scholarly journals Morpho-physiological Characteristics of Basil (Ocimum basilicum L.) under NaCl-stress and Rhizophagus fasciculatum as NaCl-stress Mitigator

2019 ◽  
Vol 47 (4) ◽  
pp. 1285-1292
Author(s):  
Yuneisy Milagro AGÜERO-FERNÁNDEZ ◽  
Luis Guillermo HERNÁNDEZ-MONTIEL ◽  
Bernardo MURILLO-AMADOR ◽  
José Manuel MAZÓN-SUÁSTEGUI ◽  
Carlos Michel OJEDA-SILVERA ◽  
...  
Keyword(s):  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Nacl Stress ◽  
Ocimum Basilicum ◽  
Control Group ◽  
Digital Object Identifier ◽  
Nacl Concentration ◽  
Relative Water ◽  
Cultivated Species ◽  
Positive Effect

Salinity stress is one of the main problems limiting growth and development of cultivated species. The objective of this study was to assess NaCl-stress basil plants (Ocimum basilicum L.) cv. ‘Nufar’ and to determine whether the mitigating effect of an arbuscular mycorrhizal fungus strain (AMF). A completely randomized factorial design was used considering three NaCl concentration (0, 50 and 100 mM) as factor 1 and presence or absence of AMF (0 and 10 g of inoculum) as factor 2, with four replicates per treatment and four plants per repetition. The assessed response variables were, fresh and dry of aerial part and root, root length, leaf area, relative water content, water potential, plant height, number of spores and mycorrhizal colonization percentage after 20 and 50 days (T20, T50) of the experiment. The results showed greater values in all variables in the control group (0 mM NaCl) than in plants inoculated with R. fasciculatum with T20 and T50; although values decreased as NaCl concentration increased; the tendency to increase was maintained even in at 50 and 100 mM of NaCl with AMF with respect to 50 and 100 mM NaCl without AMF. The AMF colonization percentage decreased as NaCl concentration increased. Nonetheless, the development and growth response for all variables in the inoculated plants with AMF was greater vs non-inoculated, which suggests that basil plant inoculation with AMF has a positive effect in mitigating NaCl stress.   ********* In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue. *********

scholarly journals Improved tolerance of wheat plants (Triticum aestivum L.) to drought stress and rewatering by the arbuscular mycorrhizal fungus Glomus claroideum: effect on growth and cell membrane stability

2008 ◽  
Vol 20 (1) ◽  
pp. 29-37 ◽  
Author(s):  
José Beltrano ◽  
Marta G. Ronco
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Dry Weight ◽  
Leaf Chlorophyll ◽  
Severe Water Stress ◽  
Relative Water ◽  
Mycorrhizal Plants ◽  
Total Dry Weight

The aim of this paper was to investigate the contribution of the arbuscular mycorrhizal fungus Glomus claroideum to drought stress tolerance in wheat plants grown under controlled conditions in a growth chamber, and subjected to moderate or severe water stress and rewatering. Water stress tolerance was determined through total dry weight, leaf relative water content, leakage of solutes and leaf chlorophyll and protein concentrations in mycorrhizal and non-mycorrhizal wheat plants. Total dry weight and leaf chlorophyll concentrations were significantly higher in mycorrhizal plants after moderate or severe water stress treatments compared with non-mycorrhizal ones. Electrolyte leakage was significantly lower in water-stressed inoculated plants. Compared to non-inoculated plants, leaf relative water content and total protein concentration of inoculated individuals increased only under severe water stress. When irrigation was re-established, mycorrhizal plants increased their total dry weight and leaf chlorophyll concentration, and recovered cell membrane permeability in leaves compared with non-mycorrhizal plants. In conclusion, root colonization by G. claroideum could be an adequate strategy to alleviate the deleterious effects of drought stress and retard the senescence syndrome in wheat.

scholarly journals Seed exudates of Sesbania virgata (Cav.) Pers. stimulate the asymbiotic phase of the arbuscular mycorrhizal fungus Gigaspora albida Becker & Hall

Hoehnea ◽  
2019 ◽  
Vol 46 (1) ◽  
Author(s):  
Leilyane C.S. Coelho ◽  
Daiane S.B. Mignoni ◽  
Fábio S.B. Silva ◽  
Márcia R. Braga
Keyword(s):  
Secondary Metabolites ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Mycelial Growth ◽  
Arbuscular Mycorrhizal Fungus ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Sesbania Virgata ◽  
Positive Effect ◽  
Gigaspora Albida

