scholarly journals ÁCIDO ASCÓRBICO, UMA ALTERNATIVA PARA MINIMIZAR OS EFEITOS DA DEFICIÊNCIA HÍDRICA EM RABANETE

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 79-91
Author(s):  
Osvaldir Feliciano Dos Santos ◽  
FERNANDO BROETTO ◽  
DARIANE PRISCILA FRANCO DE OLIVEIRA ◽  
ÍCARO MONTEIRO GALVÃO ◽  
MARA LÚCIA CRUZ DE SOUZA ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Water Stress ◽  
Experimental Design ◽  
Raphanus Sativus ◽  
Foliar Application ◽  
Photosynthetic Parameters ◽  
Physiological Effects ◽  
Water Deficiency ◽  
Central Hypothesis ◽  
Water Depths

ÁCIDO ASCÓRBICO, UMA ALTERNATIVA PARA MINIMIZAR OS EFEITOS DA DEFICIÊNCIA HÍDRICA EM RABANETE     OSVALDIR FELICIANO DOS SANTOS1; FERNANDO BROETTO2; DARIANE PRISCILA FRANCO DE OLIVEIRA3; ÍCARO MONTEIRO GALVÃO4; MARA LÚCIA CRUZ DE SOUZA5 E JOSIANA JUSSARA NAZARÉ BASÍLIO6   1Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas FCA/UNESP, Botucatu / SP – Brasil. CEP: 18610-034, [email protected] 2Departamento de Química e Bioquímica, Instituto de Biociências, IB/UNESP, Botucatu / SP – Brasil. CEP: 18618-000, [email protected]. 3Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas FCA/UNESP, Botucatu / SP – Brasil. CEP: 18610-034, [email protected]. 4Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas FCA/UNESP, Botucatu / SP – Brasil. CEP: 18610-034, [email protected]. 5Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas FCA/UNESP, Botucatu / SP – Brasil. CEP: 18610-034, [email protected]. 6Instituto de Ciências Agrárias ICA/UFMG, Montes Claros / MG – Brasil. CEP: 39404-547, [email protected]     1 RESUMO   Neste ensaio objetivou-se avaliar os efeitos fisiológicos do cultivo de rabanete sob diferentes lâminas de água, simulando a deficiência hídrica (DH). A hipótese central do ensaio seria identificar se a aplicação foliar exógena de ácido ascórbico atenuaria os efeitos fisiológicos dessa deficiência. O delineamento experimental foi em blocos ao acaso em esquema de parcelas subdivididas. Aplicou-se duas tensões de água no solo (10 e 30 kPa) e nas subparcelas, cinco concentrações de ácido ascórbico em solução aquosa (0, 250, 500, 750 e 1000 ppm) com quatro repetições. Verificou-se que a DH alterou os padrões de parâmetros fotossintéticos sendo que, a aplicação foliar de ácido ascórbico promoveu incremento significativo destas variáveis principalmente quando as plantas estavam submetidas ao estresse. Em relação aos tratamentos com a vitamina, maiores valores de taxa fotossintética foram obtidos com a aplicação de 675,8 e 837,3 ppm, nas tensões de 10 e 30 kPa respectivamente aos 30 dias após a emergência (DAE). Com base nos resultados, conclui-se que a aplicação de ácido ascórbico apresenta potencial para atenuar os efeitos da DH em plantas de rabanete.   Palavras-chave: Raphanus sativus, vitaminas, estresse hídrico, fotossíntese.     SANTOS, O. F.; BROETTO, F.; OLIVEIRA, D. P. F.; GALVÃO, I. M.; SOUZA, M. L. C.; BASÍLIO, J. J. N. ASCORBIC ACID, AN ALTERNATIVE TO MINIMIZE THE EFFECTS OF WATER DEFICIENCY IN RADISH           2 ABSTRACT   The aim of this study was to evaluate the physiological effects of radish cultivation under different water depths, simulating water deficiency (WD). The central hypothesis of the assay was to assess whether the exogenous foliar application of ascorbic acid could attenuate the physiological effects of this deficiency. The experimental design was a randomized complete block in subdivided plots. Two soil water potentials (10 and 30 kPa) were applied on plots, and the different concentrations of ascorbic acid (0, 250, 500, 750 and 1000 ppm) on the subplots, with four replications. It was verified that WD changes the patterns of photosynthetic parameters, and that the foliar application of ascorbic acid promoted a significant increase of these variables, especially when plants were submitted to stress. With regard to treatments with the vitamin, higher values ​​of photosynthetic rate were obtained with the application of 675.8 and 837.3 ppm, in the tensions of 10 and 30 kPa respectively 30 days after emergency (DAE). Based on the results, it was concluded that the application of ascorbic acid has potential to mitigate the physiological effects of WD on radish plants.   Keywords: Raphanus sativus, vitamins, water stress, photosynthesis.

