Ion Uptake by Plant Roots

Davenport, Romola

doi:10.1002/9780470988862.ch8

Cited by 6 publications

(1 citation statement)

References 88 publications

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“…These methods have frequently been used to evaluate nutrient element absorption in roots. Radioisotopes in solute were the most useful markers used in these studies because they are chemically similar to the solute and can be distinguished from non‐labeled solutes already contained in the roots (Davenport 2007). However, there are limitations to this method, including radioisotope administrative restriction and the restricted half‐life of the radioisotope.…”

Section: Resultsmentioning

confidence: 99%

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd

Mori

Kawasaki

Ishikawa

et al. 2009

Soil Science and Plant Nutrition

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Radioisotope techniques are well known as methods for evaluating symplastic ion absorption in roots. In the present study, a new method for evaluating symplastic cadmium (Cd) absorption in plant roots was developed using the enriched isotopes Cd at 25°C for 30 min. The roots were excised from each seedling and were then immersed in a cold buffer solution without Cd at 2°C for 120 min to suppress the metabolic activity of the roots. Finally, the roots were treated with a cold buffer solution containing enriched stable isotope 114 Cd at 2°C for 120 min, whereby the apoplastically bound 113Cd was desorbed. We tested the validity of our method for evaluating symplastic Cd in roots compared with the conventional method based on differences in the amount of Cd absorbed at 2°C and 25°C using unlabeled Cd. There was no difference in the symplastic Cd content of the roots between the two methods. These results indicate that it is possible to evaluate the symplastic Cd content in roots using the enriched isotopes Cd.

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Section: Resultsmentioning

confidence: 99%

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd

Mori

Kawasaki

Ishikawa

et al. 2009

Soil Science and Plant Nutrition

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Ion distribution measured by electron probe X-ray microanalysis in apoplastic and symplastic pathways in root cells in sunflower plants grown in saline medium

Ebrahimi

Bhatla

2012

J Biosci

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Little is known about how salinity affects ions distribution in root apoplast and symplast. Using x-ray microanalysis, ions distribution and the relative contribution of apoplastic and symplastic pathways for delivery of ions to root xylem were studied in sunflower plants exposed to moderate salinity (EC=6). Cortical cells provided a considerably extended Na(+) and Cl(-) storage facility. Their contents are greater in cytoplasm (root symplast) as compared to those in intercellular spaces (root apoplast). Hence, in this level of salinity, salt damage in sunflower is not dehydration due to extracellular accumulation of sodium and chloride ions, as suggested in the Oertli hypothesis. On the other hand, reduction in calcium content due to salinity in intercellular space is less than reduction in the cytoplasm of cortical cells. It seems that sodium inhibits the radial movement of calcium in symplastic pathway more than in the apoplastic pathway. The cell wall seems to have an important role in providing calcium for the apoplastic pathway. Redistribution of calcium from the cell wall to intercellular space is because of its tendency towards xylem through the apoplastic pathway. This might be a strategy to enhance loading of calcium to xylem elements and to reduce calcium deficiency in young leaves under salinity. This phenomenon may be able to increase salt tolerance in sunflower plants. Supplemental calcium has been found to be effective in reducing radial transport of Na(+) across the root cells and their loading into the xylem, but not sodium absorption. Supplemental calcium enhanced Ca(2+) uptake and influx into roots and transport to stele.

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Ammonium and nitrate uptake, nitrogen productivity and biomass allocation in interior spruce families with contrasting growth rates and mineral nutrient preconditioning

Miller

Hawkins

2007

Tree Physiology

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Four full-sib families of interior spruce (Picea glauca (Moench) Voss) x Picea engelmanii Parry ex Engelm.) with contrasting growth rates (two fast-growing and two slow-growing families) were grown aeroponically with either a 2% relative nitrogen addition rate or free access to nitrogen. Fast-growing families showed greater plasticity in allocating biomass to shoots at high nitrogen supply and to roots at low nitrogen supply than slow-growing families. Compared with the slow-growing families, short-term net ammonium uptake rate measured with an ion selective electrode was significantly greater in fast-growing families at high ammonium supply, but not at low supply. Net nitrate uptake showed the same trend, but differences among families were not significant. Results indicate that differences in seedling growth rate are partly a result of physiological differences in net nitrogen uptake efficiency and nitrogen productivity.

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Ion Uptake by Plant Roots

Cited by 6 publications

References 88 publications

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd

Ion distribution measured by electron probe X-ray microanalysis in apoplastic and symplastic pathways in root cells in sunflower plants grown in saline medium

Ammonium and nitrate uptake, nitrogen productivity and biomass allocation in interior spruce families with contrasting growth rates and mineral nutrient preconditioning

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Ion Uptake by Plant Roots

Cited by 6 publications

References 88 publications

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes113Cd and114Cd

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes113Cd and114Cd

Ion distribution measured by electron probe X-ray microanalysis in apoplastic and symplastic pathways in root cells in sunflower plants grown in saline medium

Ammonium and nitrate uptake, nitrogen productivity and biomass allocation in interior spruce families with contrasting growth rates and mineral nutrient preconditioning

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A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd

A new method for evaluating symplastic cadmium absorption in the roots ofSolanum melongenausing enriched isotopes¹¹³Cd and¹¹⁴Cd