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 Evaluation of the electrical conductivity of forest seeds after digestive tract of wild birds

2018 ◽  
Vol 40 ◽  
pp. 79
Author(s):  
Sérgio Thode Filho ◽  
Heider Alves Franco ◽  
Emanuele Nunes Nunes de Lima Figueiredo Jorge ◽  
Miqueias Da Silva Fernandes ◽  
Ildemar Ferreira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Digestive Tract ◽  
Wild Birds ◽  
Individual Level ◽  
Genetic Potential ◽  
Physiological Quality ◽  
The Individual ◽  
Forest Seeds

The production of seedlings encompasses the need for knowledge of plant physiology, mainly related to seeds and their minutiae. The seed is the vehicle that carries the full genetic potential of a cultivar with superior characteristics. Vigor can be described as that seed property that determines its emergence under unfavorable conditions. According to the International Seed Testing Association (ISTA). The process of reforestation can happen through the production of seedlings and, through seed dispersal, this can occur due to the action of the plant itself (autochory), water (hydrochory), wind (anemochory), animals (zoochory), etc. The current work aimed to investigate the feasibility of using the individual electrical conductivity test to evaluate the physiological quality of seeds of forest species after passage through the digestive tract of wild birds. The results allowed inferring that the forest seeds after digestive tract of wild birds presented low electrical conductivity at the individual level. Thus, the seeds in study no presented loss force after digestive tract of wild birds.  Therefore, the birds only performed the role of individual dispersant.

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 Tests for evaluating the physiological quality of pitaya seeds

2015 ◽  
Vol 36 (6Supl2) ◽  
pp. 4047
Author(s):  
Thiago Alberto Ortiz ◽  
Aline Moritz ◽  
Lúcia Sadayo Assari Takahashi ◽  
Mariana Ragassi Urbano
Keyword(s):  
Electrical Conductivity ◽  
Pearson Correlation ◽  
Accelerated Aging ◽  
Seed Vigor ◽  
Water Volume ◽  
Germination Test ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Physiological Quality

Germination test is used to assess the physiological quality of seeds; however, since it is carried out under ideal conditions, this test has not been shown sufficient for this purpose. Instead, it is possible to use vigor tests, although the lack of standardized methodologies has reduced their applicability and reproducibility. Thus, this study aimed to develop methodologies for conducting tests of germination, accelerated aging, and electrical conductivity for the evaluation of the physiological quality of pitaya seeds. For this purpose, seeds from ripe Hylocereus undatus fruits were used. A completely randomized experimental design was used with four replications. The physiological quality of the seeds was assessed using germination, accelerated aging, and electrical conductivity tests, and the speed of germination index (SGI) and mean germination time (MGT) were determined for both the germination test and accelerated aging test. For the statistical analysis, we performed regression model adjustments and calculated the Pearson correlation coefficient (p < 0.05). The germination test for H. undatus seeds can be performed at 25 °C, with the aim of reaching the highest SGI and lowest MGT values. The accelerated aging test can be conducted at 43 °C for 48 h, because combining these factors favors the expression of seed vigor, allowing seeds to achieve the maximum SGI and minimum MGT, while reducing the time of the assay. The electrical conductivity test can be performed using 25 seeds at a temperature of 30 °C and a water volume of 10 mL, since under these conditions there is less interference from external factors on the leachate content of the solution.

