scholarly journals Methods for priming maize seeds

2016 ◽  
Vol 38 (2) ◽  
pp. 148-154 ◽  
Author(s):  
Dryelle Sifuentes Pallaoro ◽  
Elisangela Clarete Camili ◽  
Sebastião Carneiro Guimarães ◽  
Maria Cristina de Figueiredo e Albuquerque
Keyword(s):  
Polyethylene Glycol ◽  
Cold Test ◽  
Dry Mass ◽  
Maize Seeds ◽  
Water Potentials ◽  
Randomized Design ◽  
Vigor Index ◽  
Completely Randomized Design ◽  
Polyethylene Glycol 6000

Abstract: This study aimed to evaluated different methodologies and water potentials for priming of maize seeds, in order to increase vigor. The experiment was carried out following a completely randomized design, in a factorial scheme 4x3+1, with four water potentials (0.0, -0.4, -0.8 and -1.2 MPa), three priming methods (immersion in non-aerated solution, immersion in aerated solution, paper roll) and a control. After priming, the seeds were dried and evaluated for water content, percentage and first germination count, seedlings length and dry mass, cold test and vigor index. The water potential recommended for priming maize seeds, in polyethylene glycol 6000 is -0.4 MPa for 24 hours. The priming procedures in towel paper rolls improve the quality of maize seeds.

scholarly journals Physiological quality of seed and seedling performance of crambe genotypes under water stress

2017 ◽  
Vol 21 (3) ◽  
pp. 175-179 ◽  
Author(s):  
Fernando H. B. Machado ◽  
Andréia M. S. de S. David ◽  
Lucas V. S. Cangussú ◽  
Josiane C. Figueiredo ◽  
Hugo T. R. Amaro
Keyword(s):  
Polyethylene Glycol ◽  
Water Stress ◽  
Randomized Design ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
And Performance ◽  
Osmotic Agents ◽  
Polyethylene Glycol 6000 ◽  
Osmotic Potentials

ABSTRACT Water stress is a condition that causes physiological changes in different species and even genotypes of the same species. One of the osmotic agents most used to simulate this condition is polyethylene glycol 6000. The aim of this study was to evaluate the effects of water stress on the physiological quality of seeds and performance of seedlings of crambe genotypes. A completely randomized design was used, in a factorial scheme with two genotypes (one cultivar and one line) and five osmotic potentials simulated with aqueous solutions of polyethylene glycol 6000 (control = 0, -0.25, -0.50, -1.0, -1.50 MPa), with four replicates of 50 seeds per treatment. The effects of the treatments were evaluated by means of germination, first count, germination speed index and fresh and dry matter of seedlings. The physiological quality of seeds and the performance of crambe seedlings are negatively affected under water stress from -0.25 MPa on. Seeds of the genotype FMSCR 1101 have greater tolerance to drought stress, regardless of the osmotic potential used.

scholarly journals Silicon Potential as Attenuator of Salinity Effects on Growth and Post-harvest Quality of Lettuce

2018 ◽  
Vol 10 (7) ◽  
pp. 455
Author(s):  
Hozano De Souza Lemos Neto ◽  
Marcelo De Almeida Guimarães ◽  
Rosilene Oliveira Mesquita ◽  
Italo Marlone Gomes Sampaio ◽  
Ana Régia Alves de Araújo Hendges ◽  
...  
Keyword(s):  
Plant Growth ◽  
Titratable Acidity ◽  
Dry Mass ◽  
Soluble Solids ◽  
Saline Stress ◽  
Post Harvest ◽  
Randomized Design ◽  
Salinity Levels ◽  
Completely Randomized Design

Silicon (Si) is a mineral element that provides many benefits to plants and may also assist in tolerance to abiotic stresses such as salinity. The aim of the study was to evaluate the use of Si as a possible attenuator of the deleterious effects of salinity on growth and post-harvest of lettuce. A completely randomized design with four replicates was performed in a 3 × 2 factorial, consisting of three salinity levels (1.65, 3.65, 7.65 dS m-1) and two levels of silicon (0.0 and 2.0 mM). Salinity reduced all variables related to plant growth. For shoot fresh and dry mass, it was observed that NaCl caused a reduction of 79.80 and 80%, respectively, in comparison to the control. However, parameters related to post-harvest such as titratable acidity, soluble solids and vitamin C increased with salinity. Although not effective in reducing saline stress on plant growth, Si provided improvements in the variables related to lettuce post-harvest. Salinity significantly reduced plant growth in the presence and absence of Si, but provided better post-harvest quality with Si.

