Claccumulation across roots have been noted for rice (Zheng & Yan 1996) and Commelina communis (Kelday & Bowling 1980). The concentration of Claccumulated in isolated root cortex of Zea The data were analysed by two-way ANOVA.…”

Section: Cortexmentioning

confidence: 92%

Root structure and cellular chloride, sodium and potassium distribution in salinized grapevines

Storey¹,

Schachtman²,

Thomas³

2003

Plant Cell Environ

View full text Add to dashboard Cite

X-ray microanalysis was used to study the patterns of K + + + + , Na + + + + and Claccumulation in salinized (25 m M NaCl) and non-salinized grapevine ( Vitis ) roots. The aim was to determine whether NaCl affects patterns of Claccumulation differentially in the roots of a Cl --excluding genotype and a non-excluding genotype. Two regions of fibrous roots were analysed: (1) a region 2-3 mm basipetal to the root tip; and (2) a region of the root 10-12 mm basipetal to the root tip where the outermost layer is the hypodermis. The ion contents of the hypodermis, cortex, endodermis and pericycle vacuoles were analysed. Data were also collected from the cytoplasm of the endodermal and pericycle cells. The analyses showed that the ion profiles of the hypodermis and the endodermis were significantly different from those of the cortex and pericycle. The hypodermis and endodermis had higher K + + + + and lower Na + + + + and Clthan surrounding cells. Some changes due to salinity such as increased K + + + + concentrations in the hypodermis were also noted. Chloride concentrations did not differ between the genotypes in the hypodermis, across the cortex or in the endodermis, but were higher in the pericycle of the excluder in comparison with the non-excluding genotype. However, K + + + + /Na + + + + ratios of the cortex and endodermis were higher in the excluder. The pericycle cells exhibited the greatest ability to sequester Na + + + + and Clin vacuoles. Overall the data show cell-type-specific ion accumulation patterns and small but significant differences were found between genotypes. The possibility that these accumulation patterns arise from differences in uptake properties of cell types and/or result from the spatial distribution of the cell types along the competing symplastic and apoplastic ion transport pathways across the root is discussed.

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Profiles of Chloride Concentration and PD in the Root ofCommelina communisL.

Cited by 13 publications

References 1 publication

Turgor-regulation during extension growth and osmotic stress of maize roots. An example of single-cell mapping

Turgor-regulation during extension growth and osmotic stress of maize roots. An example of single-cell mapping

Root structure and cellular chloride, sodium and potassium distribution in salinized grapevines

Root structure and cellular chloride, sodium and potassium distribution in salinized grapevines

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