Teste de condutividade elétrica para determinação do potencial fisiológico de sementes de aveia branca

Sponchiado, Julhana Cristina; Souza, Clóvis Arruda; Coelho, Cileide Maria Medeiros

doi:10.5433/1679-0359.2014v35n4suplp2405

Cited by 12 publications

(13 citation statements)

References 5 publications

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“…The EC test has been recognized as an effective way to evaluate seed vigor in various species, including black oats (MENEZES et al, 2007), popcorn (RIBEIRO et al, 2009) and white oats (SPONCHIADO et al, 2014). However, this was not found to be an efficient option for determining quality differences between sorghum seed lots (SOARES et al, 2010) or castor bean seed lots (MENDES et al, 2010) of different vigor levels.…”

Section: Resultsmentioning

confidence: 99%

Respiratory activity in wheat seeds as related to physiological quality

Dode¹,

Almeida²,

Deuner³

et al. 2016

Biosci. J.

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Seeds are a very important input for crops, and the use of low quality seeds and/or inadequate management affects the germination and hampers seedling emergence, which reduces the plant stand. There is a critical need for the development of rapid methods, which are both reliable and easy to perform, for evaluating the physiological potential of seeds. This would streamline the decision-making process regarding the management of lots and allow for the identification of seed lots of inadequate quality in the seed processing unit, which could then be discarded, and would consequently result in reduced costs associated with unnecessary processing. However, it is important that these methods are low cost and quick to perform. The aim of this study was to evaluate the correlation of respiratory activity of wheat seed, through Pettenkofer test, with tests that evaluate seeds physiological quality. We selected a seed lot of high physiological quality, then subjected the seeds to adverse temperature and relative humidity conditions to obtain different vigor levels. The adverse conditions used were 42ºC and 100% relative humidity, for periods of 6, 36, 66 and 96 hours. This process obtained seeds of five vigor levels which were subjected to the following tests: germination, field emergence, electrical conductivity, shoot and root length, total dry mass and respiratory activity. The results showed a negative correlation between respiratory activity and germination, emergence, shoot and root length and dry weight, whereas germination and emergence were strongly correlated with respiratory activity, r = -0.86 and r = -0.81, respectively. There was a significant positive correlation between conductivity and respiratory activity. Therefore, the respiratory activity test using the Pettenkofer method was correlated with other vigor tests, and allowed the classification of wheat seeds into lots of different levels of quality.

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Section: Resultsmentioning

confidence: 99%

Respiratory activity in wheat seeds as related to physiological quality

Dode¹,

Almeida²,

Deuner³

et al. 2016

Biosci. J.

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“…Conforme observado, embora os lotes apresentem diferenças quanto ao potencial fisiológico, verificou-se uniformidade no teor de água das sementes, uma vez que a diferença entre os lotes foi de no máximo 0,3 pontos percentuais, valor esse inferior à amplitude aceita, de 1 a 2 pontos percentuais (Marcos-Filho, 2015), e dentro da faixa recomendada para a realização do teste de condutividade elétrica, de 10 a 17% (Krzyzanowski e Vieira, 1999). Esse fato é importante para a execução dos testes, pois deve haver uniformidade do teor de água inicial para a obtenção de resultados consistentes neste teste (Vieira et al 2002), evitando diferenças na atividade metabólica, na velocidade de umedecimento e na intensidade de deterioração das sementes por diferenças iniciais de umidade (Sponchiado et al 2014).…”

Section: Resultsunclassified

Potencial Fisiológico De Sementes De Feijão-Caupi Submetidas À Pré-Hidratação

Nunes

Pinheiro

Dutra

2019

Rev. Agric. Neotrop.

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A utilização de sementes de boa qualidade é fundamental para o estabelecimento adequado de uma lavoura. Para uma análise mais precisa da qualidade de sementes, faz-se necessária a complementação das informações fornecidas pelo teste de germinação com os testes de vigor, que dentre eles se destaca o de condutividade elétrica, por ser considerado rápido, simples e confiável. O presente trabalho objetivou avaliar a influência da pré-hidratação na eficiência do teste de condutividade elétrica na avaliação do potencial fisiológico em seis lotes de sementes de feijão-caupi cv. Setentão. Inicialmente, procedeu-se à caracterização dos lotes pela determinação do teor de água e pelos testes de germinação e vigor (primeira contagem, índice de velocidade de germinação, emergência em campo, envelhecimento acelerado e condutividade elétrica). Posteriormente, as sementes foram submetidas aos tratamentos de pré-hidratação em substrato úmido por 0, 6, 9, 12, 15 e 18 horas antes da imersão em água, e realizada nova leitura. Tempos de pré-hidratação a partir de nove até quinze horas podem ser utilizados para identificação de diferenças mais sensíveis na qualidade fisiológica de sementes de feijão-caupi.

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“…The EC assessment is efficient in classifying seed lots according to vigor (Sponchiado et al, 2014). The highest values of EC were observed for the seed lots with low vigor.…”

Section: Discussionmentioning

confidence: 96%

Physiological potential of wheat seeds produced under light restriction

Cigel

Souza

Kandler

et al. 2021

Agraria

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The low radiation intensity can negatively affect the production of photoassimilates in plants for allocation and synthesis of reserves into seeds. This study aimed to evaluate the physiological quality of wheat seeds produced by plants imposed on conditions of light reduction in different phenological stages, remaining until the end of the cycle. The experiment was carried out in a greenhouse in 2018, with a completely randomized design, with 11 treatments and 20 repetitions. The treatments consisted of 11 seed lots: 10 of plants grown in artificial shade (70%) started in the Zadoks code's phenological stages: 23; 30; 35; 45; 55; 60; 65; 70; 75; 80 and control lot (without shading). The seeds were analyzed for germination and vigor. Seed germination was not affected. There was a reduction in vigor through the tests of accelerated and cold aging when the shading started between stages 55 and 65, but with a minimum vigor of 93 and 94%, respectively. It is concluded that the restriction of light during the development of wheat plants does not affect the germination of the seeds produced but impairs the vigor mainly when imposed in the reproductive phases.

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Teste de condutividade elétrica para determinação do potencial fisiológico de sementes de aveia branca

Cited by 12 publications

References 5 publications

Respiratory activity in wheat seeds as related to physiological quality

Respiratory activity in wheat seeds as related to physiological quality

Potencial Fisiológico De Sementes De Feijão-Caupi Submetidas À Pré-Hidratação

Physiological potential of wheat seeds produced under light restriction

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