scholarly journals PHYSIOLOGICAL QUALITY OF Brachiaria brizantha SEEDS TREATED WITH FUNGICIDE AND INSECTICIDE

2018 ◽  
Vol 31 (3) ◽  
pp. 651-656
Author(s):  
ERIC FABIANO SERAGUZI ◽  
CARLOS HENRIQUE QUEIROZ REGO ◽  
FERNANDA BRITO CARDOSO ◽  
ANA CARINA DA SILVA CÂNDIDO ◽  
CHARLINE ZARATIN ALVES
Keyword(s):  
Root Development ◽  
Dry Mass ◽  
Brachiaria Brizantha ◽  
Thiophanate Methyl ◽  
Physiological Characterization ◽  
Randomized Design ◽  
Phytotoxic Effect ◽  
Physiological Quality ◽  
Completely Randomized Design

ABSTRACT This study aimed to evaluate the effects of chemical treatment of seeds with fungicide and insecticide on the seed physiological quality of Brachiaria brizantha cultivar MG5. Two experiments with four replicates were carried out in a completely randomized design. In the first experiment, the seeds were treated with the fungicide pyraclostrobin + fipronil + thiophanate-methyl and in the second, with the insecticide thiamethoxam, both at doses of 0, 150, 300, 450, and 600 mL of commercial product (CP)/100 kg of seeds. Physiological characterization was done on the basis of the first germination count, germination (%), emergence (%), emergence speed index, and length and dry mass of shoot and root. The treatment of B. brizantha seeds with the fungicide pyraclostrobin + fipronil + thiophanate-methyl benefits the physiological quality of seeds, improving germination and root development, with no phytotoxic effect up to the dose of 600 mL of CP/100 kg of seeds. The insecticide thiamethoxam has a biostimulating effect on B. brizantha cultivar MG5 up to the dose of 270 mL of CP/100 kg of seeds, but is phytotoxic in larger doses.

scholarly journals Antioxidant activity and physiological performance of popcorn seed after saline stress and analysis of seedling images

2020 ◽  
Vol 44 ◽  
Author(s):  
Hugo Cesar Rodrigues Moreira Catão ◽  
Franciele Caixeta ◽  
Amanda Moreira Lopes ◽  
Flavia Andrea Nery-Silva ◽  
Adílio de Sá Júnior
Keyword(s):  
Antioxidant Activity ◽  
Salt Stress ◽  
Dry Mass ◽  
Saline Stress ◽  
Physiological Performance ◽  
Randomized Design ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
The Relationship

ABSTRACT Salinity influences all germination stages and may adversely affect seedling establishment in the field. The objective of this research was to determine the relationship between the antioxidant activity and the physiological performance of seeds and to verify the efficacy of the imaging analysis of popcorn seedlings after seed exposure to saline stress. A completely randomized design was used that consisted of four replicates in a factorial scheme. This scheme comprised three popcorn hybrids (P618, AP6002, and AP8203) and five saline potential levels (0.0; -0.1; -0.3; -0.6, and -0.9 MPa) that were obtained from KCl solutions of different concentrations. First count germination, germination and seedling vigor classification (strong normal seedlings), and dry mass of seedlings were evaluated to determine the physiological quality of the seed. The images of seedlings were used to evaluate the coleoptile and root lengths, indices of vigor, uniformity, and growth using the Groundeye® software. The activities of the antioxidant enzymes superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) were also determined. Saline stress compromises the physiological quality and antioxidant activity of seeds and the performance of popcorn seedlings. Computerized image analysis using Groundeye® was efficient in evaluating the popcorn seedlings after being subjected to salt stress. Hybrids AP6002 and AP8203 were more tolerant to salt stress than hybrid P618.

scholarly journals Initial Growth of Amburana cearensis in Decomposed Buriti Stem Substrate and Nitrogen Doses

2018 ◽  
Vol 10 (7) ◽  
pp. 497
Author(s):  
Augusto Matias de Oliveira ◽  
Wéverson Lima Fonseca ◽  
Tiago De Oliveira Sousa ◽  
Hingrid Raiany Santos Teixeira ◽  
Fernandes Antonio de Almeida ◽  
...  
Keyword(s):  
Native Species ◽  
Significant Interaction ◽  
Aerial Part ◽  
Slow Growth ◽  
Dry Mass ◽  
Initial Growth ◽  
Initial Development ◽  
Randomized Design ◽  
Completely Randomized Design

