scholarly journals Reduction in the period for evaluation of the physiological quality of newly harvested black oat seeds

2015 ◽  
Vol 37 (4) ◽  
pp. 244-248
Author(s):  
Camila Ribeiro de Souza Grzybowski ◽  
Renato Farinacio ◽  
Maristela Panobianco
Keyword(s):  
Moisture Content ◽  
Limiting Factor ◽  
Germination Test ◽  
Breaking Dormancy ◽  
Oat Seeds ◽  
Physiological Quality ◽  
Sowing Season ◽  
Tetrazolium Test

Abstract: Black oat seeds exhibit dormancy when newly harvested, which is normally broken in the interval between harvest and the sowing season. Dormancy, however, becomes a limiting factor in the estimate of the physiological quality of the seeds soon after harvest, requiring the use of methods for breaking dormancy, which delays making decisions in regard to the destination of seed lots. Given this situation, the aim of the present study was to evaluate the possibility of reducing the period for obtaining results in the germination test of newly harvested black oat seeds, studying variations on the recommended methods for breaking dormancy. Five seed lots of newly harvested seeds of cultivar IAPAR 61 (Ibiporã) were used, for which the following determinations were done: moisture content, germination test, and tetrazolium test. The following methods were tested for breaking dormancy: pre-cooling at 5 - 10 ºC for three and five days; and pre-drying at 33 ºC for five and seven days. Based on the results obtained, it was concluded that there is the possibility of reducing the period recommended for estimating the germination of newly harvested black oat seeds through the use of pre-drying of the seeds for five days or of pre-cooling for three days.

scholarly journals Viability of Carica papaya L. Seeds by the Tetrazolium Test

2018 ◽  
Vol 10 (2) ◽  
pp. 335 ◽  
Author(s):  
Sara M. C. Carvalho ◽  
Salvador B. Torres ◽  
Erivanessa C. Sousa ◽  
Danielle M. M. Sousa ◽  
Kleane T. O. Pereira ◽  
...  
Keyword(s):  
Decision Making ◽  
Carica Papaya ◽  
Seed Viability ◽  
Germination Test ◽  
Long Period ◽  
Physiological Quality ◽  
Rapid Tests ◽  
Papaya Seeds ◽  
Tetrazolium Test

Germination test for papaya seeds demands thirty days to obtain the results, which is a long period for decision-making. Thus, rapid tests become essential tools to evaluate seed viability, and the tetrazolium test is an alternative for this purpose. Hence, this study aimed to establish the adequate procedure to apply this test, in order to reduce the time of evaluation of papaya seeds. For that, four tetrazolium solution concentrations (0.05, 0.1, 0.5 and 1%) and three staining times (3, 6 and 9 hours) were tested at temperatures of 35 and 40 ºC. The experimental design was completely randomized in 4 × 3 + 1 factorial scheme (concentrations × staining times + one control = germination test). It was found that the tetrazolium test allows to evaluate the physiological quality of papaya seeds, thus reducing the time for decision-making. For the test, we recommend using the concentrations of 0.1% for 9 hours or 1% for 6 hours of staining, at temperature of 40 ºC.

scholarly journals Qualidade Física e Fisiológica de Sementes Comercializadas de Capim-Colonião em Campo Grande - MS

2020 ◽  
Vol 24 (1) ◽  
pp. 07-11
Author(s):  
Silvia Rahe Pereira ◽  
Adriana Paula D’Agostini Contreiras-Rodrigues ◽  
Daiane Rodrigues Oliveira ◽  
Valdemir Antônio Laura ◽  
Daniela Aparecida Dalla-Costa
Keyword(s):  
Cultural Value ◽  
Germination Test ◽  
Tropical Regions ◽  
Genetic Potential ◽  
Randomized Design ◽  
Physiological Quality ◽  
Completely Randomized Design ◽  
Maximum Expression ◽  
Tetrazolium Test

