Physiological Quality in Leucaena leucocephala Seeds Conditioned with Potassium Nitrate Submitted to Saline and Water Stresses

2019 ◽  
pp. 1-9
Author(s):  
Jackson Araújo Silva ◽  
Iris Renata Freire Silva ◽  
Andréa Celina Ferreira Demartelaere ◽  
André Dantas De Medeiros ◽  
Marcio Dias Pereira
Keyword(s):  
Leucaena Leucocephala ◽  
Nitrate Solution ◽  
Dry Weight ◽  
Potassium Nitrate ◽  
Saline Stress ◽  
Water Restriction ◽  
Initial Development ◽  
Seedling Length ◽  
Physiological Quality ◽  
The Impact

Leucaena leucocephala is a species that occurs in semi-arid regions capable of developing physiological and biochemical strategies under adverse environmental situations, such as saline soils and water deficiency. Even so, there are still losses in germination and initial development of plants, mainly due to abiotic stress effects, making it necessary to implement alternatives which are able to diminish the impact on the seeds with the use of potassium nitrate. The objective of this work was to evaluate the physiological quality in L. leucocephala seeds conditioned in potassium nitrate solution and subjected to saline and water stresses. After scarification, the unconditioned leucine seeds were separated and identified, and the conditioners were immersed in the 1.0 Mmol/L solution of potassium nitrate for 24 hours. The treatments were NaCl: 0; 30; 60; 90; 120 and 150 Mmol/L and the water potential: 0, 0; -0.2; -0.4; -0.6, and -0.8 MPa. The seeds were distributed over two Germitest® sheets, moistened with distilled water 2.5 times the dry weight and incubated in a B.O.D. at 25°C for 10 days. Then, the germination speed index, seedling length and seedling mass were measured for the normal seedlings. Eleven treatments with four replicates of 50 seeds were used. The design was completely randomized, and the statistical analyzes were performed in SAS. The use of potassium nitrate (KNO3) contributed to maintaining the physiological quality of L. leucochephala seeds under conditions of saline stress and water restriction.

scholarly journals Physiological quality of Urochloa brizantha seeds submitted to priming with calcium salts

2019 ◽  
Vol 49 ◽  
Author(s):  
Elizena Cristina Gomes Ribeiro ◽  
Rodrigo de Góes Esperon Reis ◽  
Cesar Crispim Vilar ◽  
Flavia Carolina Moreira Vilar
Keyword(s):  
Calcium Sulfate ◽  
Seedling Emergence ◽  
Nitrate Solution ◽  
Calcium Nitrate ◽  
Dry Weight ◽  
Potassium Nitrate ◽  
Calcium Salts ◽  
Physiological Quality ◽  
Urochloa Brizantha

ABSTRACT Seed priming provides a variety of benefits, including seed invigoration and reduced dormancy. Urochloa brizantha seeds are typically primed with difficult-to-acquire potassium nitrate (KNO3). In this sense, calcium salts stand out as an alternative, but it is important to determine whether they provide the same benefits as potassium nitrate. This study aimed to evaluate the physiological quality of U. brizantha seeds after priming with calcium salts, and compare the results to those obtained with potassium nitrate. Seeds were submitted to priming with calcium nitrate [Ca(NO3)2] and calcium sulphate (CaSO4) at -0.55 MPa and -1.10 MPa, for 12 h and 24 h, and potassium nitrate (KNO3) at -1.10 MPa for 12 h, as well as to no priming (control). A completely randomized design, with ten treatments and four repetitions, was used. Priming promoted a higher germination percentage and lower seed dormancy, with a greater seedling emergence in a shorter time period. CaSO4 did not differ from KNO3 in shoot dry weight of seedlings, but reduced the electrical conductivity of seeds. Calcium nitrate and calcium sulfate show a promising potential for use in the osmotic priming of Urochloa brizantha (BRS Piatã cultivar) seeds, since they are as efficient as potassium nitrate, as well as less costly and easier to purchase. Calcium sulfate priming at -0.55 MPa for 12 h, at 25 ºC, is recommended to replace the potassium nitrate solution.

scholarly journals Physiological quality of osmoprimed gherkin seeds

2013 ◽  
Vol 35 (3) ◽  
pp. 368-373 ◽  
Author(s):  
Rodrigo de Góes Esperon Reis ◽  
Humberto Pereira da Silva ◽  
José Maria Gomes Neves ◽  
Renato Mendes Guimarães
Keyword(s):  
Electrical Conductivity ◽  
Room Temperature ◽  
Dry Weight ◽  
Potassium Nitrate ◽  
Germination Percentage ◽  
Initial Profile ◽  
Randomized Design ◽  
Physiological Quality ◽  
Osmotic Potentials

