The effect of nitrate concentration in a flowing solution system on growth and nitrate uptake of twoPlantago species

1984 ◽  
Vol 77 (2-3) ◽  
pp. 159-169 ◽  
Author(s):  
A. H. J. Freijsen ◽  
H. Otten
Keyword(s):  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Solution System ◽  
Flowing Solution

scholarly journals Effect of External Nitrate Concentration on Nitrate and Iron Uptake and Assimilation in Vaccinium Species

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1116C-1116
Author(s):  
Rebecca Darnell
Keyword(s):  
Nitrate Reductase ◽  
Iron Uptake ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Dry Weight ◽  
Optimal Growth ◽  
Low Ph ◽  
Iron Nitrate ◽  
Nr Activity ◽  
Soil Adaptation

Most Vaccinium species, including V. corymbosum, have strict soil requirements for optimal growth, requiring low pH, high iron, and nitrogen, primarily in the ammonium form. V. arboreum is a wild species adapted to high pH, low iron, nitrate-containing soils. This broader soil adaptation in V. arboreum may be related to increased efficiency of iron or nitrate uptake/assimilation compared with cultivated Vaccinium species. To test this, nitrate and iron uptake, and nitrate reductase (NR) and ferric chelate reductase (FCR) activities were compared in two Vaccinium species, V. arboreum and the cultivated V. corymbosum. Plants were grown hydroponically for 15 weeks in either 1.0 or 5.0 mm NO3 with 0.09 mm Fe. Root FCR activity was greater in V. arboreum compared with V. corymbosum, especially at the lower external nitrate concentration. However, this was not reflected in differences in iron uptake. Nitrate uptake and root NR activity were greater in V. arboreum compared with V. corymbosum. The lower nitrate uptake and assimilation in V. corymbosum was reflected in decreased plant dry weight compared with V. arboreum. V. arboreum appears to be more efficient in acquiring nitrate compared with V. corymbosum, possibly due to increased NR activity, and this may partially explain the wider soil adaptation of V. arboreum.

scholarly journals The Adsorption and Regeneration of Natural Pumice as Low-Cost Adsorbent for Nitrate Removal From Water

2018 ◽  
Vol 3 (2) ◽  
pp. 86 ◽  
Author(s):  
Denny Helard ◽  
Shinta Indah ◽  
Chintia Maya Sari ◽  
Hestia Mariesta
Keyword(s):  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Low Cost ◽  
Nitrate Removal ◽  
Pollutant Removal ◽  
Batch Experiments ◽  
Experimental Parameters ◽  
Freundlich Adsorption Isotherm ◽  
Adsorption Desorption ◽  
Multiple Adsorption

The potential of adsorption and regeneration of Indonesian natural pumice to remove nitrate from aqueous solution was studied in multiple adsorption-desorption cycles. Batch experiments were performed to examine the effect of various experimental parameters on the removal of nitrate. The optimum condition of nitrate removal by natural pumice were obtained at 3 of pH solution, 0.3 g/L of adsorbent dose, 30 min of contact time, <63 μm of particle size, and 90 mg/L of nitrate concentration with 54.79% of removal efficiency and 164.37 mg/g of nitrate uptake. The experimental data obtained were fitted with the Freundlich adsorption isotherm within the concentration range studied. Although complete desorption were not achieved, the result confirmed that HCl can be used as desorbing and recovery agent, which be desorbed 10-13% of nitrate ion. The used natural pumice also could be regenerated and reused up to three successive adsorption-desorption cycles. Overall results revealed that the ability of natural pumice to adsorb nitrate will create more interest to develop a new adsorbent from local mineral for pollutant removal from water

Identification of Sugar Signals Controlling the Nitrate Uptake by Rice Roots Using a Noninvasive Technique

