scholarly journals Teste de condutividade elétrica em sementes de Jacaranda micranta

2016 ◽  
Vol 36 (85) ◽  
pp. 79 ◽  
Author(s):  
Gabriela Fernanda Souza ◽  
Juliana Garlet ◽  
Pricila Delazeri
Keyword(s):  
Electrical Conductivity ◽  
Forest Species ◽  
Significant Difference ◽  
Physiological Quality

O objetivo deste trabalho foi avaliar a qualidade fisiológica de lotes de sementes de Jacaranda micranta Cham., pelo teste de condutividade elétrica. Foram utilizados três lotes de sementes, armazenados por diferentes períodos. O teste de condutividade elétrica foi realizado em diferentes quantidades de sementes e água deionizada para embebição, sendo depois associados a dados de germinação e vigor. Foi observado que quanto maior o tempo de armazenamento das sementes, maior seu valor de condutividade elétrica e, consequentemente, menor seu vigor de germinação. Verificou-se também que as diferentes quantidades de sementes e de volume de água na embebição não apresentam diferença significativa. Assim, recomenda-se a utilização de 50 sementes em 75 mL de água deionizada.Electrical condutivity test in Jacaranda micacrantha seedsThe objective of this study was to evaluate the physiological quality of Jacaranda micranta Cham. seeds, by electrical conductivity test. We used three lots of seeds, stored for different periods. Electrical conductivity tests were conducted at different amounts of seeds and deionised water for soaking, and then they were associated with germination and vigour data. It was observed that the longer the seeds were storage, the greater their electrical conductivity, and therefore the lower were their germination vigour. It was also observed that different quantities of seeds and soaking water did not present significant difference, so it is recommended to use 50 seeds in 75 mL of deionised water.Index terms: Vigor tests; Forest species; Caroba; Physiological quality of seeds

scholarly journals Evaluation of the seedvigor of Tournefortia paniculata Cham. post-digestive tract of the ruby-crowned tanager Tachyphonus coronatus (Vieillot, 1822)

2019 ◽  
Vol 41 ◽  
pp. 15
Author(s):  
Sérgio Thode Filho ◽  
Heider Alves Franco ◽  
Emanuele Nunes de Lima Figueiredo Jorge ◽  
Mariana De Souza Oliveira ◽  
Jhon Lenon Genovez de Oliveira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Digestive Tract ◽  
Digestive System ◽  
Forest Species ◽  
Ecological Process ◽  
Germination Test ◽  
Individual Level ◽  
Physiological Quality ◽  
The Individual

Endozoochory (dispersion with passage through the digestive system of animals) is one of the most important processes. It is included in the ecological process known as dispersive mutualism, benefit the species involved. The most used method to evaluate the physiological quality of seeds is carried out based on the traditional germination test. However, electrical conductivity tests with seeds of forest species are still scarce, especially those developed with the individual method, which provide greater fidelity to the results so that through this one can define the test by the mass methods. The current work aimed to investigate the vigor, from the electrical conductivity of the seeds of Tournefortia paniculata Cham. after passage through the digestive tract of a ruby-crowned tanager Tachyphonus coronatus (Vieillot, 1822). An expedition was conducted in a fragmented area of Atlantic Forest in process of reforestation in the campus of the IFRJ. After the capture of the passerine with mist nets, proceeded the identification of seeds shed in its feces. The experimental design was completely randomized with one treatments with five replicates. The results allowed concluded that the seed of the T. paniculata Cham. after digestive tract of the ruby-crowned tanager presented high electrical conductivity in three of its replicates at the individual level. 

scholarly journals Size and vigor of Anadenanthera colubrina (Vell.) Brenan seeds harvested in Caatinga areas

2017 ◽  
Vol 39 (4) ◽  
pp. 363-373 ◽  
Author(s):  
Jaciara de Souza Bispo ◽  
Danielle Carolina Campos da Costa ◽  
Samara Elizabeth Vieira Gomes ◽  
Gilmara Moreira de Oliveira ◽  
Janete Rodrigues Matias ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dry Matter ◽  
Folk Medicine ◽  
Germination Percentage ◽  
Climate Variations ◽  
Randomized Design ◽  
Mother Plants ◽  
Physiological Quality ◽  
Completely Randomized Design

Abstract: Angico is a species found in several environments in Brazil, with several applications. It is used in the timber industry and mainly in folk medicine. In order to verify a variation in the biometric characteristics and the quality of seeds from different mother-plants in different harvesting years, the following variables were studied: moisture content, diameter, density, electrical conductivity, fresh and dry matter of seedlings, germination percentage and kinetics, in a completely randomized design with a 2x3 factorial arrangement (lots x size). The obtained results showed that angico seeds from different lots showed different physiological quality, possibly due to the climate variations to which mother-plants were submitted in the different years. Seed size directly interferes with seedling growth under both controlled and greenhouse conditions, and it can be used as a vigor indicator for angico seeds.