It was aimed to verify the effect of different methodologies of osmopriming on physiological quality of gherkin seeds. Prior, it has been characterized the initial profile of the gherkin seeds. Then, the seeds were osmoprimed in gerboxes containing two blotter papers wetted with osmotic solutions in a volume equal to three times the paper dry weight and kept in BOD at 15 °C. After the priming, the seeds were dried at room temperature for 48 hours. Then, the following variables were evaluated: seeds moisture content, percentage of germination, percentage of emergence, emergence speed index and electrical conductivity. The analyses of variances were realized according to a randomized design in a factorial scheme 3 x 2 x 4: three solutes (polyetilene glycol 6000 - PEG, potassium nitrate - KNO3 and PEG + KNO3), two osmotic potentials (-0.55 and -1.10 MPa) and four times of priming (24, 48, 72 and 96 hours), followed by analyses of regression. It is concluded that the priming has no effect on germination and affects positively the vigor of the gherkin seeds lots; osmopriming with potassium nitrate is effective in improving the physiological quality of gherkin seeds lot.

scholarly journals Biochemical and physiological changes of Tabebuia roseoalba (Ridl.) Sandwith (Bignoniaceae) seeds under storage

2014 ◽  
Vol 36 (1) ◽  
pp. 100-107 ◽  
Author(s):  
Leticia Caravita Abbade ◽  
Massanori Takaki
Keyword(s):  
Seed Quality ◽  
Deciduous Forest ◽  
Dry Weight ◽  
Forest Species ◽  
Polyphenol Oxidase Activity ◽  
Weight Content ◽  
Seedling Length ◽  
Physiological Quality ◽  
Activity Loss ◽  
Forest Seeds

Tabebuia roseoalba (Ridl.) Sandwith is a Brazilian forest species, with great use in landscaping and reforestation, occurring mainly in the semi-deciduous forest. Seeds are small, lightweight, winged and wind-dispersed. The objective of this study was to verify the physiological quality and biochemical changes in T. roseoalba seeds during 24-month storage. The following were assessed: germination, emergence, seedling length and seedling dry weight, content of lipids, proteins and phenolic compounds, and enzyme activity. Loss of seed quality during storage was evidenced by reduced germination and emergence, shorter seedling length and lower seedling dry weight, decreased content of lipids and proteins, decreased peroxidase and catalase activity, and increased phenolic compound content and polyphenol oxidase activity. Seeds should be stored and used within six months after collection.

scholarly journals ​The Effect of Rhizobacteria in the Reducing drought Stress in Soybean (Glycine max L.)

2021 ◽  
Author(s):  
E. Oral ◽  
R. Tunçtürk ◽  
M. Tunçtürk
Keyword(s):  
Glycine Max ◽  
Green Algae ◽  
Dry Weight ◽  
Water Restriction ◽  
Blue Green Algae ◽  
Physiological Properties ◽  
Seedling Length ◽  
Glycine Max L ◽  
Wet Weight ◽  
Irrigation Levels

Background: This study was carried out to determine the effects of rhizobacteria and blue green algae applications on some physiological properties of soybean (Glycina max L.) grown under water stress. Methods: The experiment was conducted in factorial order with 4 replications according to the randomized plot trial design. In the research, Arýsoy variety belonging to soybean (Glycine max L.) species was used. In the experiment, it was aimed to examine the effects of three different irrigation levels (100, 50 and 25%) on some physiological characteristics of soybean with a control (control (B0), two different bacteria used. In this study, strains R1 of Azospirillum lipoferum bacteria, strains numbered 98 belonging to Bacillus megaterium bacteriaein and one blue green algae (Chlorella saccharophilia) were used. Result: According to the average data obtained, root length is 24.75 cm- 30.85 cm, seedling length 28.10-36.57 cm, root fresh weight 1.10-1.43 g, seedling wet weight 1.55-2.41 g, root dry weight 0.15-0.18 g, seedling dry weight 0.38-0.46 g, azote balance index 70.64-82.90 (dualex value), flavonol 0.375-0.398 (dualex value) and anthocyanin 0.016-0.045 (dualex value), with water restriction showed a decrease in most of these values. It has been determined that the rhizobacteria and blue-green algae have a decreasing and regulating effect on the physiological properties examined.

