Envelhecimento acelerado para avaliação do potencial fisiológico de sementes de melão

Torres, Salvador Barros; Oliveira, Fabrícia Nascimento de; Oliveira, Andreya Kalyana de; Benedito, Clarisse Pereira; Marinho, Jean C

doi:10.1590/s0102-05362009000100014

Cited by 7 publications

(9 citation statements)

References 14 publications

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“…It is worth highlighting that according to Elias et al (2012), the electrical conductivity test is not effective to evaluate the vigor of seeds from all cultures, since generally the presence of a semipermeable membrane with nuclear origin allows the inlet of water, but not the diffusion of certain electrolytes outside the cell. This behavior was also observed for zucchini (Dutra and Vieira, 2006) and melon (Torres et al, 2009) seeds, where the electrical conductivity did not present compatible results with the ones from the other vigor tests.…”

Section: Resultsmentioning

confidence: 58%

Physiological maturity and drying speed in the quality of zucchini ( Cucurbita pepo L.) seeds

et al. 2017

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-Harvesting and drying are essential procedures to obtain high quality seeds as well as for their conservation during storage. The goal of this research was to identify the physiological maturity stage and to verify the effect of drying speeds on the quality of zucchini seeds. A completely randomized design in a 3x2x2 factor scheme was used, involving three fruit maturation stages (49, 56 and 63 days after anthesis -DAA), two drying speeds (slow and quick) and two storage periods (0 and 6 months). Seed quality was evaluated by germination, first count, accelerated aging, electrical conductivity, tetrazolium, seedling emergence, emergence speed index and seed health test. Moisture content, thousand seed mass and percentage full seeds were also evaluated. Zucchini seeds reach maximum quality at 49 DAA. Slow or quick drying and storage do not affect the physiological quality of seeds that were harvested at 49 DAA. The delayed harvest of fruits reduces the quality of seeds. Quick drying reduces the incidence of the fungi Alternaria, Cladosporium, Phoma and Fusarium, and increases the occurrence of Aspergillus and Penicillium.Index terms: Cucurbita pepo L., storage, deterioration, seed health test.Maturidade fisiológica e velocidade de secagem na qualidade de sementes de abobrinha (Cucurbita pepo L.)RESUMO -A colheita e secagem são procedimentos essenciais para obtenção de sementes de elevada qualidade, bem como, para sua conservação durante o armazenamento. O objetivo nesta pesquisa foi identificar o estádio de maturidade fisiológica e verificar o efeito de velocidades de secagem sobre a qualidade de sementes de abobrinha. Utilizou-se o delineamento inteiramente casualizado em esquema fatorial 3x2x2, envolvendo três estádios de maturação de frutos (49, 56 e 63 dias após a antese -DAA), duas velocidades de secagem (lenta e rápida) e dois períodos de armazenamento (0 e 6 meses). A qualidade das sementes foi avaliada pelos testes de germinação, primeira contagem, envelhecimento acelerado, condutividade elétrica, tetrazólio, emergência de plântulas, índice de velocidade de emergência e sanidade. Também foi determinado o teor de água, massa de mil sementes e porcentagem de sementes cheias. As sementes de abobrinha atingem máxima qualidade aos 49 DAA. A secagem lenta e rápida e o armazenamento não influenciam a qualidade fisiológica das sementes colhidas aos 49 DAA. O atraso da colheita dos frutos reduz a qualidade das sementes. A secagem rápida reduz a incidência dos fungos Alternaria, Cladosporium, Fusarium e Phoma, e aumenta a ocorrência de Aspergillus e Penicillium.Termos para indexação: Cucurbita pepo L., armazenamento, deterioração, sanidade.1

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Section: Resultsmentioning

confidence: 58%

Physiological maturity and drying speed in the quality of zucchini ( Cucurbita pepo L.) seeds

et al. 2017

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“…However, it is important to emphasize that saline stress causes, besides water restriction, toxic effects due to the absorption of ions, and this can cause variance in the responses (Ibrahim, 2016). Higher potentials usually cause a drastic reduction in germination, as stated by Torres et al (1999), who observed a decrease of 50% in germination of cucumber seeds at the potential of -0.8 MPa.…”

Section: Resultsmentioning

confidence: 99%

“…Accelerated aging: a sample of 250 seeds was distributed on screens coupled to gerboxes containing 40 mL of distilled water in the bottom. The boxes were capped and maintained in a BOD incubator at 42 °C for 72 hours (Torres et al, 2009). After this period, the seeds were put to germinate according to the germination test.…”

Section: Methodsmentioning

confidence: 99%

“…According to this principle, the water stress test (AOSA, 2002) is based on the fact that more vigorous seeds can tolerate more severe conditions of water stress (Hadas, 1977). In view of this, Vaz- de-Melo et al (2012) concluded that the germination values showed a high correlation with the vigor levels of maize seeds under water stress.…”

Section: Introductionmentioning

confidence: 97%

“…Many studies have been performed relating water potential and seed performance. Torres et al (1999), when working with water potential of 0, -0.2, -0.4, -0.6 and -0.8 MPa, observed that potentials equal to or lower than -0.4 MPa could be considered critical to germination and development of cucumber seedlings. Abreu et al (2014) evaluated the behavior of five maize lineages under water stress, and they observed that the potential of -0.9 MPa affected considerably the physiological quality of the seeds.…”

Section: Introductionmentioning

confidence: 99%

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Germination of melon seeds under water and thermal stress

2017

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Seeds vigor can influence seed performance under stress conditions. The objectives of this study were to evaluate the effect of water and thermal stress on germination and performance of melon seedlings, and to verify if germination under stress conditions is an efficient parameter to evaluate the vigor of these seeds. Four lots of ‘Golden Mine’ melon had their initial quality characterized by germination, first count, accelerated aging and seedling emergence tests. Germination under water stress was performed on a paper moistened with PEG 6000 solution at 0.06, -0.3, -0.6 and -0.9 MPa. The percentage and speed of germination, length and dry mass of the seedlings were evaluated. For the thermal stress experiment, cold test and germination at sub- (15 ºC) and supra-optimal (35 ºC) temperatures were performed, as well as at the ideal temperature (25 ºC). The germination of melon seeds under water stress induced by PEG 6000 at -0.3 and -0.6 MPa is an efficient method to detect differences in the physiological potential of lots of melon seeds, but these differences disappear under severe water stress (-0.9 MPa). Germination under sub-optimal temperatures also allows to identify differences in seeds performance and to classify them according to the vigor level.

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Avaliação do potencial fisiológico de sementes de pepino utilizando sistema computadorizado de análise de imagens de plântulas (SVISR), em comparação com procedimentos tradicionais

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Envelhecimento acelerado para avaliação do potencial fisiológico de sementes de melão

Cited by 7 publications

References 14 publications

Physiological maturity and drying speed in the quality of zucchini ( Cucurbita pepo L.) seeds

Physiological maturity and drying speed in the quality of zucchini ( Cucurbita pepo L.) seeds

Germination of melon seeds under water and thermal stress

Avaliação do potencial fisiológico de sementes de pepino utilizando sistema computadorizado de análise de imagens de plântulas (SVISR), em comparação com procedimentos tradicionais

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