scholarly journals Salicylic acid as a mitigator of water stress in black oats seeds

2019 ◽  
pp. 389
Author(s):  
Stela Alves Oliveira ◽  
Angelo Matheus Santos ◽  
Sonivaldo Ruzzene Beltrame ◽  
João Paulo Francisco ◽  
Ana Daniela Lopes
Keyword(s):  
Salicylic Acid ◽  
Water Stress ◽  
Plant Development ◽  
Climatic Factors ◽  
Germination Percentage ◽  
Climate Conditions ◽  
Randomized Design ◽  
Oat Seeds ◽  
Glycol Solution ◽  
The University

Oats are a very popular grass used in crop rotation to provide organic matter, green mass and assist in the natural aeration of the soil. Agronomic factors such as acidity correction and soil fertility adjustments can be controlled, but when it comes to climatic factors, cultivation depends on favorable climate conditions for good plant development. For instance, low rainfall occurrences result in decreased percentage of germination and plant development. Water stress affects plant development. Therefore, this study aimed to evaluate the effect of salicylic acid as a water stress mitigator on black oats. The experiment was carried out in the Laboratory of Molecular Biology and Biotechnology of Products and Microorganisms of the University of Parana. Black oats (Avena strigosa Schreb) seeds were submitted to different imbibition treatments: without imbibition, soaked in distilled water, and soaked in salicylic acid. Then, they were placed in gerbox boxes previously moistened with 6000 polyethylene glycol solution with different osmotic potentials (0.0; -0.2; -0.4; -0.6 and -0.8 MPa). The experiment was conducted in a completely randomized design with four replicates. Ten days after the experiment, the following parameters were evaluated: germination percentage, germination velocity index, shoot length and radicle length. Salicylic acid at the concentration used in this study promotes a mitigating effect of water stress caused by PEG6000, increasing the germination percentage of black oat seeds.

scholarly journals Assessment of Salicylic Acid Impacts on Seedling Characteristic of Cucumber (Cucumis sativus L.) under Water Stress

2012 ◽  
Vol 4 (1) ◽  
pp. 112-115 ◽  
Author(s):  
Hossein MARDANI ◽  
Hassan BAYAT ◽  
Amir Hossein SAEIDNEJAD ◽  
Ehsan Eyshi REZAIE
Keyword(s):  
Salicylic Acid ◽  
Water Stress ◽  
Water Deficit ◽  
Cucumis Sativus ◽  
Foliar Application ◽  
Dry Weight ◽  
Water Deficit Stress ◽  
Cucumis Sativus L ◽  
Water Stress Tolerance ◽  
Randomized Design

Impacts of various concentrations of salicylic acid (SA) on cucumber (Cucumis sativus L.) seedling characteristic were evaluated under different water stress levels by using a factorial arrangement based on completely randomized design with three replications at experimental greenhouse of Ferdowsi University of Mashhad, Iran. The studied factors included three water deficit levels (100% FC, 80% FC, and 60% FC) considered as first factor and five levels of SA concentrations (0, 0.25, 0.5, 0.75, and 1 mM) as second factor. Results showed that foliar application of SA at the highest concentration enhanced leaf area, leaf and dry weight while decreased stomatal conductance under high level of water deficit stress. Though, severe water deficit stress sharply raised the SPAD reading values. In general, exogenous SA application could develop cucumber seedling characteristic and improve water stress tolerance.

scholarly journals IN-VITRO SCREENING OF DIFFERENT TOMATO GENOTYPES AGAINST PEG INDUCED WATER STRESS

2019 ◽  
Vol 4 (3) ◽  
pp. 15
Author(s):  
Muhammad Saqib Naveed ◽  
Ayesha Manzoor ◽  
Ahsan Javed ◽  
Muhammad Azeem Tariq
Keyword(s):  
Water Stress ◽  
Growth Parameters ◽  
Germination Percentage ◽  
Shoot Length ◽  
Growth Stages ◽  
Randomized Design ◽  
Seedling Biomass ◽  
Root And Shoot Length ◽  
Tomato Genotypes