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.

Patents for the Physiological Quality in Seeds of Peach Rootstock Classified by Weight and Stored for Different Periods

2019 ◽  
Vol 10 (2) ◽  
pp. 124-130 ◽  
Author(s):  
Aline G. Souza ◽  
Oscar J. Smiderle ◽  
Renata D. Menegatti ◽  
Marcos Aurélio C. de Lima ◽  
Tainá R. das Neves ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Experimental Design ◽  
Growth Analysis ◽  
Prunus Persica ◽  
Stone Fruit ◽  
Germination Test ◽  
Experimental Conditions ◽  
Physiological Quality

Background: Among stone fruit, the peach (Prunus persica (L) Batsch) is one of the most widely grown species in Brazil, in both area cultivated and in production. Objective: The aim of this study was to evaluate the physiological quality of heavy and light seeds of four cultivars of Prunus persica for two storage periods, from tests of electrical conductivity, germination, and an analysis of initial plantlets growth. Methods: The Electrical Conductivity test (EC) was conducted in a Completely Randomised Design (CRD), in a 4 x 2 x 5 factorial scheme with five replications. The germination test was carried out in CRD, in a 4 x 2 factorial scheme with eight replications. The physiological quality of the seeds was determined at zero and twelve month’s storage. For the growth analysis, the experimental design was in CRD, in a 4 x 2 factorial scheme with four replications. Results: Under the conditions of the present study, it was found that the tests of germination and electrical conductivity were complementary in evaluating physiological quality in seeds of Prunus persica rootstock, suggesting that independent of the weight of the seeds, in ‘Capdeboscq’, ‘Aldrighi’, ‘Okinawa’ and ‘Okinawa Roxo’, there is a loss of quality and viability when the seeds are stored for a period of 12 months. Conclusion: Under the experimental conditions of the present study, it was concluded that storage for a period of 12 months in Recent patents is not rather recommendable for maintaining quality and viability in seeds of Prunus persica of the Capdeboscq, Aldrighi, Okinawa and Okinawa Roxo cultivars.

scholarly journals Sodium hypochlorite in the priming of tobacco seeds

2019 ◽  
Vol 41 (1) ◽  
pp. 108-111
Author(s):  
Camila Aparecida Lopes ◽  
Maria Laene Moreira de Carvalho ◽  
Renato Mendes Guimarães ◽  
Ariadne Morbeck Santos de Oliveira ◽  
Dayliane Bernardes de Andrade
Keyword(s):  
Electrical Conductivity ◽  
Sodium Hypochlorite ◽  
Tobacco Industry ◽  
Germination Index ◽  
Commercial Cultivar ◽  
Tobacco Seeds ◽  
Physiological Quality ◽  
Water Contents ◽  
Priming Technique

Abstract: Due to the non-uninform maturation of tobacco fruits and seeds, the priming technique has been used by the tobacco industry as a way of increasing the uniformity and germinations peed of seeds. Several factors can affect priming, including the time and environment in which the treatment is performed. In order to evaluate the effect of sodium hypochlorite as priming agent at different concentrations and the priming period on the physiological quality of the tobacco seeds, it was used a seed lot of commercial cultivar CSC 439 from the Virginia varietal group, widely used by the producing companies. The seeds were subjected to priming in aerated solution at different priming periods (180, 60, 30, 15, and 5 min) and concentrations of sodium hypochlorite (1%, 0.50%, 0.25%, and 0.10 %). The physiological quality was evaluated by the water contents, germination tests, first count, germination index, initial and final stands, emergence index and electrical conductivity. The priming with sodium hypochlorite did not affect germination, but allowed a higher percentage and speed of emergence when using the 1% concentration for 180, 30 and 15 min.

scholarly journals Evaluation of the physiological quality of anadenenthera peregrina (L.) Speg. seeds during storage

2009 ◽  
Vol 33 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Daniel Santos Pinho ◽  
Eduardo Euclydes de Lima e Borges ◽  
Viviana Borges Corte ◽  
Luiz Carlos Bhering Nasser
Keyword(s):  
Electrical Conductivity ◽  
Storage Temperature ◽  
Storage Period ◽  
Seed Priming ◽  
Seed Moisture ◽  
Physiological Quality ◽  
Viable Seeds ◽  
Cold Chamber ◽  
Constant Percentage

