scholarly journals Nitrogenous compounds and nitrogen metabolism in the Liliaceae. 5. The metabolism of azetidine-2-carboxylic acid*

1959 ◽  
Vol 71 (2) ◽  
pp. 210-217 ◽  
Author(s):  
L. Fowden ◽  
Mary Bryant
Keyword(s):  
Carboxylic Acid ◽  
Nitrogen Metabolism ◽  
Nitrogenous Compounds

Nitrogen metabolism of Picea glauca. I. Seasonal changes of free amino acids in buds, shoot apices, and leaves, and the metabolism of uniformly labelled 14C-L-arginine by buds during the onset of dormancy

1968 ◽  
Vol 46 (7) ◽  
pp. 909-919 ◽  
Author(s):  
D. J. Durzan
Keyword(s):  
Amino Acids ◽  
Nitrogen Metabolism ◽  
Picea Glauca ◽  
Seasonal Changes ◽  
Late Summer ◽  
Soluble Nitrogen ◽  
Shoot Apices ◽  
Nitrogenous Compounds ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Metabolism

Buds, shoot apices, and leaves from terminal shoots of white spruce saplings accumulated high levels of alcohol-soluble nitrogen in spring, late summer, and early winter. Major components, e.g. arginine, glutamine and proline, of the soluble nitrogen showed patterns complementary to each other. These changes represented the storage and mobilization of nitrogenous compounds during the onset of dormancy or the growth of shoots. Leaves contained less total soluble nitrogen than buds or shoot apices. Soluble nitrogen and arginine content of leaves resembled buds in their seasonal patterns but changes in aspartic acid, glutamic acid, and alanine were much greater than in buds, especially in late summer.When the first frost appeared, uniformly labelled 14C-arginine, applied to the apices of buds, readily entered newly synthesized protein, and free arginine was converted to proline via ornithine. Proline with carbon derived from arginine also entered proteins that were metabolized at different rates. A fraction of the proline in protein was hydroxylated to hydroxyproline. Although traces of 14C-citrulline were detected, more carbon was metabolized to free guanidino compounds, e.g. α-keto-δ-guanidinovaleric acid, γ-guanidinobutyric acid, and several monosubstituted guanidines. After 24 hours, labelled arginine, proline, and γ-guanidinobutyric acid moved down the shoot to the leaves. These metabolic changes in buds show that many of the seasonal changes in amino acids are intimately related to the carbon and nitrogen metabolism of arginine.

Nitrogenous Compounds and Nitrogen Metabolism in the Liliaceae

1957 ◽  
Vol 21 (2) ◽  
pp. 193-201 ◽  
Author(s):  
R. M. ZACHARIUS ◽  
H. M. CATHEY ◽  
F. C. STEWARD
Keyword(s):  
Nitrogen Metabolism ◽  
Nitrogenous Compounds

Distinct physiological and transcriptional responses of leaves of paper mulberry (Broussonetia kazinoki × B. papyrifera) under different nitrogen supply levels

2020 ◽  
Vol 40 (5) ◽  
pp. 667-682
Author(s):  
Jianwei Ni ◽  
Shang Su ◽  
Hui Li ◽  
Yonghang Geng ◽  
Houjun Zhou ◽  
...  
Keyword(s):  
Nitrogen Metabolism ◽  
Expression Patterns ◽  
Sugar Metabolism ◽  
Glutamate Synthase ◽  
Amino Sugar ◽  
Nitrogen Supply ◽  
Inorganic Pyrophosphatase ◽  
Transcriptional Responses ◽  
Nitrogenous Compounds ◽  
Nitrogen Concentrations

Abstract Paper mulberry, a vigorous pioneer species used for ecological reclamation and a high-protein forage plant for economic development, has been widely planted in China. To further develop its potential value, it is necessary to explore the regulatory mechanism of nitrogen metabolism for rational nitrogen utilization. In this study, we investigated the morphology, physiology and transcriptome of a paper mulberry hybrid (Broussonetia kazinoki × B. papyrifera) in response to different nitrogen concentrations. Moderate nitrogen promoted plant growth and biomass accumulation. Photosynthetic characteristics, concentration of nitrogenous compounds and activities of enzymes were stimulated under nitrogen treatment. However, these enhancements were slightly or severely inhibited under excessive nitrogen supply. Nitrite reductase and glutamate synthase were more sensitive than nitrate reductase and glutamine synthetase and more likely to be inhibited under high nitrogen concentrations. Transcriptome analysis of the leaf transcriptome identified 161,961 unigenes. The differentially expressed genes associated with metabolism of nitrogen, alanine, aspartate, glutamate and glycerophospholipid showed high transcript abundances after nitrogen application, whereas those associated with glycerophospholipid, glycerolipid, amino sugar and nucleotide sugar metabolism were down-regulated. Combined with weighted gene coexpression network analysis, we uncovered 16 modules according to similarity in expression patterns. Asparagine synthetase and inorganic pyrophosphatase were considered two hub genes in two modules, which were associated with nitrogen metabolism and phosphorus metabolism, respectively. The expression characteristics of these genes may explain the regulation of morphological, physiological and other related metabolic strategies harmoniously. This multifaceted study provides valuable insights to further understand the mechanism of nitrogen metabolism and to guide utilization of paper mulberry.

scholarly journals Nitrogenous Compounds from the Antarctic Fungus Pseudogymnoascus sp. HSX2#-11

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2636
Author(s):  
Ting Shi ◽  
Li Zheng ◽  
Xiang-Qian Li ◽  
Jia-Jia Dai ◽  
Yi-Ting Zhang ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Methyl Ester ◽  
Pathogenic Fungus ◽  
Acid Methyl Ester ◽  
Detailed Comparison ◽  
Pyridine Derivative ◽  
Systematic Research ◽  
Nitrogenous Compounds ◽  
Acid Methyl ◽  
The Antarctic

The species Pseudogymnoascus is known as a psychrophilic pathogenic fungus which is ubiquitously distributed in Antarctica. While the studies of its secondary metabolites are infrequent. Systematic research of the metabolites of the Antarctic fungus Pseudogymnoascus sp. HSX2#-11 led to the isolation of one new pyridine derivative, 4-(2-methoxycarbonyl-ethyl)-pyridine-2-carboxylic acid methyl ester (1), together with one pyrimidine, thymine (2), and eight diketopiperazines, cyclo-(dehydroAla-l-Val) (3), cyclo-(dehydroAla-l-Ile) (4), cyclo-(dehydroAla-l-Leu) (5), cyclo-(dehydroAla-l-Phe) (6), cyclo-(l-Val-l-Phe) (7), cyclo-(l-Leu-l-Phe) (8), cyclo-(l-Trp-l-Ile) (9) and cyclo-(l-Trp-l-Phe) (10). The structures of these compounds were established by extensive spectroscopic investigation, as well as by detailed comparison with literature data. This is the first report to discover pyridine, pyrimidine and diketopiperazines from the genus of Pseudogymnoascus.

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