Tomato (Lycopersicum esculentum L.) is one of the most economically important plants in the Solanaceae family. Water scarcity is one of the major climatic constraints which is affecting all crops including tomato in the world. Selection of water stress tolerant cultivars is an important strategy to overcome this problem. Therefore the present research was conducted to determine the effect PEG induced water stress on germination percentage and early growth stages of tomato seedlings. Fifteen different tomato genotypes were screened under in-vitro conditions using two different concentrations of PEG (2% and 4%). The experiment was arranged in a completely randomized design (CRD) with three replications. Parameters like germination percentage (%), root length (cm), shoot length (cm) and seedling biomass (g) were recorded during the experiment. Results indicated that PEG induced water stress significantly reduced germination percentage (%) and other growth parameters in drought susceptible tomato genotypes (RUS-1, Rustam, R-2017, Pakit, 17904, Kashmiri, Kiara, Avinash, and K.K.2). Whereas in other genotypes “R. Wonder, Naqeeb, Rio grande, T-4, Patfeeder and Nagina” all parameters increase with an increase in PEG concentration. However among these genotypes, “Patfeeder” exhibited highest germination percentage (100 %) with maximum root and shoot length and seedling biomass at highest PEG concentration 4%. Based on experimental results, “Patfeeder” was considered a drought tolerant genotype due to its better performance in different levels of water stress.

scholarly journals Germplasm Bred for Resistance to Striga hermonthica Exhibited High Resistance Levels to Striga asiatica Compared to Commercial Checks

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Vimbayi Dhliwayo ◽  
Edmore Gasura ◽  
Cacious Stanford Nyakurwa ◽  
Stanford Mabasa ◽  
Arnold Bray Mashingaidze ◽  
...  
Keyword(s):  
Germination Percentage ◽  
Plant Production ◽  
Striga Hermonthica ◽  
International Institute ◽  
Striga Asiatica ◽  
Lattice Design ◽  
Randomized Design ◽  
Sub Saharan ◽  
The University ◽  
University Of Zimbabwe

Parasitic weeds belonging to the Orobanchaceae family are a menace in Sub-Saharan African (SSA). Specifically, the two witchweeds from the genus Striga, S. hermonthica and S. asiatica, are jointly responsible for land abandonments and cereal yield reductions in the SSA. Factorial experiments involving fourteen maize genotypes and two levels of Striga asiatica infestation (infested and noninfested) were conducted under pot and laboratory experiments at the Department of Plant Production Sciences and Technologies, University of Zimbabwe, during the 2014/2015 season. A 14 × 2 factorial pot experiment was arranged in a 7 × 4 α-lattice design replicated four times, whereas the laboratory agar gel was arranged in a complete randomized design with four replications. Results revealed significant differences ( p  < 0.05) for S. asiatica and genotype main effects for the recorded traits. S. asiatica-infested genotypes had lower biomasses than noninfested ones. However, the University of Zimbabwe bred hybrids such as Ax31, Ax28, Ax7, and Ax32 had similar plant heights and stem, leaf, and cob biomass across the two Striga levels unlike the local checks, particularly SC513, SC537, and SC637, under Striga infestation. Moreover, these genotypes also had the least Striga germination percentage and furthest germination distance indicating that they are resistant/tolerant to Striga asiatica. The University of Zimbabwe bred hybrids, using Striga hermonthica resistance from the International Institute of Tropical Agriculture, exhibited resistance/tolerance to Striga asiatica compared to local checks. Therefore, these varieties could offer a better and viable Striga spp. control option to farmers in both S. hermonthica and S. asiatica endemic areas.

Calculating groundwater stress and climate change-induced vulnerability of karst aquifers on a global scale

2021 ◽  
Author(s):  
Philipp Nußbaum ◽  
Márk Somogyvári ◽  
Christopher Conrad ◽  
Martin Sauter ◽  
Irina Engelhardt
Keyword(s):  
Climate Change ◽  
Water Stress ◽  
Climatic Factors ◽  
Karst Aquifer ◽  
Global Scale ◽  
Stress Index ◽  
Karst Aquifers ◽  
Climate Zones ◽  
Climate Conditions ◽  
Temperature And Precipitation