scholarly journals Effect of the storage of soybean seeds treated with agrochemicals on the physiological quality and on the seedlings morphology

2020 ◽  
Vol 6 ◽  
pp. 1-8
Author(s):  
João Pedro Garcia Nogueira ◽  
Danúbia Aparecida Costa Nobre ◽  
Guilherme Ferreira Alves ◽  
Éder Matsuo ◽  
Willian Rodrigues Macedo
Keyword(s):  
Seed Treatment ◽  
Storage Time ◽  
Soybean Seeds ◽  
Initial Development ◽  
Soybean Seedlings ◽  
Anthranilic Diamide ◽  
Seedling Length ◽  
Physiological Quality ◽  
The One

Seed treatment is the most efficient technique for controlling pests and pathogens that can influence the initial development of the crop. However, storing treated seeds may damage the physiological quality. Thus, the objective of this study was to evaluate the influence of storage on the physiological quality of treated soybean seeds and on the morphology of soybean seedlings. The treatments were carried out with Fludioxonil, Imidacloprid and Anthranilic Diamide, in the dosage of 200, 150 and 100 mL of the commercial product 100 kg of seeds, respectively, from the cultivar BRSMG752S. The experimental designs used were randomized blocks (greenhouse) and completely randomized (laboratory), in a simple factorial 4x4scheme, with 4 sowing times (30, 20, 10 and 0 days after treatments) and 4 treatments (3 products and untreated seeds) with 4 repetitions. The treatment of soybean seeds with Anthranilic Diamide submitted to different storage periods was the one with the closest physiological quality to the treatment without application of agrochemicals. The soybean seeds treated with Imidacloprid showed a reduction in physiological quality with the storage time, reduction (in general) in the root length and presented a lower seedling length at 20 days of storage.

scholarly journals Growth of Leucaena leucocephala (Lam.) de Wit favored by organic waste in the Brazilian semiarid region

2016 ◽  
Vol 20 (7) ◽  
pp. 612-617 ◽  
Author(s):  
Francisco H. C. Amaral ◽  
Júlio C. A. Nóbrega ◽  
Rafaela S. A. Nóbrega ◽  
José F. Lustosa Filho ◽  
Sarah P. do N. Amorim
Keyword(s):  
Leucaena Leucocephala ◽  
Organic Waste ◽  
Weight Ratio ◽  
Dry Weight ◽  
Development Stage ◽  
Stem Diameter ◽  
Semiarid Region ◽  
Initial Development ◽  
Root Dry Weight ◽  
Shoot Dry Weight

ABSTRACT The aim of this study was to evaluate the effect of sources and rates of organic waste and their interaction on the growth of Leucaena leucocephala (Lam.) de Wit, in the Southeast region of Piauí State. The treatments consisted of two sources (Copernicia prunifera (Mill.) H.E. palm residue and plant compound) and six organic waste rates. The study was conducted in the period of March-June 2011 and the following parameters were evaluated: stem diameter, height, number of leaves, shoot dry weight, root dry weight, total dry matter, root volume, shoot dry weight/root dry weight ratio, height/stem diameter ratio and the Dickson Quality Index. The Copernicia prunifera (Mill.) H.E. palm residue and plant compound showed a great potential to be used in the manufacture of substrates for the production of seedlings Leucaena leucocephala (Lam.) de Wit, since their initial development was influenced by the sources and proportions of these organic residues and by the interaction between these treatments. The substrate containing 50% of plant compound produced better quality of plants of Leucaena leucocephala (Lam.) de Wit in their initial development stage.

scholarly journals PRODUTIVIDADE E QUALIDADE FISIOLÓGICA DE SEMENTES DE CULTIVARES DE TRIGO EM DIFERENTES DENSIDADES DE SEMEADURA

2018 ◽  
Vol 14 (3) ◽  
pp. 122-131
Author(s):  
Jéssica de Lucena Marinho ◽  
José Henrique Bizzarri Bazzo ◽  
Carolina Pereira Cardoso ◽  
Claudemir Zucareli ◽  
Inês Cristina de Batista Fonseca
Keyword(s):  
Agricultural Research ◽  
Seedling Emergence ◽  
Accelerated Aging ◽  
Dry Weight ◽  
Seed Vigor ◽  
Seeding Density ◽  
Seed Productivity ◽  
Seedling Length ◽  
Physiological Quality