scholarly journals Promotion of Growth and Physiological Characteristics in Water-Stressed Triticum aestivum in Relation to Foliar-Application of Salicylic Acid

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1316
Author(s):  
Abida Parveen ◽  
Muhammad Arslan Ashraf ◽  
Iqbal Hussain ◽  
Shagufta Perveen ◽  
Rizwan Rasheed ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Salicylic Acid ◽  
Antioxidant Enzymes ◽  
Water Stress ◽  
Photosynthetic Pigments ◽  
Foliar Spray ◽  
Field Capacity ◽  
Available Water ◽  
Drought Tolerant ◽  
Growth Attributes

The present work reports the assessment of the effectiveness of a foliar-spray of salicylic acid (SA) on growth attributes, biochemical characteristics, antioxidant activities and osmolytes accumulation in wheat grown under control (100% field capacity) and water stressed (60% field capacity) conditions. The total available water (TAW), calculated for a rooting depth of 1.65 m was 8.45 inches and readily available water (RAW), considering a depletion factor of 0.55, was 4.65 inches. The water contents corresponding to 100 and 60% field capacity were 5.70 and 1.66 inches, respectively. For this purpose, seeds of two wheat cultivars (Fsd-2008 and S-24) were grown in pots subjected to water stress. Water stress at 60% field capacity markedly reduced the growth attributes, photosynthetic pigments, total soluble proteins (TSP) and total phenolic contents (TPC) compared with control. However, cv. Fsd-2008 was recorded as strongly drought-tolerant and performed better compared to cv. S-24, which was moderately drought tolerant. However, water stress enhanced the contents of malondialdehyde (MDA), hydrogen peroxide (H2O2) and membrane electrolyte leakage (EL) and modulated the activities of antioxidant enzymes (superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), as well as accumulation of ascorbic acid (AsA), proline (Pro) and glycine betaine (GB) contents. Foliar-spray with salicylic acid (SA; 0, 3 mM and 6 mM) effectively mitigated the adverse effects of water stress on both cultivars. SA application at 6 mM enhanced the shoot and root length, as well as their fresh and dry weights, and improved photosynthetic pigments. SA foliage application further enhanced the activities of antioxidant enzymes (SOD, POD, and CAT) and nonenzymatic antioxidants such as ascorbic acid and phenolics contents. However, foliar-spray of SA reduced MDA, H2O2 and membrane permeability in both cultivars under stress conditions. The results of the present study suggest that foliar-spray of salicylic acid was effective in increasing the tolerance of wheat plants under drought stress in terms of growth attributes, antioxidant defense mechanisms, accumulation of osmolytes, and by reducing membrane lipid peroxidation.

scholarly journals Change of Ascorbic Acid Level after Grafting of Tomato Seedlings

1999 ◽  
Vol 54 (9-10) ◽  
pp. 830-833 ◽  
Author(s):  
Akira Wadano ◽  
Mitsuharu Azeta ◽  
Shin-ichi Itotani ◽  
Ai Kanda ◽  
Toshio Iwaki ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Water Stress ◽  
Ascorbate Peroxidase ◽  
Phosphate Buffer ◽  
Acid Level ◽  
Active Oxygen ◽  
Ascorbic Acid Level ◽  
Electrochemical Detector ◽  
Tomato Seedlings ◽  
Severe Water Stress

Grafting is an easy way to produce a new seedling, which can tolerate against various stresses. During the acclimation after grafting, however, the seedlings still suffer a severe water stress. It is well known that water stress produces active oxygen to oxidize ascorbic acid. The concentration of ascorbic acid in the leaves was analyzed by HPLC equipped with an electrochemical detector. The column used was SP-120-5-ODS-BP (DAISO, JAPAN) and elution was performed with 0.1 ᴍ phosphate buffer, pH 3.0. After grafting the seedlings were acclimated under a 6-hr light/dark regimen. The content of ascorbic acid increased gradually during 2 days compared with control. The ascorbate peroxidase showed about constant activity, so the increase of ascorbic acid may be due to its requirement to cure the grafting