One of the difficulties of producing native species seedlings is slow growth. The objective of this study was to evaluate the initial development of Amburana cearensis (Allem.) A. C. Smith in relation to the concentration decomposed buriti stem substratum and nitrogen doses. A completely randomized design was used in a factorial arrangement of 3 × 5 (proportions of decomposed buriti stem × nitrogen doses), with six replicates. The treatments were formulated substrates comprised of decomposed buriti stem manually mixed with soil (Dystrophic Yellow Latosol) in three proportions (0, 25 and 50%) and five nitrogen doses (0, 100, 200, 300 and 400 mg dm-3) applied in treatments. There was no significant interaction between the DRM and ND factors. However, there was an isolated effect for the following variables: Plant height (PH), stem diameter (SD), leaf number (LN), leaf area (LA), dry mass of the aerial part (DMA) and root length (RL). The best concentrations of the substrate for the variables PH, LA and DMA were 25% and 50%, whereas for SD, LN and RL, the best result was 50%. ND and other variables had good responses under recommended doses ranging from a minimum of 264.82 mg dm-3, observed in DMA, and a maximum of 400 mg dm-3, observed in RL. Both factors positively the quality of umburana seedlings.

scholarly journals Physiological, isozyme changes and image analysis of popcorn seeds submitted to low temperatures

2017 ◽  
Vol 39 (3) ◽  
pp. 234-243 ◽  
Author(s):  
Hugo César Rodrigues Moreira Catão ◽  
Franciele Caixeta
Keyword(s):  
Low Temperatures ◽  
Seed Quality ◽  
Dry Mass ◽  
Enzyme Expression ◽  
Randomized Design ◽  
Radicle Protrusion ◽  
Negative Effect ◽  
Physiological Quality ◽  
Completely Randomized Design

Abstract: This present study aimed to assess seed quality of popcorn seedlings subjected to low temperatures by examining their physiological changes, enzymes, and images. We used a completely randomized design with four replications in a factorial arrangement with four hybrids (P618, AP6002, AP8202, AP8203) and five temperatures (10, 13, 16, 19 and 25 °C). Their physiological quality was assessed through radicle protrusion, germination, dry mass of seedlings and emergence. We have assessed the images of seedlings through their hypocotyl and root lengths; and through rates of automatic force, uniformity and growth, provided by Groundeye. The isozyme expressions were determined for the catalase (CAT - IUBMB: EC 1.11.1.6), alcohol dehydrogenase (ADH - IUBMB: EC 1.1.1.1), malate dehydrogenase (MDH - IUBMB: EC: 1.1.1.37) and α-amylase (α-AMY - IUBMB: EC 3.2.1.1). Results show that low temperatures cause a negative effect on seed physiological quality in enzyme expression of CAT, ADH, MDH and α-AMY and on the performance of seedlings. These alterations compromise seed quality. Hybrids AP6002 and AP8203 should be recommended for sowing at up to 16 °C. The Groundeye software was efficient in the analysis of popcorn seedlings and in for the assessment of seed quality when submitted to low temperatures.

scholarly journals Growth and quality of SJ-02 cocoa seedlings (Theobroma cacao L.) under different irrigation depths and cultivation containers

2020 ◽  
pp. 1695-1700
Author(s):  
Vinicius de Souza Oliveira ◽  
Stefany Sampaio Silveira ◽  
Robson Prucoli Posse ◽  
Laís Gertrudes Fontana Silva ◽  
Valeria Pancieri Sallin ◽  
...  
Keyword(s):  
Theobroma Cacao ◽  
Quality Index ◽  
Dry Mass ◽  
Seedling Production ◽  
Randomized Design ◽  
Irrigation Depth ◽  
Completely Randomized Design ◽  
Theobroma Cacao L ◽  
Cocoa Seedlings

The study aimed to evaluate the growth and quality of SJ-02 cocoa seedlings under different irrigation depths and cultivation container sizes. The experiment was arranged as a completely randomized design, in a factorial scheme (4x3), where the first factor consisted of the application of four different irrigation depths (6, 10, 12 and 14 mm d-1) and the second one was composed of three different cultivation containers (small, medium and large). Twelve treatments were evaluated with eight repetitions, totaling 96 plants in the experimental field. At 74 days after sowing, the leaf area, stem diameter, plant height, dry mass of the aerial part, dry mass of the root system, total dry mass and Dickson's quality index of all seedlings were analyzed. The 10.32 mm d-1 irrigation depth and the medium and large cultivation containers provided the highest quality in seedling production, being the most suitable ones. However, there was no interaction between the factors

scholarly journals QUALITY OF CORN SEEDS STORED IN DIFFERENT TYPES OF PACKAGING AND STRESS CONDITIONS

2020 ◽  
Vol 28 ◽  
pp. 185-191
Author(s):  
André Fernandes Capilheira ◽  
Joseano Graciliano da Silva ◽  
Jerffeson Araujo Cavalcante ◽  
Nander Ferraz Hornke ◽  
Gizele Ingrid Gadotti
Keyword(s):  
Water Content ◽  
Storage Temperature ◽  
Cold Test ◽  
Randomized Design ◽  
Different Types ◽  
Agricultural Potential ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
Sowing Period

