Physiology and Metabolism of Phosphate and Its Compounds

Bieleski, R. L.; Ferguson, I. B.

doi:10.1007/978-3-642-68885-0_15

Cited by 166 publications

(143 citation statements)

References 71 publications

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“…Our data support the view that C. is affected by plant P status, since there was a decline in C. after an extended period in P-depleted solutions (Fig. 5), coinciding with the appearance of P-deficiency symptoms Bieleski and Ferguson (4) (Table II). In the low P plants, 59 to 66% ofthe total counts were retained in the roots, compared with only 22 to 26% in the high P plants.…”

Section: 2wmsupporting

confidence: 89%

“…P loss in 10 min was about 0.06% of the total P in the roots at both ambient concentrations (Tables II and III). If efflux occurs from a pool of Pi which turns over rapidly and comprises about 10% of the total Pi in the roots (4), then the proportion of P lost from that pool in 10 min would be about 2% at 0.2 gM and 1% at 2.0 MM.…”

Section: Resultsmentioning

confidence: 99%

“…Mazel' and Fokin (16) argue that P efflux is strictly a passive exchange phenomenon, and of little consequence for net P accumulation. Bieleski and Ferguson (4) suggest that P efflux is at least partially under metabolic control and is a component of the mechanism whereby P balance is maintained in plants. There is very little information on the magnitude of P efflux in relation to P influx.…”

mentioning

confidence: 99%

“…There is very little information on the magnitude of P efflux in relation to P influx. The limited data available come from studies with aquatic plants (4,15), in which both roots and shoots absorb ions from the medium. In Spirodela oligorrhiza, the ratio of efflux to influx was approximately 0.08 in plants maintained in 1.0 mm P solutions.…”

mentioning

confidence: 99%

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Influx and Efflux of P in Roots of Intact Maize Plants

Elliott¹,

Lynch²,

Läuchli³

1984

Plant Physiol.

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ABSTRACIRates ofP influx and effiux were determined in whole plants at ambient P co tions compamble to those found in soil solutions. Maize (Zea mays L. var NC+59) seedings were trimnmed (endosperm and adventitions roots removed) and grown in a greenhouse in solution cultures at P concentrtions of approximately.0A and 1.8 micromolar. Roots of intact phlts previously exposed to NP-labeled solutions at 0.2 and 2.0 micromolar P for 48 hours were riosed 10 minutes in P-free solution and exposed to 33P solutions at 0.2 and 2.0 micromolar for 10 minutes. Net depletion of 3P from and appance of 32p in the ambient solution were used to measure influx and efflux. The ration of32P efflux to 3P influx was about 0.68 at 0.2 micromolar and 0.08 at 2.0 micromolar. When plants were allowed to deplete P from solutions, the P concentration in the medium dropped to about 0.15 micromolar within 24 hours and 0.05 micromolar within 60 hours. Results indicate that P efflux is a substantial component ofnet P accumulation at P concentrations normally found in soil solutions.Loss of P from plant roots to the ambient medium has been well documented (9,11,16,26). Conflicting opinions have been advanced, however, on the significance of P efflux in the P economy of plants. Mazel' and Fokin (16) argue that P efflux is strictly a passive exchange phenomenon, and of little consequence for net P accumulation. Bieleski and Ferguson (4) suggest that P efflux is at least partially under metabolic control and is a component of the mechanism whereby P balance is maintained in plants. There is very little information on the magnitude of P efflux in relation to P influx. The limited data available come from studies with aquatic plants (4, 15), in which both roots and shoots absorb ions from the medium. In Spirodela oligorrhiza, the ratio of efflux to influx was approximately 0.08 in plants maintained in 1.0 mm P solutions. Both influx and efflux decreased as the ambient P concentration was lowered, but the decrease in influx was proportionally greater than the decrease in effiux. In plants transferred from 1.0 mM P to 1.0 AM P, the ratio of efflux to influx was 0.70.Indirect evidence for the importance of efflux in P accumulation comes from studies of P depletion from nutrient solutions. If decreasing ambient P concentration affects influx to a greater extent than efflux, then efflux and influx should be equal at some limiting ambient P concentration, i.e. there would be no net accumulation. Experiments with several maize genotypes have indicated that net P accumulation ceases at concentrations ranging from 0.04 to 3.7 ,uM (1, 2 tration range of bulk soil solutions (20). Thus, it appears that efflux may be nearly equal to influx at ambient P concentrations comparable to those experienced by roots of terrestrial plants.In the work with Spirodela (4, 15) influx and efflux were measured in separate experiments. Nitrate influx and efflux, however, were measured simultaneously using 14NO3 and 15NO- (12,14,17). The availability of two radioisotopes of P, 3...

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Section: 2wmsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Influx and Efflux of P in Roots of Intact Maize Plants

Elliott¹,

Lynch²,

Läuchli³

1984

Plant Physiol.

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“…A in C. crispus are not the inorganic P fraction, but the reversible transformation between the insoluble and organic and acid-insoluble P fractions, the latter soluble fractions is a fundamental reaction during fraction possibly containing polyphosphates the mobilization of polyphosphates (Kuhl, 1960). (Bieleski & Ferguson, 1983).…”

Section: Introductionmentioning

confidence: 99%

Polyphosphates in the red macroalga Chondrus crispus (Rhodophyceae)

1997

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SUMMARYPlants of Chondrus crispus Stackhouse, collected from mid-littoral tidepools, were treated as follows. Some plants were kept for a few weeks under controlled starvation conditions in order to decrease their initial content of total tissue phosphorus, then incubated for up to 48 h in phosphorus (15 /^M) and nitrogen (25 /iM)enriched sea water. Other plants were directly incubated in enriched sea water. Chemical analyses showed that the total phosphorus content of fresh and starved plants remained stable, reflecting the nutritional status of the plants. The predominant acid-soluble phosphate fraction was larger in fresh than in starved plants. The content of acid-soluble polyphosphates, similar in both types of plants at the beginning of the experiment, doubled in starved plants, and increased by a factor of 2-7 in fresh plants, over 48 h. The content of acid-insoluble polyphosphates was lower than that of acid-soluble polyphosphates.Transmission electron microscopy and energy dispersive X-ray microanalysis confirmed the presence, mostly in medullary cells, of acid-insoluble polyphosphates in the form of cytoplasmic granules and precipitates along the plasmalemma, particularly near pit plugs. This is the first report of such phosphorus storage structures in a red macroalgal species.

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Mineral Nutrient Acquisition and Metabolism

Brouder

Volenec

2020

Forages

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Physiology and Metabolism of Phosphate and Its Compounds

Cited by 166 publications

References 71 publications

Influx and Efflux of P in Roots of Intact Maize Plants

Influx and Efflux of P in Roots of Intact Maize Plants

Polyphosphates in the red macroalga Chondrus crispus (Rhodophyceae)

Mineral Nutrient Acquisition and Metabolism

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