The aim of this experiment was to evaluate the effect of storage temperature on the viability and vigour of A. peregrina seeds. Seeds of A. peregrina harvested in Viçosa-MG, in September 2005 were used. The seeds were stored in the Laboratory of Forest Seeds Analysis (LASF) of the Universidade Federal de Viçosa (UFV), in a cold chamber, under approximately 5ºC over150 days. The seeds were stored under 20ºC for 150 days more. Seed moisture was determined after oven-drying at 105 ± 3ºC for 24 hours. The seeds were analyzed monthly using germination, tetrazolium and electrical conductivity tests and Osmopriming during 300 days, with four repetitions of 25 seeds. A. peregrina seeds kept a constant percentage of germination and viable seeds under the tetrazolium test for five months of storage, under either 5ºC and 20ºC. The electrical conductivity test showed significant differences in relation to the storage period, proving to be more sensitive than the standard germination test. Seed priming in PEG -0,4 MPa solution was not efficient in recovering the viability and vigor of the stored seeds at 5ºC and 20ºC.

scholarly journals Methodology of the tetrazolium test for assessing the viability of seeds of Eugenia brasiliensis Lam., Eugenia uniflora L. and Eugenia pyriformis Cambess

2014 ◽  
Vol 36 (4) ◽  
pp. 427-434 ◽  
Author(s):  
Edmir Vicente Lamarca ◽  
Claudio José Barbedo
Keyword(s):  
Electrical Conductivity ◽  
Seed Viability ◽  
Important Method ◽  
Eugenia Uniflora ◽  
Fruit Species ◽  
Incubation Periods ◽  
Physiological Quality ◽  
Different Levels ◽  
Tetrazolium Test

Eugenia brasiliensis Lam. ("grumixameira"), Eugenia uniflora L. ("pitangueira") and Eugenia pyriformis Cambess. ("uvaieira") are forest and fruit species of pharmacological and gastronomic potential and have desiccation-sensitive seeds. The development of quick viability tests for the assessment of physiological quality of these seeds is needed. The tetrazolium test is an important method providing fast assessment of the seed physiological quality. Thus, this work aimed to develop a method for the tetrazolium test for determining viability of "grumixameira," "pitangueira" and "uvaieira" seeds. Initially the seeds of these species were soaked in water for 3 h at 25 ºC. Three concentrations of tetrazolium solutions were analyzed (0.100 %, 0.125 % and 0.250 %) for seed staining using three incubation periods (2, 3 and 6 h) at 35 ºC in the dark. After staining, seed viability was determined. Then, the seeds were subjected to different levels of controlled drying and were analyzed for their physiological quality by germination and electrical conductivity tests. The tetrazolium test is a suitable tool for determining viability after staining the seeds at 35 ºC using a 0.250 % concentration solution for 3 hours for "grumixameira" seeds, 0.125 % for 3 hours for "pitangueira" seeds and 0.100 % for 2 hours for "uvaieira" seeds.

scholarly journals Vigor tests in seeds creole of Phaseolus lunatus L.

2019 ◽  
Vol 35 (5) ◽  
Author(s):  
Maria das Graças Rodrigues do Nascimento ◽  
Maria Lúcia Maurício da Silva ◽  
Edna Ursulino Alves ◽  
Caroline Marques Rodrigues ◽  
Maria Joelma da Silva
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Dry Mass ◽  
Phaseolus Lunatus ◽  
High Productivity ◽  
Randomized Design ◽  
Seed Analysis ◽  
Seedling Length ◽  
Physiological Quality

Seeds with a good physiological quality are essential to high productivity. However, for some seeds, Phaseolus lunatus L., the viability and vigor analyze show deficiency in quality. This work aimed to evaluate the physiological quality of Phaseolus lunatus L. seeds using several vigor tests. The study was realized at the Laboratory of Seed Analysis of the Agricultural Sciences Center of the Federal University of Paraíba, in Areia – PB, Brazil. We used seeds from five cultivars of P. lunatus (Branca, Orelha de Vó, Cearense, Rosinha, and Roxinha). To determine the physiological quality, we measured the water content, the viability and vigor test (germination, emergence, electrical conductivity, tetrazolium, first germination count and emergence, seedling length and dry mass). We used a completely randomized design for seeds evaluation, and the field test was performed in randomized blocks. The water content of P. lunatus did not differ among the cultivars, indicating a uniformity in the percentage of moisture. Also, the percentage and speed of emergency and the dry mass of seedlings did not differ among the varieties. The tetrazolium and electrical conductivity tests indicated that Rosinha cultivar had the worst viability concerning the other cultivars, showing a low percentage of living tissue and lower electrical conductivity. The seeds of Roxinha cultivar had the better physiological quality, and the Cearense cultivar had the worst quality evaluation. We recommend the tetrazolium test but not the electrical conductivity test to evaluate the vigor of P. lunatus.

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.

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