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 Massal and Individual Electrical Conductivity Tests and its Relationships with the Physiological Quality of Sweet Sorghum Seeds

2020 ◽  
Vol 8 (2) ◽  
pp. 407
Author(s):  
Joner Silveira Dalcin ◽  
Caren Alessandra Müller ◽  
Ubirajara Russi Nunes ◽  
Rodrigo Roso ◽  
Alberto Cargnelutti Filho ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cold Test ◽  
Dry Mass ◽  
Shoot Length ◽  
Tukey Test ◽  
Physiological Quality ◽  
Rapid Tests ◽  
The Individual ◽  
The Relationship

Rapid tests such as electrical conductivity provide fast and consistent results regarding stratification of seed lots by vigor. They are important tools used to evaluate the physiological quality of seeds of several species, however, no such information was found for Sorghum bicolor. The objective of this study was to evaluate the relationship between the physiological quality of the seeds by the mass and individual conductivity tests. Four plots of the Fepagro 19 cultivar were analyzed through the degree of moisture, weight of one thousand seeds, first count and germination, radicular and shoot length, dry mass, cold test and emergence of field seedlings. Subsequently, they were submitted to mass electrical conductivity experiments with variations in the imbibition time (2, 4, 6, 8, 12 and 24 hours), temperature (20, 25 and 30 ºC), number of seeds (25 and 50), volume of water (50 and 75 mL) and individual (2, 4, 6, 8, 12 and 24 hours). The design was completely randomized and the data evaluated by the Tukey test. Only the lowest physiological quality batch was detected in the 20 °C, 75 mL and 25 seeds for 12 hours combinations; the individual test detected the least physiological quality batch, and it was possible to perform it in 24 hours.

scholarly journals Physiological quality of soybean seeds treated with imidacloprid before and after storage

2020 ◽  
Vol 66 (No. 10) ◽  
pp. 513-518
Author(s):  
Renata Cristiane Pereira ◽  
Murilo Fuentes Pelloso ◽  
Larissa Vinis Correia ◽  
Thaisa Cavalieri Matera ◽  
Rayssa Fernanda dos Santos ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seed Treatment ◽  
Seedling Emergence ◽  
Accelerated Aging ◽  
Soybean Seeds ◽  
Germination Test ◽  
Soybean Cultivars ◽  
Before And After ◽  
Physiological Quality

This study aimed to evaluate the effect of different slurry volume of imidacloprid insecticide on the physiological potential during the storage of seeds of three soybean cultivars. A completely randomised experimental design was adopted, in a 6 × 3 × 2 factorial scheme, which treatments were six slurry volumes with imidacloprid insecticide (0, 200, 500, 800, 1 100 and 1 400 mL/100 kg of seeds), 3 soybean cultivars (SYN15630, M5947, and NS5959) and 2 storage periods (0 and 30 days after seed treatment), with four replications. The treated seeds were stored in kraft paper bags with controlled temperature and humidity. The physiological potential of the seeds was evaluated by standard germination test, electrical conductivity, accelerated aging, seedling emergence in the sand seedbed, and the field. The germination and vigor of soybean seeds were reduced during storage, especially with the increase in the volumes of the insecticide solution.  

scholarly journals Tests for evaluating the physiological quality of pitaya seeds

2015 ◽  
Vol 36 (6Supl2) ◽  
pp. 4047
Author(s):  
Thiago Alberto Ortiz ◽  
Aline Moritz ◽  
Lúcia Sadayo Assari Takahashi ◽  
Mariana Ragassi Urbano
Keyword(s):  
Electrical Conductivity ◽  
Pearson Correlation ◽  
Accelerated Aging ◽  
Seed Vigor ◽  
Water Volume ◽  
Germination Test ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Physiological Quality

<p>Germination test is used to assess the physiological quality of seeds; however, since it is carried out under ideal conditions, this test has not been shown sufficient for this purpose. Instead, it is possible to use vigor tests, although the lack of standardized methodologies has reduced their applicability and reproducibility. Thus, this study aimed to develop methodologies for conducting tests of germination, accelerated aging, and electrical conductivity for the evaluation of the physiological quality of pitaya seeds. For this purpose, seeds from ripe <em>Hylocereus undatus </em>fruits were used. A completely randomized experimental design was used with four replications. The physiological quality of the seeds was assessed using germination, accelerated aging, and electrical conductivity tests, and the speed of germination index (SGI) and mean germination time (MGT) were determined for both the germination test and accelerated aging test. For the statistical analysis, we performed regression model adjustments and calculated the Pearson correlation coefficient (p &lt; 0.05). The germination test for <em>H. undatus </em>seeds can be performed at 25 °C, with the aim of reaching the highest SGI and lowest MGT values. The accelerated aging test can be conducted at 43 °C for 48 h, because combining these factors favors the expression of seed vigor, allowing seeds to achieve the maximum SGI and minimum MGT, while reducing the time of the assay. The electrical conductivity test can be performed using 25 seeds at a temperature of 30 °C and a water volume of 10 mL, since under these conditions there is less interference from external factors on the leachate content of the solution.</p>