O Centro-Oeste brasileiro representa a região brasileira com maior área e produção de sementes de Megathyrsus maximus, uma gramínea muito utilizada para a formação de pastagens em regiões tropicais do Brasil e outros países da América. Objetivou-se no presente estudo diagnosticar a qualidade física e fisiológica de sementes de três cultivares da espécie M. maximus (Mombaça, BRS Tamani e BRS Zuri) comercializadas por diferentes empresas de Campo Grande (MS). Os experimentos foram conduzidos utilizando-se sementes da safra 2017-2018 em um delineamento inteiramente casualizado, em esquema fatorial 3 x 6, avaliando-se três cultivares e seis procedências. As variáveis analisadas foram: pureza física, peso de mil sementes, primeira contagem do teste de germinação, germinação, valor cultural e teste de tetrazólio. Os resultados encontrados demonstram que, com exceção de um lote da cultivar Mombaça, os demais lotes das três cultivares da espécie Megathyrsus maximus (Mombaça, BRS Tamani e BRS Zuri), de todas as procedências avaliadas, apresentaram qualidade física e fisiológica compatível com a comercialização em função da legislação vigente. No entanto, é possível encontrar lotes com qualidade distinta no mercado de Campo Grande. Assim, a escolha adequada da procedência (empresa) vai garantir a expressão máxima do potencial genético, subsidiada por processos adequados de produção e pós-colheita. Palavras-chave: Megathyrsus Mombaça. Gramíneas Tropicais. Teste de Germinação. Teste de Tetrazólio. Valor Cultural.   Abstract Brazilian's Midwest represents the region with the largest area and production of Megathyrsus maximus seeds, a grass widely used for the pastures formation in tropical regions of Brazil and other countries in America.The objective of this study was to diagnose the physical and physiological quality of seeds of three cultivars of the species Megathyrsus maximus (Mombaça, BRS Tamani and BRS Zuri) commercialized by different companies of Campo Grande (MS). The experiments were conducted using seeds of the 2017-2018 harvest, in a completely randomized design, using a factorial scheme 3 x 6, with three species and six sources, totaling 18 treatments. The variables analyzed were: physical purity, weight of one thousand seeds, first count of germination test, germination, cultural value and tetrazolium. The results showed that with the exception of one lot of cultivar Mombaça, the other lots of the three cultivars of species Megathyrsus maximus (Mombasa, BRS Tamani and BRS Zuri), of all provenances, have compatible physical and physiological quality with marketing in accordance with current legislation. However, it is possible to find lots of different quality in the Campo Grande market. Thus, the appropriate choice of source (company) will guarantee the maximum expression of genetic potential, subsidized by adequate production and post-harvest processes. Keywords: Megathyrsus mombaça. Tropical Grasses. Germination Test. Tetrazolium Test. Cultural Value.

scholarly journals Test of exudates color hues for evaluating the physiological potential of coffee (Coffea arabica L.) seeds

2012 ◽  
Vol 34 (2) ◽  
pp. 212-217 ◽  
Author(s):  
Paulo Cesar Hilst ◽  
Denise Cunha Fernandes dos Santos Dias ◽  
Eveline Mantovani Alvarenga ◽  
Bruna Luiza de Souza
Keyword(s):  
Moisture Content ◽  
Accelerated Aging ◽  
Germination Test ◽  
Physiological Quality ◽  
Dark Color ◽  
Different Color ◽  
Light Color ◽  
Paper Towels ◽  
Coffea Arabica L

Coffee seeds have slow and irregular germination, losing fast their viability during storage, and the standard germination test of these seeds requires at least 30 days. Besides, the results may not reflect the actual physiological quality of these seeds. The objective of this work was to develop a fast and practical test for evaluating the viability of coffee seeds, which is based on the interpretation of different color hues of exudates from seeds. Coffee seeds of the cultivar Catuai 44 from six lots were submitted to germination, accelerated aging, and electrical conductivity tests. In the exudates color hue test, coffee seeds without the parchment and the silvery pellicle (four replications of 10 seeds each) were distributed on top of paper towels moistened and then maintained into a germinator, at 25 ºC for 24, 48, 72, 96, and 120 h. Three classes of color hues were established: colorless, light color hue, and dark color hue, assigning the values of 0, 1, and 3, for each class, respectively. The proposed exudates color hue test can be recommended for the fast assessment of viability for coffee seeds. The most promising results were obtained for seeds with 12% moisture content, after imbibition periods of 72, 96, and 120 h; and with 30% moisture content, after imbibition periods of 72 and 120 h.

scholarly journals TESTE DE TETRAZÓLIO EM SEMENTES DE Copaifera langsdorffii E Schizolobium parahyba