ABSTRACT Sesbania virgata is a legume used in the restoration of degraded areas and forms a symbiosis with arbuscular mycorrhizal fungi (AMF). Its seeds exude secondary metabolites that may influence the colonization by AMF. In this work, we studied the effects of seed (SE) and root exudates (RE) of S. virgata on the asymbiotic phase of Gigaspora albida. Spores of G. albida were germinated in medium supplemented with different concentrations of SE or RE. After seven days, spore germination was stimulated (46.6%) in the medium supplemented with the highest concentration of SE, while the mycelial growth was stimulated with the lowest SE concentration. In turn, RE had no effect on the fungal asymbiotic phase. We concluded that SE exert a positive effect on the asymbiotic phase of G. albida and that the different effects between SE and RE of S. virgata can be explained by their distinct content of secondary metabolites.

scholarly journals Effect of the fertilization and growth promoting microrganisms on Schizolobium parahyba

2019 ◽  
Vol 40 (5) ◽  
pp. 1747
Author(s):  
Vanessa Fogaça de Freitas Duin ◽  
Gabriel Liuti ◽  
Naimara Vieira do Prado ◽  
Martha Viviana Torres Cely ◽  
Matheus Felipe de Lima Andreata ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungus ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Low Fertility ◽  
Schizolobium Parahyba ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Positive Effect ◽  
Rhizobium Sp ◽  
Plant Length

The objective of this work was to evaluate the effect of the chemical and biological fertilizing on the development of two varieties of Schizolobium parahyba, paricá and guapuruvú. The chemical fertilizer NPK 20-05-20 and the plant growth promoting microorganisms, Rhizobium sp. (Rhi) and Rhizophagus clarus (Arbuscular Mycorrhizal Fungus - AMF). The experimental design was a randomized complete block with five replicates and eight treatments. Forty-six day old seedlings of each variety were planted in pits containing hydroretent gel. Then the treatments were added: 1. Control; 2. Rhi; 3. AMF; 4. NPK; 5. Rhi + NPK; 6. Rhi + AMF; 7. AMF + NPK; 8. Rhi + AMF + NPK. Plant length, stem diameter and survival in the environment were evaluated. The ANOVA followed by the Duncan test (? = 0,05) was used to compare the means of the treatments. In the four evaluated periods (37, 111, 250 and 360 days), both varieties had a positive effect on height, diameter and survival when applied to NPK treatments. The interaction AMF and Rhizobium sp. favored the growth in diameter of the guapuruvú. For paricá variety that same treatment provided higher growth in height, however, AMF impaired development in diameter of this variety. Thus, it was observed that under low fertility conditions, the interaction AMF + Rhi favored a greater resistance of guapuruvú to abiotic stress compared to treatment 3, and the presence of grasses in the experimental area may have contributed to the reduction on the development of S. parahyba.

scholarly journals Influence of Salt Stress on Seed Germination and Agro-morphological Traits in Chickpea (Cicer arietinum L.)

2021 ◽  
Author(s):  
Munqez J.Y. Shtaya ◽  
Heba Al-Fares ◽  
Tawfiq Qubbaj ◽  
Hassan Abu-Qaoud ◽  
Faisal Shraim
Keyword(s):  
Nacl Stress ◽  
Germination Percentage ◽  
Peat Moss ◽  
Control Group ◽  
Fresh Weight ◽  
Shoot Ratio ◽  
Root Shoot Ratio ◽  
Nacl Concentration ◽  
National University ◽  
Chickpea Cultivars

Background: The experiment was conducted at the Faculty of Agriculture and Veterinary Medicine, An-Najah National University, Palestine under growth chamber and greenhouse conditions. Methods: To study the effect of NaCl on germination, fifty seeds in each treatment for each cultivar were germinated on a filter paper in petri dishes moistened with the different NaCl concentration levels (0.0, 50 and 100 mM ). To study the effect of NaCl on plant growth and productivity, 2 seeds per variety were grown in 10 liter pots filled with peat moss-sand. Pots were irrigated with the different NaCl levels. Result: The tested Chickpea cultivars showed different tolerance levels in response to NaCl stress levels. NaCl reduced final germination percentage (FGP) and germination index (GI). The highest plant height was obtained by Einalbeda (38.63 cm) in the control group, while the lowest one was found in Arij (28.25 cm) under 100 mM NaCl. NaCl did not affect root/shoot ratio in all genotypes. Reduction in fresh weight ranged between 25.6 and 74.2% under 50 and 100 mM NaCl.

scholarly journals The Arbuscular Mycorrhizal Fungus Rhizophagus Clarus Improve Physiological Tolerance to Drought Stress in Soybean Plants