2009 ◽  
Vol 64 (9-10) ◽  
pp. 697-703 ◽  
Author(s):  
Shiyi Zhou ◽  
Xuan Gao ◽  
Changdong Wang ◽  
Guangxiao Yang ◽  
William John Cram ◽  
...  
Keyword(s):  
Gene Expression ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Positive Control ◽  
Nitrate Transporter ◽  
Transporter Gene ◽  
Rt Pcr ◽  
Noninvasive Technique ◽  
Rice Roots ◽  
Nitrate Transporter Gene

In order to evaluate the hypothesis that nitrate uptake is under positive control by sugars, a simple noninvasive model was used to measure the effects of nine modulating sugars on the net nitrate uptake in rice under constant low nitrate concentration. The results showed that the fastest and greatest acceleration in nitrate uptake were observed after sucrose was added, and this change reached a peak 1.5 h after treatment. In addition, we found that 1 mM sucrose could affect the nitrate uptake in rice roots for 8.5 h. The three most positive effective sugars and one negative effective sugar were selected for further analyzing their effect on the expression of nitrate transporter gene OsNrt2.1. The result of RT-PCR showed that the expression of OsNrt2.1 was upregulated by sucrose, glucose and galactose. Among the three positive effective sugars tested, sucrose was found to have significant and continuous enhanced stimulation on OsNrt2.1 gene expression within 4 h, which indicated that sucrose could be as a specific signal to regulate the net nitrate uptake

Nitrate Uptake Rate by Soybean and Wheat Plants Determined by External Nitrate Concentration and Shoot-Mediated Demand

1998 ◽  
Vol 159 (2) ◽  
pp. 305-312 ◽  
Author(s):  
Carole H. Saravitz ◽  
Florence Devienne-Barret ◽  
C. David Raper, ◽  
Sylvain Chaillou ◽  
Thierry Lamaze
Keyword(s):  
Uptake Rate ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Nitrate Uptake Rate

Linking the physiological parameters of nitrate uptake with root morphology and topology in wheat (Triticum durum) and citrus (Citrus volkameriana) rootstock

2002 ◽  
Vol 80 (5) ◽  
pp. 494-503 ◽  
Author(s):  
A Sorgonà ◽  
G Cacco
Keyword(s):  
Root Morphology ◽  
Triticum Durum ◽  
Topological Index ◽  
Nitrate Uptake ◽  
Nitrate Concentration ◽  
Root Systems ◽  
Total Root Length ◽  
Root Tips ◽  
And Topology ◽  
Citrus Volkameriana

The relationships between net nitrate uptake and root morphology and topology were investigated in wheat (Triticum durum Desf.) and citrus (Citrus volkameriana Ten. & Pasq.) seedlings in which root systems were modified by supplying different nutrient concentrations. Root morphological and topological changes were assessed by the number of root tips, the total root length, and the topological index. The net nitrate uptake process was evaluated during the induction and inhibition "feedback" regulation phases. In wheat seedlings, an increase in the external nitrate concentration, at either high or no phosphate, brought about an increase in number of root tips but did not affect total root length. A similar pattern was observed in citrus seedlings. Citrus seedlings also exhibited a shift in root branching pattern from herringbone to dichotomous with an increase in the external nitrate concentration. Conversely, wheat root topology was unaffected by nutrient treatments. A high level of nitrate supplied to wheat and citrus root systems reduced the full induction of the nitrate uptake rate and cumulative nitrate uptake but increased the half-time of reaching the full induction in net nitrate uptake (t1/2 kind). Finally, a negative correlation between number of root tips and t1/2 kind was found in both species, while only in citrus seedlings was a positive correlation between t1/2 kind and the topological index observed. The data suggest that root morphology has a greater effect on nitrate uptake than root topology.Key words: root morphology, root topology, net nitrate uptake, Citrus volkameriana, Triticum durum.

Residence Time in Hyporheic Bioactive Layers Explains Nitrate Uptake in Streams

2020 ◽  
Author(s):  
Angang Li ◽  
Susana Bernal ◽  
Brady Kohler ◽  
Steven A. Thomas ◽  
Eugènia Martí ◽  
...  
Keyword(s):  
Residence Time ◽  
Nitrate Uptake
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