Teste de lixiviação de potássio para a avaliação do vigor de sementes de arroz

Barbieri, Ana Paula Piccinin; Menezes, Nilson Lemos de; Conceição, Gerusa Massuquini; Tunes, Lilian Vanussa Madruga de

doi:10.1590/s0101-31222012000100015

Cited by 12 publications

(11 citation statements)

References 9 publications

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“…Due to difficulties found concerning germination among forest species, alternative tests, like water imbibition curve and electrical conductivity tests under controlled conditions are being applied in many laboratories with the objective of defining seed vigor and viability. The fastness in obtaining reliable results is one of the main aspects considered in the evaluation of seed quality, for it allows agility in decision making, enables its use in wider scales, decreasing the risks and costs in operations like harvest, processing, storage and commercialization (Barbieri, Menezes, Conceição, & Tunes, 2012;Hilst, Dias, Alvarenga, & Souza, 2012;Matos, Borges, & Silva, 2015).…”

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confidence: 99%

Water absorption and improvement of methods for electrical conductivity test in acacia seeds

Oliveira

Smiderle

Paulino

et al. 2016

RBT

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Abstract:Acacia is an important forest species of rapid growth whose seeds have tegument dormancy. In this work it was intended to characterize water absorption pattern after seed dormancy break, and to determine the amount of water, container size and the need of breaking the tegument dormancy, as to perform electrical conductivity test in small and large seeds of Acacia mangium (Fabaceae). The seeds were collected from 10, 8 and 6 years old trees established in poor yielding-capacity soils on savannah areas of Roraima, Brazil; seeds were classified in six lots concerning to seed size and tree age. Germination tests (50 seeds and four replications per lot) were carried out on germitest® paper maintained on gerbox at 25 °C. Imbibition was verified by seed weighing at different times (0, 2, 5, 8, 12, 16, 24, 36, 48, 60, 72, 84, 96 and 120 hours). The electrical conductivity test consisted of three experiments, distinguished by the amount of water used and by the container size in which seeds were immersed. Seeds of A. mangium coming from 10 years old trees presented increased germination percent and germination speed than seeds of six-year old trees. Small seeds presented increased in electrical conductivity and water absorption until 120 hours when compared to large seeds. The immersion of seeds of A. mangium in 40 mL of distilled water into 180 mL plastic containers, after dormancy break, it is indicated for the determination of electrical conductivity test. The ratio of electrolytes by seed mass, after 24 hours of immersion in water, turns electrical conductivity test more accurate concerning A. mangium seeds. Rev. Biol. Trop. 64 (4): 1651-1660. Epub 2016 December 01.

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confidence: 99%

Water absorption and improvement of methods for electrical conductivity test in acacia seeds

Oliveira

Smiderle

Paulino

et al. 2016

RBT

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“…According to Favorato, Rocha, Espindula, Souza, and Paula (2011), Barbieri, Menezes, Conceição, and Tunes (2012) and Zucareli et al (2013), ions with the highest concentrations in the leached solution are potassium, magnesium and calcium; they can therefore be used in the vigour test. In this work, calcium was the ion with the highest leaching concentration, diverging from the results obtained by these authors, as already mentioned.…”

Section: Resultsmentioning

confidence: 99%

Foliar application of plant growth regulators changes the physiological quality of crambe seeds

Boiago

Coelho

Fernandes

et al. 2019

Acta Sci. Biol. Sci.

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The application of plant growth regulators can manipulate the development of cultivated plants, and their physiological effects may be reflected in the physiological quality of the seeds. This study evaluated the effects of plant growth regulators (PGR) on the physiological quality of crambe seeds produced in the 2014 and 2015 harvests. During crop development, we applied two foliar sprayings of the following treatments: 1) control treatment with distilled water; 2) indole-3-acetic acid 100 mg L-1 (IAA); 3) 3-gibberellic acid P.A. 100 mg L-1 (GA3); 4) commercial PGR Stimulate® 6 mL L-1. The seeds were harvested and evaluated for water content, germination percentage and germination speed index (GSI), electrical conductivity and concentrations of leached Ca, Mg and K ions. Means were compared by Tukey´s and Dunnett tests (p<0.05). Applying Stimulate® increased the germination percentage and the germination speed index, while IAA application showed an opposite effect, increasing the electrical conductivity of crambe seeds. Calcium leaching decreased with IAA application, and all regulators reduced K leaching. We therefore infer that the application of plant growth regulators influences the physiological quality of crambe seeds.

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“…Foi observado, ainda, que, em todas as combinações do teste de condutividade elétrica, os eletrólitos lixiviados pelas sementes aumentaram linearmente, durante a embebição, constatação feita, também, por Barbieri et al (2012), com sementes de arroz.…”

Section: Resultsunclassified

Qualidade fisiológica de sementes de girassol avaliadas por condutividade elétrica

Oliveira

Torres

Vieira

et al. 2012

Pesqui. Agropecu. Trop.

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INTRODUÇÃOO girassol (Helianthus annuus L.) está entre as cinco maiores culturas produtoras de óleo vegetal comestível do mundo, ficando apenas atrás da soja, algodão, colza e amendoim (Fagundes 2002). A demanda por sementes de girassol tem aumentado, devido à importância econômica do óleo extraído de seus aquênios, utilizado, principalmente, para consumo humano e animal, bem como matéria-prima para a produção de biocombustível (Ungaro 2006). Segundo Scheeren et al. (2010), conhecer a qualidade das sementes antes da semeadura é o procedimento mais correto e seguro para se evitar aumentos no custo da lavoura. Pesquisas com o girassol, principalmente na área de controle de qualidade de sementes, são essenciais para o estabelecimento da cultura e se justificam pela potencialidade da espécie. Logo, torna-se imprescindível ajustar tecnologias para a produção de sementes, que permitam homogeneizar o processo de germinação, bem como reduzir o tempo de germinação entre lotes, facilitan- Physiological quality of sunflower seeds according to electrical conductivity ABSTRACT RESUMOThe seed quality evaluation is essential in quality control programs. Thus, vigor tests have been developed to differentiate seed lots, due to the limitations of the germination test. This study aimed at evaluating the electrical conductivity test efficiency for determining the physiological quality of sunflower seeds. Ten lots of sunflower seeds (Catissol and Multissol cultivars) were used. Initially, the quality of each lot was determined, besides the seeds moisture content, by using tests of germination, first counting and seedling emergence, in a greenhouse. Then, the seeds were submitted to the electrical conductivity test, for four soaking periods (6, 12, 18 and 24 hours), by using disposable plastic cups containing 25 and 50 seeds, in 50 mL and 75 mL of deionized water, at 25°C and 30°C. The experimental design was completely randomized, in a 5x4 factorial scheme (five lots and four soaking periods), separately for each cultivar, with four replications. It was possible to conclude that the electrical conductivity test combining 25°C, 75 mL of deionized water and 50 seeds was sufficiently sensitive to evaluate the physiological quality of sunflower seeds.

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Teste de lixiviação de potássio para a avaliação do vigor de sementes de arroz

Cited by 12 publications

References 9 publications

Water absorption and improvement of methods for electrical conductivity test in acacia seeds

Water absorption and improvement of methods for electrical conductivity test in acacia seeds

Foliar application of plant growth regulators changes the physiological quality of crambe seeds

Qualidade fisiológica de sementes de girassol avaliadas por condutividade elétrica

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