Effects of Nitrogen Levels and Nitrate/Ammonium Ratios on Oxalate Concentrations of Different Forms in Edible Parts of Spinach

Zhang, Yingpeng; Lin, Xianyong; Zhang, Yongsong; Zheng, Shao Jian; Du, Shaoting

doi:10.1080/01904160500311086

Cited by 69 publications

(77 citation statements)

References 37 publications

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“…The effects of nitrogen forms on oxalate concentrations in plants were reported by several authors, where oxalate content was reduced when ammonium/nitrate ratios in the fertilizers were increased (Takebe and Yoneyama, 1997;Rinallo and Modi, 2002;Zhang et al, 2005). The mechanism of the effects of different nitrogen form on oxalate concentrations in plants is not fully understood, but several processes have been implicated (Reid and Smith, 2001).…”

Section: Potential For Breeding Of Low Nitrate and Low Oxalate Spinachmentioning

confidence: 99%

“…Elia et al (1998) demonstrate that oxalate increased with a higher nitrate concentration. Zhang et al (2005) have shown that increased nitrogen supply increase oxalate content in spinach, but only up to a certain level. Other studies have shown that nitrate can efficiently induce between "open-pollinated cultivars" and "F1 hybrids" (P=0.5 and 0.4, respectively).…”

Section: Nitrate -Oxalate Relationshipmentioning

confidence: 99%

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Nitrate and oxalate in germplasm collections of spinach and other leafy vegetables

Solberg¹,

Axelsson²

2015

Emir. J. Food Agric

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Section: Potential For Breeding Of Low Nitrate and Low Oxalate Spinachmentioning

confidence: 99%

Section: Nitrate -Oxalate Relationshipmentioning

confidence: 99%

Nitrate and oxalate in germplasm collections of spinach and other leafy vegetables

Solberg¹,

Axelsson²

2015

Emir. J. Food Agric

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“…In the first setup, the CFW beds were planted with A. porum, and the HFCW beds were planted with S. melongena; in the second setup, I. aquatica and C. annum L were planted in the CFW and HFCW beds, respectively. [32]. The pH was adjusted to 6.0 ± 0.2 with dilute NaOH or HCl.…”

Section: Experimental Conditionsmentioning

confidence: 99%

The Influence of the Ratio of Nitrate to Ammonium Nitrogen on Nitrogen Removal in the Economical Growth of Vegetation in Hybrid Constructed Wetlands

2017

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Abstract:Growing vegetables economically in the use of constructed wetland for wastewater treatment can play a role in overcoming water and food scarcity.Allium porrum L., Solanum melongena L., Ipomoea aquatica Forsk., and Capsicum annuum L. plants were selected to grow in hybrid constructed wetland (CW) under natural conditions. The impact of the ratio of nitrate to ammonium nitrogen on ammonium and nitrate nitrogen removal and on total nitrogen were studied in wastewater. Constructed wetland planted with Ipomoea aquatica Forsk. and Solanum melongena L. showed higher removal efficiency for ammonium nitrogen under higher ammonium concentration, whereas Allium porrum L.-planted CW showed higher nitrate nitrogen removal when NO 3 -N concentration was high in wastewater. Capsicum annuum L.-planted CW showed little efficiency for both nitrogen sources compared to other vegetables.

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“…For example, the nitrate to ammonium ratio (NO 3 :NH 4 ) plays a role in the formation of oxalic acid in terrestrial plants, with decreasing NO 3 :NH 4 ratios causing decreases in oxalic acid concentrations (Palaniswamy et al 2004, Zhang et al 2005, Fontana et al 2006. Furthermore, increases in the NO3:NH 4 ratio caused increases in shikonin and betacyanins, whereas decreases in the NO 3 :NH 4 ratio caused increases in berberine and ubiquinone, indicating that the synthesis of metabolites in terrestrial plant taxa may be modulated by the oxidized:reduced nitrogen ratio (Fujita et al 1981, Nakagawa et al 1984, Ramachandra Rao and Ravishankar 2002.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of nitrogen to phosphorus and nitrate to ammonia ratios on cyanobacterial metabolite concentrations in eutrophic Midwestern USA reservoirs

Harris

Smith

Graham

et al. 2016

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Recent studies have shown that the total nitrogen to total phosphorus (TN:TP) ratio and nitrogen oxidation state may have substantial effects on secondary metabolite (e.g., microcystins) production in cyanobacteria. We investigated the relationship between the water column TN:TP ratio and the cyanobacterial secondary metabolites geosmin, 2-methylisoborneol (MIB), and microcystin using multiple years of data from 4 reservoirs located in the Midwestern United States. We also examined the relationship between water column concentrations of chemically oxidized (NO 3 ) and reduced (NH 3 ) nitrogen, the NO 3 :NH 3 ratio, cyanobacterial biovolume, and associated secondary metabolites. We found that the cyanobacterial secondary metabolites geosmin, MIB, and microcystin primarily occurred when the TN:TP ratio was <30:1 (by mass), likely due to higher cyanobacterial biovolumes at lower TN:TP ratios. We also found that relative cyanobacterial biovolume was inversely related to the NO 3 :NH 3 ratio. Both N 2 -and non-N 2 -fixing cyanobacteria seemed to produce secondary metabolites and had higher concentrations per unit biovolume when NO 3 :NH 3 ratios were relatively low. Our data thus are consistent with the hypothesis that lower TN:TP ratios favor cyanobacterial dominance and also suggest that relatively low NO 3 :NH 3 ratios provide conditions that may favor the production of cyanobacterial secondary metabolites. Our data further suggest that increases in the absolute concentrations of TP or NH 3 (or both), causing decreases in TN:TP and NO 3 :NH 3 ratios, respectively, may stimulate cyanobacteria having the metabolic ability to produce geosmin, MIB, or microcystins. Future studies should address how the NO 3 :NH 3 ratio affects phytoplankton community structure and occurrence and production of cyanobacterial secondary metabolites.

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Effects of Nitrogen Levels and Nitrate/Ammonium Ratios on Oxalate Concentrations of Different Forms in Edible Parts of Spinach

Cited by 69 publications

References 37 publications

Nitrate and oxalate in germplasm collections of spinach and other leafy vegetables

Nitrate and oxalate in germplasm collections of spinach and other leafy vegetables

The Influence of the Ratio of Nitrate to Ammonium Nitrogen on Nitrogen Removal in the Economical Growth of Vegetation in Hybrid Constructed Wetlands

Combined effects of nitrogen to phosphorus and nitrate to ammonia ratios on cyanobacterial metabolite concentrations in eutrophic Midwestern USA reservoirs

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