Phenolic compounds and oxidative metabolism in green bean plants under nitrogen toxicity.

2000 ◽  
Vol 27 (10) ◽  
pp. 973 ◽  
Author(s):  
Esteban Sánchez ◽  
Juan M. Soto ◽  
Pablo C. García ◽  
Luis R. López-Lefebre ◽  
Rosa M. Rivero ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Hydrogen Peroxide ◽  
Superoxide Dismutase ◽  
Abiotic Stress ◽  
Phenolic Compounds ◽  
Phaseolus Vulgaris ◽  
Phenylalanine Ammonia Lyase ◽  
Green Bean ◽  
Phaseolus Vulgaris L ◽  
Bean Plants

The objective of the present work was to determine the effect of nitrogen toxicity on the metabolism of phenolic compounds and of oxidative stress in Phaseolus vulgaris L. cv. Strike. The nitrogen was applied to the nutrient solution as NH4NO3 at 5.4, 10.8, 16.2, 21.6 and 27 mM. The results indicate that the application of 27 mM N can be defined as toxic, as it drastically depressed growth of the green bean plants in our experiment. In addition, the abiotic stress from the application of this N dosage inhibited the enzymes polyphenol oxidase, peroxidase and cata-lase, and stimulated phenylalanine ammonia-lyase and superoxide dismutase activities. The result was foliar accumulation of phenolic compounds and hydrogen peroxide (H2O2). The accumulation of H2O2 also apparently caused a reduction in biomass production.

Proline metabolism in response to highest nitrogen dosages in green bean plants (Phaseolus vulgaris L. cv. Strike)

2001 ◽  
Vol 158 (5) ◽  
pp. 593-598 ◽  
Author(s):  
Esteban Sánchez ◽  
Luis Ramón López-Lefebre ◽  
Pablo Carlos García ◽  
Rosa María Rivero ◽  
Juan Manuel Ruiz ◽  
...  
Keyword(s):  
Phaseolus Vulgaris ◽  
Green Bean ◽  
Proline Metabolism ◽  
Phaseolus Vulgaris L ◽  
Bean Plants

scholarly journals Soil Application of Effective Microorganisms (EM) Maintains Leaf Photosynthetic Efficiency, Increases Seed Yield and Quality Traits of Bean (Phaseolus vulgaris L.) Plants Grown on Different Substrates

2019 ◽  
Vol 20 (9) ◽  
pp. 2327 ◽  
Author(s):  
Marcello Iriti ◽  
Alessio Scarafoni ◽  
Simon Pierce ◽  
Giulia Castorina ◽  
Sara Vitalini
Keyword(s):  
Phaseolus Vulgaris ◽  
Photosystem Ii ◽  
Sandy Soil ◽  
Photosynthetic Efficiency ◽  
Quality Traits ◽  
Phaseolus Vulgaris L ◽  
Effective Microorganisms ◽  
Yield And Quality ◽  
Bean Plants

EM (effective microorganisms) is a biofertilizer consisting of a mixed culture of potentially beneficial microorganisms. In this study, we investigated the effects of EM treatment on leaf in vivo chlorophyll a fluorescence of photosystem II (PSII), yield, and macronutrient content of bean plants grown on different substrates (nutrient rich substrate vs. nutrient poor sandy soil) in controlled environmental conditions (pot experiment in greenhouse). EM-treated plants maintained optimum leaf photosynthetic efficiency two weeks longer than the control plants, and increased yield independent of substrate. The levels of seed nutritionally-relevant molecules (proteins, lipids, and starch) were only slightly modified, apart from the protein content, which increased in plants grown in sandy soil. Although EM can be considered a promising and environmentally friendly technology for sustainable agriculture, more studies are needed to elucidate the mechanism(s) of action of EM, as well as its efficacy under open field conditions.

scholarly journals Oxidation of glycine by Phaseolus leghaemoglobin with associated catabolic reactions at the haem