&lt;p&gt;Approximately 10% of the global population rely on groundwater from karst aquifers. Due to complex karst structures, these aquifers have high infiltration capacities and hydraulic conductivities, which makes them vulnerable to pollution and, as prediction and management are complicated, overexploitation. As populations are growing and demand rises, we assess the current level of groundwater stress in karst aquifers with Mediterranean climates and their vulnerability (defined as the change in groundwater stress) to expected changes in temperature and precipitation on the global scale.&lt;/p&gt;&lt;p&gt;Our approach is based on a Groundwater Stress Index (GSI), which is calculated for 356 karst aquifers (as identified in the World Karst Aquifer Map) that have some of their area located in Mediterranean climate zones (Csa, Csb, and Csc after K&amp;#246;ppen/Geiger). GSI are calculated from seven indicators: groundwater recharge, storage, and abstractions, surface runoff, climatic water balance, water-intensity of crops, and groundwater-dependent ecosystems. Each indicator is spatially and temporally averaged to describe a recent trend on aquifer level, resulting in one complex attribute table for the 356 aquifers. GSI is calculated as the average of the normalized indicators for each aquifer, ranging from 0 (no water stress) to 1 (extreme water stress).&lt;/p&gt;&lt;p&gt;Aquifers are then grouped based on similarities in two classification parameters &amp;#8211; degree of karstification (P1) and land cover (P2). Comparison of aquifers with similar classification parameters allows to focus more directly on the relationship between groundwater stress and climate, disregarding relatively constant influences. For each group (e.g., well-developed karst, primarily agriculturally used), we plot calculated GSI values with current temperature and precipitation data. By investigating four Shared Socioeconomic Pathways (SSPs) until 2100, we identify aquifers that mimic future climate conditions for others with similar P1 and P2. We then measure the difference in groundwater stress accompanied by altered climatic factors. This change is interpreted as vulnerability to climate change.&lt;/p&gt;&lt;p&gt;This approach, which relies on present-day observed conditions, allows us to predict the effect of a changing climate without the need to develop a complex numerical model, which requires large amounts of data and functional understanding of aquifer behavior. While analysis is currently ongoing, we expect both groundwater stress and vulnerabilities to be high. Predicted climate zone shifts by Beck et al. (2018) indicate that, out of 356 karst aquifers with Mediterranean climates, 52 could move to more extreme arid climate zones by 2100.&lt;/p&gt;&lt;p&gt;Results will be visualized in the form of vulnerability maps that may serve as an &amp;#8220;early-warning system&amp;#8221;. For particularly threatened aquifers, we will derive recommendations for more sustainable management by suggesting strategies to lower groundwater stress. This is done by taking a closer look at the aquifer&amp;#8217;s indicator values and identifying factors that currently contribute the most to groundwater stress.&lt;/p&gt;

scholarly journals Germination and early growth of physic nut submitted to levels of salinity

2013 ◽  
Vol 33 (6) ◽  
pp. 1110-1123
Author(s):  
Luiz A. Lima ◽  
Willian F. de Almeida ◽  
Pedro L. T. Lima ◽  
Eduardo C. Oliveira ◽  
Clinton C. Shock
Keyword(s):  
Plant Development ◽  
Germination Percentage ◽  
Physic Nut ◽  
Potential Productivity ◽  
Total Percentage ◽  
Randomized Design ◽  
Affected Plant ◽  
Salinity Levels ◽  
Completely Randomized Design ◽  
Salinity Management

Two experiments were conducted to evaluate the effect of salinity on early physic nut plant development. In the first trial, physic nut seeds were exposed to seven levels of salinity (0, 2, 4, 6, 8, 10 and 12dS m-1) with eight repetitions, using a substrate of paper soaked with solutions of CaCl2 and KCl. The treatments were evaluated based on the initial germination, total percentage of germination, and time necessary to germination of 50% of the seeds. Increased salinity reduced the first germination count and delayed the time to 50% germination. From 10dS m-1, there was a reduction in germination percentage. The second trial evaluated the effect of salinity on the growth of physic nut seeds. This trial, carried out inside a greenhouse, with a completely randomized design, was composed of five salinity treatments (0.02, 2, 4, 6 and 8dS m-1) with 5 replications. It was observed that salinity levels above 2dS m-1 affected plant development. The current study suggests that salinity management is an important factor to be considered to achieve the potential productivity of physic nut.

