Photosynthetic Nitrogen Assimilation: Inter-Pathway Control and Signaling

2002 ◽  
pp. 1-22 ◽  
Author(s):  
Christine H Foyer ◽  
Graham Noctor
Keyword(s):  
Nitrogen Assimilation

Nitrogen Assimilation in an Improved Alfalfa Population 1

Crop Science ◽  
1985 ◽  
Vol 25 (6) ◽  
pp. 1011-1015 ◽  
Author(s):  
Donald A. Phillips ◽  
Scott D. Cunningham ◽  
Eulogio J. Bedmar ◽  
T. Colleen Sweeney ◽  
Larry R. Teuber
Keyword(s):  
Nitrogen Assimilation

Nitrogen assimilation and gene regulation of two Kentucky bluegrass cultivars differing in response to nitrate supply

2021 ◽  
Vol 288 ◽  
pp. 110315
Author(s):  
Xiaoyang Sun ◽  
Qianjiao Zheng ◽  
Liangbing Xiong ◽  
Fuchun Xie ◽  
Xun Li ◽  
...  
Keyword(s):  
Gene Regulation ◽  
Nitrogen Assimilation ◽  
Kentucky Bluegrass ◽  
Nitrate Supply

Extended photoperiods after flowering increase the rate of dry matter production and nitrogen assimilation in mid maturing soybean cultivars

2021 ◽  
Vol 265 ◽  
pp. 108104
Author(s):  
Santiago Julián Kelly ◽  
María Gabriela Cano ◽  
Diego Darío Fanello ◽  
Eduardo Alberto Tambussi ◽  
Juan José Guiamet
Keyword(s):  
Dry Matter ◽  
Nitrogen Assimilation ◽  
Dry Matter Production ◽  
Soybean Cultivars ◽  
Matter Production

scholarly journals Biochar induced improvement in root system architecture enhances nutrient assimilation by cotton plant seedlings

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Lei Feng ◽  
Wanli Xu ◽  
Guangmu Tang ◽  
Meiying Gu ◽  
Zengchao Geng
Keyword(s):  
Root System ◽  
System Architecture ◽  
Fine Roots ◽  
Nitrogen Assimilation ◽  
Surface Soil ◽  
Soil Layer ◽  
Root System Architecture ◽  
Seedling Stage ◽  
Agronomic Efficiency ◽  
Surface Soil Layer

Abstract Background Raising nitrogen use efficiency of crops by improving root system architecture is highly essential not only to reduce costs of agricultural production but also to mitigate climate change. The physiological mechanisms of how biochar affects nitrogen assimilation by crop seedlings have not been well elucidated. Results Here, we report changes in root system architecture, activities of the key enzymes involved in nitrogen assimilation, and cytokinin (CTK) at the seedling stage of cotton with reduced urea usage and biochar application at different soil layers (0–10 cm and 10–20 cm). Active root absorption area, fresh weight, and nitrogen agronomic efficiency increased significantly when urea usage was reduced by 25% and biochar was applied in the surface soil layer. Glutamine oxoglutarate amino transferase (GOGAT) activity was closely related to the application depth of urea/biochar, and it increased when urea/biochar was applied in the 0–10 cm layer. Glutamic-pyruvic transaminase activity (GPT) increased significantly as well. Nitrate reductase (NR) activity was stimulated by CTK in the very fine roots but inhibited in the fine roots. In addition, AMT1;1, gdh3, and gdh2 were significantly up-regulated in the very fine roots when urea usage was reduced by 25% and biochar was applied. Conclusion Nitrogen assimilation efficiency was significantly affected when urea usage was reduced by 25% and biochar was applied in the surface soil layer at the seedling stage of cotton. The co-expression of gdh3 and gdh2 in the fine roots increased nitrogen agronomic efficiency. The synergistic expression of the ammonium transporter gene and gdh3 suggests that biochar may be beneficial to amino acid metabolism.

Nitrogen Assimilation in Alfalfa: Isolation and Characterization of an Asparagine Synthetase Gene Showing Enhanced Expression in Root Nodules and Dark-Adapted Leaves

1997 ◽  
Vol 9 (8) ◽  
pp. 1339 ◽  
Author(s):  
Lifang Shi ◽  
Scott N. Twary ◽  
Hirofumi Yoshioka ◽  
Robert G. Gregerson ◽  
Susan S. Miller ◽  
...  
Keyword(s):  
Nitrogen Assimilation ◽  
Root Nodules ◽  
Asparagine Synthetase ◽  
Isolation And Characterization ◽  
Enhanced Expression

scholarly journals Nitrogen assimilation defects in a mutant ofRhodopseudomonas capsulatablocked in α-ketoglutarate generation

1977 ◽  
Vol 2 (5) ◽  
pp. 267-270
Author(s):  
J.T. Beatty ◽  
B.C. Johansson ◽  
J.D. Wall ◽  
Howard Gest
Keyword(s):  
Nitrogen Assimilation

Control of nitrogen assimilation in Stichococcus bacillaris by growth conditions

1987 ◽  
Vol 65 (3) ◽  
pp. 432-437 ◽  
Author(s):  
Iftikhar Ahmad ◽  
Johan A. Hellebust
Keyword(s):  
Glutamine Synthetase ◽  
Nitrogen Assimilation ◽  
Continuous Light ◽  
Synthetase Activity ◽  
Glutamine Synthetase Activity ◽  
Dark Cycle ◽  
Continuous Darkness ◽  
Cell Carbon ◽  
Stichococcus Bacillaris ◽  
Mixotrophic Conditions

Stichococcus bacillaris Naeg. (Chlorophyceae) grown on a 12 h light: 12 h dark cycle divides synchronously under photoautotrophic conditions and essentially nonsynchronously under mixotrophic conditions. Photoassimilation of carbon under photoautotrophic conditions was followed by a decline in cell carbon content during the dark period, whereas under mixotrophic conditions cell carbon increased throughout the light–dark cycle. The rates of nitrogen assimilation by cultures grown on either nitrate or ammonium declined sharply during the dark, and these declines were most pronounced under photoautotrophic conditions. Photoautotrophic cells synthesized glutamine synthetase and NADPH – glutamate dehydrogenase (GDH) exclusively in the light, whereas in mixotrophic cells about 20% of the total synthesis of these enzymes during one light–dark cycle occurred in the dark. NADH–GDH was synthesized almost continuously over the entire light–dark cycle. In the dark, both under photoautotrophic and mixotrophic conditions, the alga contained more than 50% of glutamine synthetase in an inactive form, which was reactivated in vitro in the presence of mercaptoethanol and in vivo after returning the cultures to the light. The thermal stability of glutamine synthetase activity was less in light-harvested cells than in dark-harvested cells. The inactivation of glutamine synthetase did not occur in cultures growing either heterotrophically in continuous darkness or photoautotrophically in continuous light. This enzyme appears to be under thiol control only in cells grown under alternating light–dark conditions, irrespective of whether this light regime results in synchronous cell division or not.

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