FLORESTA ◽  
2011 ◽  
Vol 41 (4) ◽  
Author(s):  
Cristiane Alves Fogaça ◽  
Nádia Graciele Krohn ◽  
Márcio De Aquino Souza ◽  
Rinaldo César de Paula
Keyword(s):  
Seed Coat ◽  
Germination Test ◽  
Schizolobium Parahyba ◽  
Copaifera Langsdorffii ◽  
Physiological Quality ◽  
Forest Seeds ◽  
Tetrazolium Test

Este trabalho objetivou padronizar o teste de tetrazólio para avaliação da viabilidade de sementes de copaíba e guapuruvu. Avaliou as seguintes metodologias: sementes escarificadas mecanicamente e embebidas por 24 e 48 horas, com posterior retirada do tegumento e imersas em solução de tetrazólio a 0,075, 0,10 e 0,20% por 2, 3 e 4 horas, a 35 ºC, no escuro. As metodologias avaliadas que foram eficientes na obtenção de coloração satisfatória, permitindo a diferenciação dos tecidos, e na avaliação da qualidade fisiológica das sementes, quando comparadas com o teste padrão de germinação, foram: para a espécie copaíba, sementes escarificadas e embebidas por 24 horas, a 35 ºC, com posterior retirada do tegumento, submetidas a solução de tetrazólio a 0,20% por 4 horas, a 35 ºC, no escuro; e para a espécie guapuruvu, sementes escarificadas e embebidas por 48 horas, a 35 ºC, com posterior retirada do tegumento, submetidas a solução de tetrazólio a 0,10% por 4 horas, a 35 ºC, no escuro.Palavras-chave: Sementes florestais; teste rápido; copaíba; guapuruvu. AbstractTetrazolium test in Copaifera langsdorffii and Schizolobium parahyba seeds. This research aimed to standardize the tetrazolium test for evaluation of viability of Copaifera langsdorffii Desf. and Schizolobium parahyba Vell. Blake seeds. It evaluated the following methodologies: seeds scarificated mechanically and soaked up by 24 and 48 hours, with posterior seed coat removal and immersed in tetrazolium solution at 0.075; 0.10 and 0.20% for 2, 3 and 4 hours, 35 ºC, the dark one. The evaluated methodologies that had been efficient in the attainment of satisfactory coloration, allowing the differentiation of tissues, and in the evaluation of the physiological quality of the seeds when compared with the germination test, had been: for the species Copaifera langsdorffii, seeds scarificated and soaked up by 24 hours, 35 ºC, with posterior seed coat removal, submitted to the tetrazolium solution 0.20% for 4 hours, 35 ºC, in the dark one, and for the species guapuruvu, seeds scarificated and soaked up by 48 hours, 35 ºC, with posterior seed coat removal, submitted to the tetrazolium solution 0.10% for 4 hours, 35 ºC, in the dark one.Keywords: Forest seeds; fast test; Copaifera langsdorffii; Schizolobium parahyba.

scholarly journals PHYSIOLOGICAL QUALITY OF SOYBEAN SEEDS UNDER MECHANICAL INJURIES CAUSED BY COMBINES

2015 ◽  
Vol 28 (4) ◽  
pp. 190-201 ◽  
Author(s):  
FÁBIO PALCZEWSKI PACHECO ◽  
LÚCIA HELENA PEREIRA NÓBREGA ◽  
GISLAINE PICOLLO DE LIMA ◽  
MÁRCIA SANTORUM ◽  
WALTER BOLLER ◽  
...  
Keyword(s):  
Moisture Content ◽  
Germination Rate ◽  
Axial Flow ◽  
Soybean Seeds ◽  
Moisture Contents ◽  
Tangential Flow ◽  
Physiological Quality ◽  
Cylinder Rotation ◽  
Tetrazolium Test

ABSTRACT: The mechanical harvesting causes injuries on seeds and may affect their quality. Different threshing mechanisms and their adjustments may also affect the intensity of impacts that machines cause on seeds. So, this study aimed at diagnosing and evaluating the effect of two combines: the first one with a threshing system of axial flow and the other one with a threshing system of tangential flow, under adjustments of concave opening (10 mm, 30 mm and 10 mm for a combine with axial flow and 3.0 mm, 15 mm and 3.0 mm for a combine with tangential flow) and three cylinder rotations on the quality of soybean seeds harvested at two moisture contents. Soybean seeds of cultivar 'ND 4910' were harvested at 16.6% moisture (mid-morning) and 13.7% moisture in the afternoon. The seeds quality was evaluated by germination tests, germination speed index (GSI), germination rate, moisture content, percentage of purity and vigor by tetrazolium test. Despite the combine, the results showed that the mechanical injury has most reduced seeds quality, at 16.6% moisture content, concave opening of 30 mm (axial) and 10 mm (tangential) and cylinder rotation of 1100 rpm (axial) and 1000 (tangential), both with the highest rotations used. The combine with tangential flow had the highest degree of seeds purity. When seeds moisture content at harvest was close to 13.7%, there was the highest seed injury, while, at 16.6%, there was the highest number of crushed soybeans, regardless the combine adjustment.

