Dissolved organic nitrogen uptake by plants—an important N uptake pathway?

Jones, Davey L.; Healey, John R.; Willett, Victoria B.; Farrar, J. F.; Hodge, Angela

doi:10.1016/j.soilbio.2004.08.008

Cited by 516 publications

(338 citation statements)

References 72 publications

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“…Experiments that directly apply amino acid solutions instead of a soil environment neglect the importance of microorganisms as competitors for these substances and as main decomposers. It has been shown that the results obtained under such conditions are distinctly different from those obtained in the field (Jones et al 2005) and hence cannot reveal the ecological significance of organic N acquisition. Second, classic 15 N-tracer studies alone, not in combination with 14 C or 13 C labels, cannot separate the uptake of intact amino acids from uptake of mineralized N. Recently, the acquisition of organic N as intact amino acids by plants has been demonstrated using dual-labelled ( 13 C and 15 N) amino acids (Nä sholm and Persson 2001;Miller and Cramer 2004;Jones et al 2005).…”

Section: Introductionmentioning

confidence: 80%

“…Many plants in cold environments such as arctic (Chapin et al 1993;Kielland 1994;Schimel and Chapin 1996), boreal (Nä sholm et al 1998;Nä sholm and Persson 2001) and alpine ecosystems Raab et al 1996Raab et al , 1999Miller and Bowman 2003;Xu et al 2004) showed the capacities to take up organic N from soils in the form of low molecular-weight substances, mainly amino acids. Laboratory studies using Michaelis-Menten kinetics have estimated that amino acids may contribute 60% and between 10% and 82% to the annual N acquisition of E. vaginatum (Chapin et al 1993) and of 10 arctic tundra species (Kielland 1994), respectively, but the ecological significance of organic N to the total N uptake by plants has not been quantified under field conditions (Nä sholm and Persson 2001;Merilä et al 2002;Jones et al 2004Jones et al , 2005.…”

Section: Introductionmentioning

confidence: 99%

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Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Ouyang

Kuzyakov

et al. 2006

Plant Soil

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Though the potential of plants to take up organic N (e.g., amino acids) is well established, the true significance of organic N acquisition to plant N nutrition has not yet been quantified under field conditions. Here we demonstrate that organic N contributes significantly to the annual N uptake of three dominant plant species (Kobresia humilis, Saussurea superba and Stipa aliena) of alpine meadows on the Tibet Plateau, China. This was achieved by using double-labelled ( 14 C and 15 N) algae as a source for slow and continuous release of amino acids, and tracing both labels in the above-and belowground plant biomass. Four months after addition of algae, between 0.5% and 2.6% of 14 C and 5% and 14% of 15 N from added algae were recovered in the plants, which translate into an uptake of organic N between 0.3 mg N m )2 and 1.5 mg N m )2 . The calculated contribution of organic N to total N uptake was estimated to range between 21% and 35% for K. humilis, and between 13% and 21% for S. aliena and S. superba, respectively, implying that organic N uptake by grassland plants is quantitatively significant under field conditions in the studied alpine meadows. This finding has important ecological implications with regard to competition for organic N between microorganisms and plant roots.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Ouyang

Kuzyakov

et al. 2006

Plant Soil

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“…The rhizobacteria help to fix the atmospheric nitrogen in soil. The number of amino acid transporters have been identified in plants, which confirms that plants have require machinery for amino acids transport from soil into their roots [22]. However, soil bacteria induced amino acid changes were reported as scare.…”

Section: Phosphate Solubilizing Ability Of Bacterial Isolate Mj1212mentioning

confidence: 86%

Phosphate Solubilizing Bacillus megaterium mj1212 Regulates Endogenous Plant Carbohydrates and Amino Acids Contents to Promote Mustard Plant Growth

et al. 2014

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The current study was conducted to explore the potential of a phosphate solubilizing soil bacterium, Bacillus megaterium mj1212 for enhancing the growth of mustard plants. The newly isolated bacterial strain mj1212 was identified as B. megaterium using phylogenetic analysis and, its phosphate solubilization ability was shown by the clear zone formation on National Botanical Research Institute's Phosphate medium. Moreover, the phosphate solubilization ability of B. megaterium mj1212 was enhanced by optimal culture conditions at pH 7.0 and 35°C which might be due to the presence of malic and quinic acid in the culture medium. The beneficial effect of B. megaterium mj1212 in mustard plants was determined by an increasing shoot length, root length and fresh weight of plants. In the biochemical analysis revealed that chlorophyll, sucrose, glucose, fructose and amino acids (Asp, Thr, Ser, Glu, Gly, Ala, Cys, Val, Met, Ilu, Leu, Tyr, Phe, Lys, His, Arg and Pro) were higher in B. megaterium mj1212 treated plants, when compared to their control. The result of present study suggests that B. megaterium mj1212 treatment could be act as phosphate biofertilizer to improve the plant growth.

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“…The concentration of dissolved organic C, or more precisely water-extractable organic C, has been reported by a number of researchers as a parameter which consistently decreases during the decomposition process, and has therefore been related to the process of stabilization [123]. The conversion of solid organic matter into dissolved organic matter has been shown to be the rate limiting step to the supply of N [24,54] and is therefore, likely to influence C and N dynamics in soil [77]. For example, the addition of a labile fraction of SOM to soil did not affect gross N mineralization, but markedly increased immobilization [37].…”

Section: Transformation Of Carbon and Nitrogen During Decompositionmentioning

confidence: 99%

How Important is the Quality of Organic Amendments in Relation to Mineral N Availability in Soils?

et al. 2013

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Summary Wastes generated from municipal and agricultural activities have the tremendous potential for application in agriculture as a source of nutrients and as amendments to improve soil organic matter (SOM). A decline in SOM can represent a serious threat to soil fertility and quality. Nitrogen (N) mineralization from organic amendments is important for understanding the N dynamics in terrestrial ecosystems. In this review, quality of the amendments such as C/N ration, N content, and biochemical compositions, etc. are discussed. Since, C/N ratio cannot explain all differences in N mineralization; emphasis has been laid on characterizing different compounds in organic amendments that govern the mineralization process. The importance of simulation models has also been described in modeling N mineralization from some complex materials like compost, animal manures and farmyard manures. These complex simulation models once modified according to the quality of the organic amendments can simulate N mineralization and thus, they can be used for simulating N dynamics in terrestrial eco-systems.

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Dissolved organic nitrogen uptake by plants—an important N uptake pathway?

Cited by 516 publications

References 72 publications

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Significance of organic nitrogen acquisition for dominant plant species in an alpine meadow on the Tibet plateau, China

Phosphate Solubilizing Bacillus megaterium mj1212 Regulates Endogenous Plant Carbohydrates and Amino Acids Contents to Promote Mustard Plant Growth

How Important is the Quality of Organic Amendments in Relation to Mineral N Availability in Soils?

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