1978 ◽  
Vol 176 (2) ◽  
pp. 351-358 ◽  
Author(s):  
P Lehtovaara
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Monoxide ◽  
Superoxide Dismutase ◽  
Phaseolus Vulgaris ◽  
Initial Velocity ◽  
Root Nodules ◽  
Green Product ◽  
Oxygen Complex ◽  
Optimum Ph ◽  
Glycine Oxidase

Leghaemoglobin from the root nodules of kidney bean (Phaseolus vulgaris) reacts in alkaline glycine solutions as a glycine oxidase in a reaction that may also be regarded as a coupled oxidation. Leghaemoglobin is reduced to the ferrous form by glycinate, the oxygen complex is formed, and finally the haem is attacked to yield a green reaction product. Glycine is simultaneously oxidized to glyoxylate, and hydrogen peroxide is generated. The initial velocity of the formation of the green product is proportional to the concentrations of leghaemoglobin and glycine, and the optimum pH for the reaction is 10.2. The green product is not formed if carbon monoxide, azide of imidazole is bound to the haem, whereas oxidation of glycine to glyoxylate is not inhibited by azide and not essentially by carbon monoxide. Haem breakdown is activated by digestion of leghaemoglobin by carboxypeptidase, and partly inhibited by catalase and superoxide dismutase.

scholarly journals Investigations on the pathogenicity of Helminthosporium sorokinianum Sacc. in relation to Phaseolus vulgaris L.

2014 ◽  
Vol 10 (2) ◽  
pp. 283-293
Author(s):  
Barbara Łacicowa ◽  
Zofia Machowicz
Keyword(s):  
Phaseolus Vulgaris ◽  
Root System ◽  
Field Experiments ◽  
Phaseolus Vulgaris L ◽  
Bean Plants ◽  
Before And After

The results obtained in pot and field experiments have shown that <i>Helminthosporium sorokinianum</i> is able to infect bean plants. The cotyledons and roots of shoots during the first three weeks of growth are attacked the most frequently. Dark brown spots occur on the above-mentined organs. The infection of roots and cotyledonsof shoots is responsible for gangrene both before and after germination. Infected plants which remain alive only show symptoms of infection in the root system. The infection of roots by <i>H. sorokinianum</i> in older plants is detromental to growth and causes a decrease in the vield obtained from bean plants.

scholarly journals Redox Status in Women with Rheumathoid Arthritis

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Aleksandra Vranic ◽  
Aleksandra Antovic ◽  
Nevena Draginic ◽  
Marijana Andjic ◽  
Marko Ravic ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Oxidative Stress ◽  
Hydrogen Peroxide ◽  
Lipid Peroxidation ◽  
Superoxide Dismutase ◽  
Cartilage Damage ◽  
Thiobarbituric Acid ◽  
Antioxidant Defense System ◽  
Redox Status ◽  
Female Population

Abstract The aim of this study was to assess oxidative status and to set baseline characteristics for female population with established rheumatoid arthritis. Total of 42 patients with rheumatoid arthritis and 48 age- and sex-matched controls were included in the study. Clinical examination was performed and assessed disease activity. Peripheral blood samples were used for all the assays. The markers of oxidative stress were assessed, including plasma levels of index of lipid peroxidation - thiobarbituric acid reactive substances, hydrogen peroxide, superoxide anion radical, nitrites and activity of superoxide dismutase, catalase and reduced glutathione levels as antioxidant parameters. In the patients group, levels of hydrogen peroxide and index of lipid peroxidation were higher than in controls. Patients with rheumatoid arthritis had decreased superoxide dismutase and catalase activity compared to healthy subjects. Interestingly, controls had higher levels of nitrites compared to patients. Patients showed a marked increase in reactive oxygen species formation and lipid peroxidation as well as decrease in the activity of antioxidant defense system leading to oxidative stress which may contribute to tissue and cartilage damage and hence to the chronicity of the disease.

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