Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability

Falkengren‐Grerup, Ursula; Månsson, Katarina; Olsson, M O

doi:10.1016/s0098-8472(00)00068-x

Cited by 76 publications

(42 citation statements)

References 39 publications

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“…So, when the organic nitrogen sources become relatively less important due to increased atmospheric nitrogen, the grasses-which can benefit more from the inorganic nitrogen sources than ericaceous plants-will outcompete the heathland shrubs (Berendse and Aerts 1984). Notwithstanding the fact that the grass, Deschampsia have been shown to be also able to use organic nitrogen Falkengren-Grerup et al 2000) and even can be colonized by ericoid endophytic fungi (Zijlstra et al 2005), the highest N uptake rates are realised on ammonium and nitrate sources (Persson et al 2003). Although the responses in our experiments were different, our data from the greenhouse experiment show that increased nitrogen addition can reduce mycorrhizal colonisation, which can result in less organic nitrogen being available to the ericaceous species (Sokolovski et al 2002).…”

Section: Responses Of Tannins To N Supply and Light Intensitymentioning

confidence: 55%

The effect of nutrient supply and light intensity on tannins and mycorrhizal colonisation in Dutch heathland ecosystems

Hofland-Zijlstra

Berendse

2008

Plant Ecol

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(1) Increased atmospheric nitrogen deposition has shifted plant dominance from ericaceous plants to grass species. To elucidate the reduced competitiveness of heather, we tested the hypothesis that additions of nitrogen reduce the concentrations of phenolics and condensed tannins in ericaceous leaves and retard mycorrhizal colonisation in ericaceous plants. We also tested the negative effects of reduced light intensity on carbon-based secondary compounds and mycorrhizal colonisation in ericaceous plants. (2) We performed a field inventory at three heathland sites in the Netherlands varying in nutrient supply and light intensity. Leaves of ericaceous plants and grasses were collected and analysed for concentrations of tannins, phenolics and nutrients. Similarly, we took root samples to record mycorrhizal colonisation and soil samples to measure the soil mineralisation. In addition, we conducted two-factorial experiments with Calluna vulgaris plants, in which we varied fertiliser and shade levels under greenhouse and field conditions. (3) The field inventory revealed that nitrogen addition and shading both negatively affected the concentration of total phenolics. The total phenolics and condensed tannin concentrations were positively correlated (P \ 0.001), but in the field experiment, the condensed tannins were not significantly affected by the treatments. Our results provide the first evidence that the carbon nutrient balance can be used to predict the amount of total phenolics in the dwarf shrub C. vulgaris. (4) In the field experiments, shading of plants resulted in significantly less mycorrhizal colonisation. Only in the greenhouse experiment did addition of nitrogen negatively affect mycorrhizal colonisation. (5) Our results imply that increased atmospheric nitrogen deposition can depress the tannin concentrations in ericaceous plants and the mycorrhizal colonisation in roots, thereby reducing the plants' competitiveness with respect to grasses. Additionally, if ericaceous plants are shaded by grasses that have become dominant due to increased nitrogen supply, these effects will be intensified and competitive replacement will be accelerated.

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Section: Responses Of Tannins To N Supply and Light Intensitymentioning

confidence: 55%

The effect of nutrient supply and light intensity on tannins and mycorrhizal colonisation in Dutch heathland ecosystems

Hofland-Zijlstra

Berendse

2008

Plant Ecol

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“…Whole plants, rather than excised roots, were used since treatment responses can vary greatly between methodologies using excised roots and whole plants (Falkengren-Grerup et al 2000). We acknowledge that this laboratory procedure may influence root structure, however, this method is generally accepted and has been used widely (Bradley and Morris 1990, Chambers et al 1998, Falkengren-Grerup et al 2000. Glycine and glutamic acid, the dominant amino acids in marsh porewater (Gardner and Hanson 1979), were chosen for use in the laboratory experiments.…”

Section: Single Concentration Uptake Experimentsmentioning

confidence: 99%

“…Most importantly, our study provides a common metric that can be used to compare differences in N uptake parameters. Finally, use of intact plants assured that we did not overestimate assimilation kinetics as is possible in experiments where rates are determined from excised roots (Falkengren-Grerup et al 2000).…”