2021 ◽  
Author(s):  
Thales Caetano Oliveira ◽  
Juliana Silva Rodrigues Cabral ◽  
Leticia Rezende Santana ◽  
Germanna Gouveia Tavares ◽  
Luan Dionísio Silva Santos ◽  
...  
Keyword(s):  
Water Deficit ◽  
Mycorrhizal Fungi ◽  
Mycorrhizal Fungus ◽  
Arbuscular Mycorrhizal ◽  
Development Stage ◽  
Thermal Dissipation ◽  
Control Group ◽  
Physiological Tolerance ◽  
Rhizophagus Clarus ◽  
Soybean Plants

Abstract Soybean (Glycine max L.) is an economically important crop worldwide. However, increasingly long periods of drought have reduced the productivity of this crop. Studies have shown that inoculation with arbuscular mycorrhizal fungi (AMF) provides a potential alternative strategy for mitigating drought. In the present study, we measured the physiological and morphological performance of two soybean cultivars under drought in symbiosis with Rhizophagus clarus. Soybean plants Anta82 and Desafio, were grown in pots previously inoculated with R. clarus. Water deficit (WD) was imposed at the V3 development stage and maintained for 7 days. A control group was performed in parallel with well-irrigated plants in the absence of R. clarus in a greenhouse. Three and seven days after the WD imposition the analysis were performed. Cultivar Anta82 showed a higher percentage of colonization, N and K leaf content, whereas Desafio, showed higher water potential, water-use efficiency under WD, and thermal dissipation that allowed higher values for Fv/Fm, A, and PH under WD+AMF. The Principal Components Analysis results were able to demonstrate that both cultivars in water deficit with AMF colonization clustered together with well-watered plants. These findings suggest that AMF had an effect on plants in order to reduce drought physiological impairment.

Соматические дисфункции у детей с задержкой речи

2017 ◽  
pp. 61-65
Author(s):  
E. L. Kuznetsova ◽  
L. A. Dultsev ◽  
E. V. Safin
Keyword(s):  
Standard Treatment ◽  
Control Group ◽  
Complex Therapy ◽  
Osteopathic Treatment ◽  
Positive Effect ◽  
Experimental Group

Goal of research - the study aims to examine the osteopathic profi le of children with dysarthria and to develop recommendations for osteopathic correction of somatic dysfunctions in 2-3 year old children presenting this pathology.Materials and methods. 30 2-3 year old children with the symptoms of dysarthria took part in the research. All the children were divided into 2 groups: the control group of 15 children received standard treatment, and the experimental group of 15 children received both standard and osteopathic treatment. The dysarthria severity and the osteopathic profi le were evaluated with account of the number of somatic dysfunctions at global, regional, and local levels.Results. The osteopathic correction was shown to have a positive effect on dysarthria severity. The study established a correlation between the dysarthria severity in children and the number of somatic dysfunctions at the local level.Conclusion. The study suggests using osteopathic correction of somatic dysfunctions in the complex therapy of dysarthria in children.

Pragmatic instruction in L2-Russian

2020 ◽  
Vol 4 (1) ◽  
pp. 62-95
Author(s):  
Daniele Artoni ◽  
Valentina Benigni ◽  
Elena Nuzzo
Keyword(s):  
Foreign Language ◽  
Speech Acts ◽  
Control Group ◽  
Written Discourse ◽  
Instructional Treatment ◽  
Completion Task ◽  
Positive Effect ◽  
Experimental Group ◽  
National Corpus ◽  
Pragmatic Instruction

Over the last three decades, a growing number of studies have investigated the effects of instruction on the acquisition of pragmatic features in L2. The bulk of this research has focused mainly on the teaching of English as a second/foreign language. However, instructional pragmatic studies in L2-Russian are lacking. The main purpose of our study is to contribute towards filling this gap by analysing the effects of pragmatic instruction on the acquisition of two speech acts by Italian learners of Russian. Furthermore, we aim to explore whether the Multimodal Russian Corpus (MURCO), a multimedia subcorpus of the Russian National Corpus, can be an effective tool for teaching speech acts in L2-Russian. Our research was composed of one experimental group (n = 18) and one control group (n = 11); each was composed of two intact classes of Italian university students at an intermediate level of L2-Russian, who were pre- and post-tested using a written discourse completion task. The experimental group was subjected to a programme of pragmatic instruction – eight thirty-minute MURCO-based lessons devoted to requests and advice, while the control group was taught according to the standard syllabus, that is, with no pragmatic instruction. The results revealed that the use of the target pragmatic features varied significantly in the experimental group, but not in the control group, thus showing a general positive effect of the instructional treatment based on the MURCO corpus. However, some limitations were identified with regard to the usability of this tool by teachers and learners.

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