scholarly journals Foliar application of silicon and the effect on wheat seed yield and quality

2013 ◽  
Vol 35 (1) ◽  
pp. 86-91 ◽  
Author(s):  
Samantha Rigo Segalin ◽  
Caroline Huth ◽  
Thais D'Avila Rosa ◽  
Diógenes Barella Pahins ◽  
Liliane Marcia Mertz ◽  
...  
Keyword(s):  
Seed Yield ◽  
Foliar Application ◽  
Accelerated Aging ◽  
Dry Weight ◽  
Wheat Cultivars ◽  
Wheat Seed ◽  
Germination Test ◽  
Yield And Quality ◽  
Physiological Quality

Adequate nutrients for plants are important for increasing the yield and quality of the seeds produced. The objective of this study was to evaluate foliar fertilization with silicon in wheat and its effect on seed yield and physiological quality. Treatments consisted of two silicon dosages (three and six liters silicon per hectare) and the control (no silicon) and five wheat cultivars: OR "Quartzo", OR "Ônix", Fundacep "Linhagem", Fundacep "Campo Real" and Fundacep "Horizonte". The experimental design was randomized blocks with four replications. After physiological maturity, harvesting and threshing of the seeds were done manually. Seed samples were evaluated for yield and physiological quality from the germination test, first germination count, seedling dry weight, accelerated aging, electrical conductivity, 1000 seeds and hectoliter weights. The results showed that the foliar application of silicon at the dosages tested did not affect the yield and physiological quality of the seeds produced by the wheat cultivars.

scholarly journals PRODUCTION AND PHYSIOLOGICAL QUALITY OF SOYBEAN SEEDS IN ORTHIC QUARTZARENIC NEOSOIL OF THE CERRADO REGION

2015 ◽  
Vol 28 (4) ◽  
pp. 127-134
Author(s):  
CHARLINE ZARATIN ALVES ◽  
GUSTAVO MARTINS ZAQUEU ◽  
ERIC FABIANO SERAGUZI ◽  
AGUINALDO JOSÉ FREITAS LEAL ◽  
JOSUÉ BISPO DA SILVA
Keyword(s):  
Electrical Conductivity ◽  
Aerial Part ◽  
Water Distribution ◽  
Accelerated Aging ◽  
Dry Mass ◽  
Soybean Seeds ◽  
Scheme Design ◽  
Physiological Quality ◽  
Tetrazolium Test

ABSTRACT: The aim of this study was to evaluate the effect of the sowing periods in production, productivity component and physiological quality of seeds of three soybean cultivars (TMG133RR, P98Y70RR and NS7670RR) in Orthic Quartzarenic Neosoil in the cerrado region. The design used was a randomized block a factorial scheme design with four repetitions, and each plot with useful space consisted of three rows of four meters length, spaced at 0.45 meters. Field evaluations were the final stand, the height of the plants, height of the first pod insertion, the mass of 100 seeds and productivity. Already in the lab seeds were evaluated for germination and vigor (first germination count, emergency, emergence speed index, length and dry mass of the aerial part of the plant and roots, electrical conductivity, accelerated aging and tetrazolium test). It concludes that it is possible to use Orthic Quartzarenic Neosoils, located in the Cerrado region at altitudes higher than 600 m, in years and places with good water distribution in the spring-summer seasons, for grain and soybeans production, but as a first goal, the crop should be sown in the first 20 days of November otherwise it should take place in early December.

scholarly journals ELECTRICAL CONDUCTIVITY AND QUALITY OF DIFFERENT UMBEL ORDER CARROT SEEDS

2020 ◽  
Vol 9 (04) ◽  
pp. 75-81
Author(s):  
Luana de Souza Marinke ◽  
Hugo César Rodrigues Moreira Catão ◽  
Gabrielly Fernanda Francisco ◽  
Ítala Menegon Castilho ◽  
Letícia Rodrigues de Oliveira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Germination Rate ◽  
Statistical Design ◽  
Germination Test ◽  
Aerial Portion ◽  
Initial Characterization ◽  
Different Temperatures ◽  
Physiological Quality ◽  
Final Score