scholarly journals Physiological potential of piquin pepper seeds in response to pregermination treatments

2021 ◽  
Vol 45 ◽  
Author(s):  
Miguel Ángel Cano-González ◽  
Benjamín Abraham Ayil-Gutiérrez ◽  
Rafael Delgado-Martínez ◽  
Eduardo Osorio-Hernández ◽  
José Antonio Rangel-Lucio ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Salicylic Acid ◽  
Growth Regulators ◽  
Germination Percentage ◽  
Wild Plant ◽  
Naphthalene Acetic Acid ◽  
Distilled Water ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Pharmaceutical Properties

ABSTRACT Wild piquin pepper fruits are consumed and traded because of their flavor, nutritional and pharmaceutical properties. The heterogeneous germination of its seeds has caused pregermination treatments to be unstandardized. Because of that, our goal was to evaluate pregermination treatments of piquin pepper seeds from a wild plant from the municipality of Victoria, Tamaulipas, Mexico, consisting of immersion for different periods (2, 24, 48 h) in solutions with variable concentrations of the growth regulators naphthalene acetic acid (NAA; 0.1, 1.0, 2.5 mM), salicylic acid (SA; 1.0, 5.0, 10 mM), gibberellic acid (GA3, 1.0, 5.0, 10 mM), indole-3-butyric acid (IBA; 1.0, 2.0, 3.0 mM), the commercial product Biozyme (Bioz) containing minerals and growth regulators (Bioz; 0.5, 1, 2%), and sulfuric acid (H2SO4; 2, 5, 10%) in a completely randomized design, using distilled water as the control. For each treatment, we measured the imbibition ratio, germination percentage, time to obtain 50% germination (T50), and coefficient of variation of germination time (CVt). Our results showed that the imbibition was similar in the control and the treatments, but it differed between treatments. The highest imbibition recorded in 48 h was 87%. The highest germination percentage (79.2%) was achieved with 2 h immersion in 2% Bioz, followed by 1 mM NAA (62%) and 5 mM SA (56%). T50 and CVt were 10-26 d and 0-39%, respectively. According to our results, we concluded that the pregermination treatments we assayed improved the physiological potential for the germination of piquin pepper seeds.

scholarly journals Effect of Spraying Salicylic Acid and Potassium on Sweet Pepper Growth under Water Stress

2018 ◽  
Vol 26 (8) ◽  
pp. 41-52 ◽  
Author(s):  
Ibrahim Mordhi Radhi ◽  
Haider Talib
Keyword(s):  
Salicylic Acid ◽  
Water Stress ◽  
Vegetative Growth ◽  
Growing Season ◽  
Sweet Pepper ◽  
Potassium Content ◽  
Randomized Design ◽  
The Impact ◽  
Living Area ◽  
Private Farm

         This experiment was conducted during the spring growing season 2017 in private farm of Babylon to study the impact of spraying salicylic acid , potassium under water stress and their interaction in sweet pepper growth under water stress. Plants were sprayed three times in 20 days intervals with three levels of Salicylic acid(SA) (0 ,50 and 100 mg. L-1) , three levels potassium with ( 0, 1000 and 2000 mg. L-1) and three irrigation times (5 ,10 ,15 )days. Complete Randomized Design (C.R.D ) with three replicates. Means were compared by L.S.D.O.O5 . Plant high, leaves the number, living area, Auxin(IAA) and potassium content increased with the increase in SA, K concentrations, D1 and interaction between them. D3 significantly decreased vegetative growth and IAA, but increased proline, catalase, SOD and ABA. Also, most of the characters were significantly influenced by an interaction between D3, SA and K concentrations.

scholarly journals Effects of Hydro and Hormonal Seed Priming on Seed Germination of Milk Thistle under Saline Stress Condition