Determination of optimum wheat sowing density, adequate to the genotype and the environment, is essential to avoid lodging and competition between plants, which can reduce seed productivity and quality. In this sense, the objective of this study was to evaluate the effect of seeding density (in cultivars BRS Sabiá e BRS Gralha-Azul) on productivity and physiological quality of seeds of two wheat cultivars. The seeds were produced in the experimental field of the Brazilian Agricultural Research Corporation, in Londrina-PR, at the National Center for Soy Research (Embrapa Soja) in experimental design of randomized blocks in a 2x4 factorial scheme, with four replications. The following evaluations were performed: seed productivity, thousand seeds mass, first count of germination, germination, seedling length, seedling dry weight, accelerated aging, seedling emergence in sand and emergency speed index. In general, the increase in seed density increases seed production and does not alter germination and emergence of seedlings of both cultivars. The cultivar BRS Gralha-Azul proved to be more productive than BRS Sabiá. The increase in seeding density increases seed vigor for BRS Sabiá cultivar and reduces to BRS Gralha-Azul cultivar.

scholarly journals Phytotoxicity in soybean seeds treated with phytosanitary products at different application times

2020 ◽  
Vol 42 ◽  
Author(s):  
Everson Reis Carvalho ◽  
Debora Kelli Rocha ◽  
Dayliane Bernardes de Andrade ◽  
Raquel Maria de Oliveira Pires ◽  
Amanda Carvalho Penido ◽  
...  
Keyword(s):  
Seed Treatment ◽  
Seed Quality ◽  
Soybean Seed ◽  
Field Performance ◽  
Soybean Seeds ◽  
Water Restriction ◽  
Hypocotyl Length ◽  
Initial Development ◽  
Physiological Quality ◽  
Phytosanitary Products

Abstract: Due to increased use of treated seeds, studies are necessary in relation to the effects of the treatments and their possible consequences on seed quality. The aim of this study was to evaluate phytotoxicity according to when phytosanitary products are applied on soybean seeds and their effect on seed physiological quality and field performance. A completely randomized experimental design was used in a 9 × 2 factorial arrangement involving 9 seed treatments (fungicides and insecticides) and two application times (60 days before sowing and at the time of sowing in the field). Moisture content was determined and tests were performed to ascertain physiological quality (germination and germination under water restriction). Root and hypocotyl length, seedling length, and vigor and uniformity indices were evaluated with the assistance of Vigor-S®. In the field, the following determinations were made: plant height at 30 and 60 days after emergence, first pod height, number of pods per plant, number of seeds per pod, and yield. Early seed treatment in the soybean crop can affect initial development of the plants, but it does not affect yield. The phytotoxicity caused by the soybean seed treatment was observed in the root length characteristic.

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 Influence of seed size and water restriction on germination of soybean seeds and on early development of seedlings

2013 ◽  
Vol 35 (3) ◽  
pp. 316-322 ◽  
Author(s):  
Welison Andrade Pereira ◽  
Sara Maria Andrade Pereira ◽  
Denise Cunha Fernandes dos Santos Dias
Keyword(s):  
Water Stress ◽  
Water Potential ◽  
Seed Size ◽  
Biological Process ◽  
Dry Weight ◽  
Soybean Seeds ◽  
Water Restriction ◽  
Soybean Seedling ◽  
Physiological Quality ◽  
Moisture Conditions

Germination is a biological process that depends on adequate water supply to embryo development. Water deficit slows this process and depending on intensity and extent of this deficit may cause seed death. Nevertheless, it has not yet been reported whether seed size influences physiological potential, or tolerance to water stress. This study aimed at assessing the effects of seed size, as well as of water stress on germination of the seeds and on early soybean seedling development. The experiment was composed by seeds of 10 soybean cultivars classified by metallic screens with three sizes of oval holes (S12, S13 and S14) and subjected to three water potentials (0, -0.1, and -0.2 MPa), with four replications. Data on genotypes were grouped as replications and arranged on a factorial 3 x 3 (size x water potential), with 40 replications. Data assessed were: first and final count of germination; length and seedling dry weight; and correlation between length/mass of radicle and hypocotyl. It was concluded that under ideal moisture conditions larger seeds have better physiological quality, producing more vigorous seedlings; but, that under water potential of -0.2 MPa smaller seeds produce larger seedlings; and that the hypocotyl is more influenced by water stress than the radicle.

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