Effect of water stress and NaCl triggered changes on yield, physiology, biochemistry of broad bean (Vicia faba) plants and on quality of harvested pods

Biologia ◽  
2014 ◽  
Vol 69 (8) ◽  
Author(s):  
Georgia Ouzounidou ◽  
Ilias Ilias ◽  
Anastasia Giannakoula ◽  
Ioanna Theoharidou
Keyword(s):  
Water Stress ◽  
Field Experiments ◽  
Broad Bean ◽  
Foliar Application ◽  
Water Control ◽  
Simultaneous Exposure ◽  
Ameliorative Effect ◽  
Normal Water ◽  
The Impact

AbstractSalinity and drought are the most important abiotic stresses affecting crop yield. Broad bean was chosen as model plant for assessing the impact of salt stress and its interaction with drought in the field experiments. The factors examined in the experiments were the two irrigation rates (normal watering — NW with 3 L plant−1 and drought — D) and three salinity rates imposed by foliar application (0, 50, 100 mg L−1 NaCl). Highest NaCl level with normal water irrigation caused maximum reduction in plant height and production, which it was due to photosynthetic disturbances. Salt injuries were alleviated by increasing water stress. The control plants exposed to NaCl lost their ability over water control. The increased malondialdehyde (MDA) and H2O2 indicate the prevalence of oxidative stress due to salinity. The levels of proline and carbohydrates were higher under salinity alone than under simultaneous exposure to drought and NaCl. The protein concentration of immature and mature broad bean pods was more inhibited more by NaCl supply than by drought alone. The combination of drought and NaCl resulted in a significant increase in proteins, glucose, fructose and sucrose content. Overall, the ameliorative effect of drought under NaCl supply was quantified.

scholarly journals Effects of Irrigation Deficit and Application of Some Growth Regulators on Defense Mechanisms of Canola

2015 ◽  
Vol 43 (1) ◽  
pp. 124-130 ◽  
Author(s):  
Seyed Ahmad KALANTAR AHMADI ◽  
Ali EBADI ◽  
Jahanfar DANESHIAN ◽  
Soodabeh JAHANBAKHSH ◽  
Seyed Ataollah SIADAT ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Deficit Irrigation ◽  
Defense Mechanisms ◽  
Agricultural Research ◽  
Foliar Application ◽  
Maximum Activity ◽  
Flowering Stage ◽  
Relative Water ◽  
Irrigation Deficit ◽  
Main Factor

A split-plot experiment arranged in a randomized complete blocks design with three replications was carried out in Safiabad Agricultural Research Center of Dezful in order to investigate the effects of foliar applications of ascorbic acid (AsA), salicylic acid (SA) and methanol (Me), under deficit irrigation conditions, in canola; there were 3 levels of irrigation as the main factor (irrigation after 70 mm evaporation from the pan as control, cessation of irrigation at the flowering stage and cessation of irrigation at the appearance of siliques) and 10 levels of foliar applications as sub-factor (100, 200 and 300 mg.l-1AsA; 100, 200 and 300 µM SA; 10, 20 and 30% (w/v) methanol; and foliar application of distilled water as control). Foliar applications were made during both budding and initiation of flowering stages. Results indicated that antioxidant enzymes showed different responses to deficit irrigation and foliar application treatments. Maximum catalase (CAT) and polyphenol oxidase (PPO) activities were observed under cessation of irrigation at flowering stage and foliar application of 300 µM SA, while ascorbate peroxidase (APX) reached its maximum activity under the same irrigation conditions and foliar application of 300 mg.l-1AsA. SA had more influence to increase in CAT and PPO activity under cessation of irrigation at flowering stage. The relative water content (RWC) was also decreased due to the drought stress caused by the cessation of irrigation. Foliar application of SA (100 μM) and Me (10% w/v) had more influence to maintain RWC compared to ascorbic acid under irrigation cessation at flowering stage.

Anti-Oxidant Activities, Chemical Attributes and Fruit Yield of Peach Cultivars as Influenced by Foliar Application of Ascorbic Acid

2017 ◽  
Vol 69 (3) ◽  
pp. 113-121 ◽  
Author(s):  
Muhammad Sajid ◽  
Muhammad Ali Khan ◽  
Wasim Bilal ◽  
Abdur Rab ◽  
Zafar Iqbal ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Foliar Application ◽  
Fruit Yield ◽  
Anti Oxidant ◽  
Chemical Attributes
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