2014 ◽  
Vol 6 (3) ◽  
pp. 374-380
Author(s):  
Yousef NASIRI ◽  
Parisa FEYZI ◽  
Abdollah JAVANMARD
Keyword(s):  
Salicylic Acid ◽  
Germination Rate ◽  
Seed Priming ◽  
Germination Percentage ◽  
Milk Thistle ◽  
Saline Stress ◽  
Nacl Salinity ◽  
Germination Time ◽  
Randomized Design ◽  
Mean Germination Time

Salinity is an abiotic stress which has harmful effects on germination of many plants. Therefore, high germination rate and vigorous early growth under salty soils is preferred. Seed priming is a way to increase salt tolerance of plants. An experiment was conducted to investigate the effect of seed priming on germination of milk thistle under salinity condition. The treatments were 4 levels of seed priming (no priming, distilled water as hydro priming and 0.5 and 1.0 mM salicylic acid) and 5 levels of salinity (0, 40 and 80 mM NaCl and 40 and 80 mM CaCl2). The experiment arranged as a factorial in a completely randomized design (CRD) with three replications. Results showed that salinity decreased germination percentage and germination rate to about 16 and 32% in 80 mM CaCl2 level compared to control, respectively. The highest mean germination time (5.7 day) were belonged to 80 mM CaCl2. Radicle and plumule length significantly decreased by 80 mM NaCl and 40 and 80 mM CaCl2. The lowest seedling weight and seed stamina observed in 80 mM CaCl2. 0.5 mM salicylic acid improved all traits except mean germination time as compared to control.  Salicylic acid (0.5 mM) improved radicle length under 0, 40 and 80 mM NaCl salinity levels as well as increased plumule length at the 0 and 40 mM NaCl salinity conditions.

scholarly journals Germination and initial development of Simira gardneriana seedling under water stress and at different temperatures

2017 ◽  
Vol 21 (5) ◽  
pp. 333-338 ◽  
Author(s):  
Fabrícia N. de Oliveira ◽  
Jessica R. de Oliveira ◽  
Salvador B. Torres ◽  
Rômulo M. O. de Freitas ◽  
Narjara W. Nogueira
Keyword(s):  
Water Stress ◽  
Water Availability ◽  
Dry Weight ◽  
Germination Percentage ◽  
Initial Development ◽  
Randomized Design ◽  
Seedling Length ◽  
Germination Speed ◽  
Different Temperatures ◽  
Completely Randomized Design

ABSTRACT The germination of seeds is affected by many factors, including water availability and temperature. This study aimed to evaluate the effects of water stress and different temperatures on germination and initial development of S. gardneriana M. R. Barbosa & Peixoto seedlings. The experiment was carried out in a completely randomized design, in a 7 x 4 factorial scheme, with seven potentials (0; -0.1; -0.2; -0.3; -0.4; -0.5 and - 0.6 MPa) and four temperatures (25, 30, 35 and 20-30 °C), with four replicates of 25 seeds. The analyzed variables were germination, percentage of normal seedlings, germination speed index, seedling length (shoot and root) and dry weight (shoot and root). There is a decrease in the germination and vigor of the seeds as the water potential decreases, being less affected under the temperature of 25 °C and very accelerated at 35 °C. The tolerance of S. gardneriana seed germination to water stress is variable between the temperatures and limiting to the formation of normal seedlings from the potential -0.5 MPa at temperatures of 25 to 30 °C and -0.4 and -0.2 MPa for 20-30 and 35 °C, respectively.

scholarly journals Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000

2011 ◽  
Vol 68 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Carlos Henrique Salvino Gadelha Meneses ◽  
Riselane de Lucena Alcântara Bruno ◽  
Pedro Dantas Fernandes ◽  
Walter Esfrain Pereira ◽  
Leonardo Henrique Guedes de Morais Lima ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Viability ◽  
Accelerated Aging ◽  
Germination Percentage ◽  
Randomized Design ◽  
Physiological Quality ◽  
Differential Viability ◽  
Osmotic Potentials ◽  
Cotton Cultivar

The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the least sensitive to the tested osmotic potentials, both in terms of germination and of vigor. The 'BRS-201' cultivar was mostly affected by the viability and vigor tests under water deficit conditions. Differential viability and vigor between cultivars were observed under the water stress levels.

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