Carrot seeds exhibit irregular vigor due to the wide blooming period of the crop. Results from germination tests are insufficient to evaluate the physiological potential. Thus, vigor tests are used in combination with germination tests. The objective of this work was to evaluate the quality of carrot seeds from different umbel order and the electrical conductivity under different temperatures and imbibing periods. Carrot seeds from cultivar Brasilia were used to perform the experiments. Content of water, the first and the final score of the germination test, index of germination rate, and length of roots and of the aerial portion were determined in the initial characterization. The electrical conductivity test was completed with replicates containing 50 seeds, in 25 mL deionized water at 20, 25 and 30oC. Evaluations were performed with 2, 4, 6, 8, 12 and 24 hours of imbibing period. The experiment was accomplished under a completely random statistical design. The quality of carrot seeds varied according to the umbel order. Seeds of secondary umbels showed better physiological quality. The electrical conductivity test is efficient to evaluate the vigor of carrot seeds with 8 hours of imbibing period at 25°C.

scholarly journals Physiological quality of pink pepper seeds (Schinus terebinthifolia Raddi.) as a function of storage

2021 ◽  
Vol 38 (1) ◽  
pp. 144-157
Author(s):  
Thaísa De Oliveira Silveira ◽  
Madelon Rodrigues Braz ◽  
Gilmara Pires de Moura Palermo ◽  
Tiago Böer Breier
Keyword(s):  
Moisture Content ◽  
Storage Time ◽  
Storage Period ◽  
Seed Storage ◽  
Dry Weight ◽  
Native Forest ◽  
Alternative Source ◽  
Physiological Quality ◽  
And Storage

Seeds of native forest species for food and seedling production have a growing demand that impacts the need for studies involving seed storage in order to maintain good levels of germination quality. Thus, scientific analyzes that explore the physiological potential of the seeds of these species are necessary, especially for the pink pepper (Schinus terebinthifolia Raddi.), a species used as an alternative source of income for traditional communities and which has been arousing interest due to the consumption of its fruits as a condiment in the national and international market. This work aimed to assess the physiological quality of pink pepper seeds according to the storage period and seed size. The seeds came from a rural settlement, a pioneer in the extraction of pink pepper, in the state of Rio de Janeiro, Brazil. The seeds were evaluated for moisture content, germination, first count, length and dry weight of the germinated seedlings, during the period of time that they remained stored and the size of the seeds. The results allowed to conclude that: i) the germinative percentage of the stored pink pepper seeds decreased over the months; ii) the moisture content of the seeds decreased over the months evaluated iii) the different sizes of seeds did not show differences in germination and storage time and iv) values of length and dry weight of the seedlings did not differ according to the period of storage.

scholarly journals Effect of fungal incidence on physiological quality of tobacco seeds used in Brazil

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Mariane Sayuri Ishizuka ◽  
Maria Heloisa Duarte de Moraes ◽  
Maria Helena Carmignani Pescarin Chamma ◽  
Carlos Eduardo Pulcinelli ◽  
José Otavio Machado Menten
Keyword(s):  
Seed Treatment ◽  
Pathogenic Fungi ◽  
Test Results ◽  
Fusarium Spp ◽  
Germination Test ◽  
Tobacco Seed ◽  
Tobacco Seeds ◽  
Physiological Quality ◽  
Seeds Germination

ABSTRACT: The objectives of the present project were to evaluate the sanity and germination of tobacco seed samples cultivated in Brazil and to identify potential pathogenic fungi to the culture. Thirty-four representatives samples of tobacco seeds were evaluated through germination and sanity test by the blotter-test. On the germination test, results were expressed in percentage of seedlings considered normal, abnormal and non-germinated seeds. The percentage of seeds germination varied between 54.5 and 90%. According to sanity test, it was verified the incidence of Alternaria alternata, Cladosporium spp., Fusarium spp., and Phoma spp. The incidence of A. alternata varied from 3 to 67%, and Fusarium spp. varied from 0 to 19%. There was significative positive correlation between the incidence of A. alternata and the percentage of seed germination. Species of Alternaria and Fusarium can be potential pathogens to tobacco culture and an alarm for the necessity of seed treatment of the seeds that are transporting these fungi.

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