Section: Don Assimilationmentioning

confidence: 99%

Nitrogen Uptake by Native and Invasive Temperate Coastal Macrophytes: Importance of Dissolved Organic Nitrogen

Mozdzer

Zieman

McGlathery

2010

Estuaries and Coasts

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We investigated if the success of the invasive common reed Phragmites australis could be attributed to a competitive ability to use dissolved organic nitrogen (DON) when compared to the dominant macrophyte Spartina alterniflora in tidal wetlands. Short-term nutrient uptake experiments were performed in the laboratory on two genetic lineages of Phragmites (native and introduced to North America) and S. alterniflora. Our results provide the first evidence for direct assimilation of DON by temperate marsh plants and indicate that amino acids are assimilated intact by all plant types at similar rates. Both Phragmites lineages had significantly greater urea-N assimilation rates than S. alterniflora, and the affinity for dissolved inorganic nitrogen (DIN) species was the greatest in native Phragmites > introduced Phragmites > S. alterniflora. Field studies demonstrated uptake of both DON and DIN in similar proportion as those determined in the laboratory experiments. Based on these uptake rates, we estimate that DON has the potential to account for up to 47% of N demand for Phragmites plants, and up to 24% for S. alterniflora plants. Additionally, we suggest that differences in N uptake between native and introduced Phragmites lineages explain one mechanism for the success of the introduced type under increasingly eutrophic conditions.

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“…Recently, Jin et al, (2014) demonstrated that nitrogen in the forms of urea and nitrate affect plant P uptake differently (Jin et al, 2014). NH 4 + and NO 3 2 are the two major N sources that are taken up by plant roots (Marschner, 1995;Falkengren-Grerup et al, 2000). In general, with the absorption of NH 4 + by plants, the related proton release decreases the pH of the rhizosphere (Wang et al, 1993;Mistrik and Ullrich, 1996;Schubert and Yan, 1997;Zhao et al, 2009), which leads to increased solubility and uptake of P by the plants (Sarkar and Jones, 1982;Hoffmann et al, 1994).…”

mentioning

confidence: 99%

Differential effects of nitrogen forms on cell wall phosphorus remobilization in rice (Oryza sativa) are mediated by nitric oxide, pectin content and the expression of the phosphate transporter OsPT2

Zhu¹,

Zhu²,

Hu³

et al. 2016

Plant Physiol.

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+ is a major source of inorganic nitrogen for rice (Oryza sativa), and NH 4 + is known to stimulate the uptake of phosphorus (P). However, it is unclear whether NH 4 + can also stimulate P remobilization when rice is grown under P-deficient conditions. In this study, we use the two rice cultivars 'Nipponbare' and 'Kasalath' that differ in their cell wall P reutilization, to demonstrate that NH 4 + positively regulates the pectin content and activity of pectin methylesterase in root cell walls under 2P conditions, thereby remobilizing more P from the cell wall and increasing soluble P in roots and shoots. Interestingly, our results show that more NO (nitric oxide) was produced in the rice root when NH 4 + was applied as the sole nitrogen source compared with the NO 3 2. The effect of NO on the reutilization of P from the cell walls was further demonstrated through the application of the NO donor SNP (sodium nitroprusside) and c-PTIO (NO scavenger 2-(4-carboxyphenyl)-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide). What's more, the P-transporter gene OsPT2 is up-regulated under NH 4 + supplementation and is therefore involved in the stimulated P remobilization. In conclusion, our data provide novel (to our knowledge) insight into the regulatory mechanism by which NH 4 + stimulates Pi reutilization in cell walls of rice.

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Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability

Cited by 76 publications

References 39 publications

The effect of nutrient supply and light intensity on tannins and mycorrhizal colonisation in Dutch heathland ecosystems

The effect of nutrient supply and light intensity on tannins and mycorrhizal colonisation in Dutch heathland ecosystems

Nitrogen Uptake by Native and Invasive Temperate Coastal Macrophytes: Importance of Dissolved Organic Nitrogen

Differential effects of nitrogen forms on cell wall phosphorus remobilization in rice (Oryza sativa) are mediated by nitric oxide, pectin content and the expression of the phosphate transporter OsPT2

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