scholarly journals Electrical conductivity test for evaluation of the pea seed vigor

2020 ◽  
Vol 1 (1) ◽  
pp. 89
Author(s):  
Edvan Costa da Silva ◽  
Wagner Menechini ◽  
Carolina Dos Santos Galvão ◽  
Luís Augusto Batista de Oliveira ◽  
Natália Cássia de Faria Ferreira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Pisum Sativum ◽  
Low Cost ◽  
Seed Vigor ◽  
State University ◽  
Randomized Experimental Design ◽  
Physiological Quality ◽  
Pea Seeds ◽  
The Individual

The electrical conductivity test is routinely used to differentiate the physiological quality of seed lots, and has stood out for its ease of execution, low cost, speed, repeatability, and straightforward interpretation of results. This study aimed to establish a methodology for the electrical conductivity test in pea seeds (Pisum sativum L.) involving seed quantity and seed imbibition periods. The experiment was carried out at the Multidisciplinary Laboratory of the State University of Goiás, the campus of Ipameri Campus, in 2018. Pea seeds (Pisum sativum) stored in the seed laboratory of the same institution were used for this experiment. The completely randomized experimental design with four replications in a 4x6 factorial scheme was used. Four quantity of seeds (25, 50, 75, and 100 seeds) and six imbibition periods (4, 8, 12, 16, 20, and 24 h) at 25ºC were evaluated. The electrical conductivity test was performed with four replicates of 25, 50, 75, and 100 seeds each, weighed on a precision scale (0.001g) and placed in disposable plastic cups, with a capacity of 200 mL, containing 75 mL of distilled water. The cups were then kept in a BOD chamber, set at 25°C, and the measuring was performed after 4, 8, 12, 16, 20, and 24 h of imbibition with a conductivity meter and results were expressed in μS cm-1 g-1. There were no significant results for the interaction between the number of seeds and the imbibition time. Significant results were observed only for the individual effects of each factor. It is recommended to use 100 seeds of Maria pea, and 24 h for the electrical conductivity test.

scholarly journals System models for resilience in gerontology: application to the COVID-19 pandemic

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Katarzyna Klasa ◽  
Stephanie Galaitsi ◽  
Andrew Wister ◽  
Igor Linkov
Keyword(s):  
The Elderly ◽  
System Level ◽  
Improve Quality ◽  
Care Needs ◽  
Individual Level ◽  
Chronic Stressors ◽  
The World ◽  
Aging Adults ◽  
The Individual

AbstractThe care needs for aging adults are increasing burdens on health systems around the world. Efforts minimizing risk to improve quality of life and aging have proven moderately successful, but acute shocks and chronic stressors to an individual’s systemic physical and cognitive functions may accelerate their inevitable degradations. A framework for resilience to the challenges associated with aging is required to complement on-going risk reduction policies, programs and interventions. Studies measuring resilience among the elderly at the individual level have not produced a standard methodology. Moreover, resilience measurements need to incorporate external structural and system-level factors that determine the resources that adults can access while recovering from aging-related adversities. We use the National Academies of Science conceptualization of resilience for natural disasters to frame resilience for aging adults. This enables development of a generalized theory of resilience for different individual and structural contexts and populations, including a specific application to the COVID-19 pandemic.

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