Corn (Zea mays) is one of the most cultivated poaceae in the world with high agricultural potential. It is propagated through seeds, which sometimes remain stored until the sowing period. Among the various forms of storage, some aspects related to the environment and the type of material that constitutes the packaging may compromise the viability and vigor of these seeds. Therefore, the objective of this study was to evaluate the physiological quality of corn seeds stored in different types of packaging and subjected to conditions of high temperature and relative humidity throughout storage. For this purpose, water content, germination and vigor were evaluated through the cold test. A completely randomized design in a 4 x 4 factorial scheme (packaging x evaluation times) with four replications was used. Data were subjected to analysis of variance and regression, and the means were compared by Tukey test at 5% probability, using the Sisvar 5.3 statistical software. It was concluded that, in 45 days of storage, the water content in corn seeds reached values of up to 13.62%, which resulted in a reduction in the vigor due to high respiration caused by the storage temperature.

scholarly journals Physiological potential of corn seeds treated with different dosages of molybdenum and potassium

2021 ◽  
pp. 411-418
Author(s):  
Gisely Paula Gomes ◽  
◽  
Robison Alesandro de Queiroz ◽  
Lúcia Sadayo Assari Takahashi ◽  
◽  
...  
Keyword(s):  
Crop Production ◽  
Dry Matter ◽  
Animal Feed ◽  
Cold Test ◽  
Dry Mass ◽  
Productive Capacity ◽  
Maize Seeds ◽  
Seedling Length ◽  
Physiological Quality

Corn is important in agriculture for its dual is uses as food and animal feed. The use of quality seeds is fundamental for outcomes in the field. The treatment of seeds with molybdenum may increase the productive capacity and uniformity of the corn. For this to work, the amount applied to the seeds must be adequate to promote development and increase the final crop production. Thus, the objective of this work was to verify the effects of molybdenum and potassium application on the germination and vigor of corn seeds. The physiological quality of the seeds was evaluated by germination, first count, seedling length (shoot and root), seedling dry matter mass, emergence, and the cold test. Six treatments (T1–T6) were performed, with T1 free of molybdenum and potassium and the others with varying dosages. The seeds were treated with a commercial product that containing molybdenum and potassium. The design was completely randomized, with four replications and six treatments. Smaller doses of molybdenum resulted in a higher percentage of normal seedlings. Based on the length and dry mass of the seedlings, it was verified that maize seeds were negatively impacted by increasing doses of molybdenum and potassium. In the emergence tests in sand, treatments T5 and T6 presented a greater number of seedlings. The physiological quality of corn seeds was not significantly influenced by the application of molybdenum and potassium in the first count and germination results in the cold and germination tests.

scholarly journals Physiological maturation of cowpea seeds

2014 ◽  
Vol 36 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Narjara Walessa Nogueira ◽  
Rômulo Magno Oliveira de Freitas ◽  
Salvador Barros Torres ◽  
Caio César Pereira Leal
Keyword(s):  
Dry Mass ◽  
Germination Percentage ◽  
Maturation Process ◽  
Cowpea Seeds ◽  
Randomized Design ◽  
Germination Process ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
Nutrient Reserves

The seed maturation process is genetically controlled and involves an arranged sequence of morphological and physiological changes extending from fertilization to its total independence from the mother-plant. These changes also include a set of preparatory phases for the germination process, which are characterized for the synthesis and accumulation of nutrient reserves. Thereby, this study was developed aiming at assessing development and physiological quality of cowpea seeds during maturation process. To this, the cowpea pods of cultivar BRS-Guariba were harvested from the tenth day after anthesis (DAA) until the twenty sixth DAA, with four days intervals. Immediately after each harvest, seeds were manually extracted from the pods and then subjected to the following determinations: moisture content, first count of germination, final germination percentage, length of shoots and roots, hypocotyl diameter, and seedling dry mass. The experiment was conducted in a completely randomized design, with five treatments (DAA), and four replications to each treatment. Results have shown that cowpea seeds have fairly fast physiological maturation, and that seeds harvested between 14 and 18 DAA have better vigor as well as higher germination rates; thus the harvest performed during this period does not cause damages to seeds.

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