Testes de vigor para avaliação do potencial fisiológico de sementes de mamona (Ricinus communis L.)

Mendes, Rita de Cássia; Dias, Denise Cunha Fernandes dos Santos; Pereira, Márcio Dias; Dias, Luíz Antônio dos Santos

doi:10.1590/s1413-70542010000100015

Cited by 19 publications

(14 citation statements)

References 8 publications

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“…This indicates that from a certain amount of exposure to aging treatment the seeds lose vigor, become more sensitive to stress during germination and subsequently are unable to promote the damages reparation, losing the ability to germinate (Rajjou and Debeaujon, 2008;Samarah and Al-Kofahi, 2008). In studies carried out by Bittencourt and Vieira (2006) and Mendes et al (2010), maize (Zea mays L.) and castor (Ricinus communis L.) seeds germination reduction was observed after accelerated aging, with increasing temperature decay from 42 to 45 °C, in the first case, and from 41 to 45 °C, in the second one. The test completion on Jatropha curcas (common names include Barbados nut, purging nut, physic nut, or JCL (abbreviation of Jatropha curcas Linnaeus)) seeds by Pereira et al (2012) has provided layering of the lots only at the temperature of 41 °C, being considered limiting the temperatures of 42 and 45 °C, while for wheat (Triticum aestivum L.) seeds the temperature of 45 °C was lethal (Maia et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

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Accelerated aging test in niger seeds

2015

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-Niger is a promising oilseed species for biodiesel production but there is no much information about the physiological potential of its seeds. Thus, the aim was to adapt the methodologies of accelerated aging test on six lots of niger seeds. The test was carried out by traditional and with saturated salt solution (20 and 40 g NaCl.100 mL -1 ) methods at 41 and 45 °C for 24, 48, 72 and 96 hours. After the decay period, the seeds were submitted to the germination test, proceeding to an evaluation on the seventh day after sowing, counting the normal seedlings percentage. A completely randomized design with four replications of 50 seeds was used and the means were compared by Tukey's test. The accelerated aging test was correlated with seedling emergence and provided lots classification in at least two levels of vigor. For the accelerated aging test, the method with 20 g NaCl.100 mL -1 at 41 °C for 24 hours is recommend. The traditional method is not suitable because it provides water content variation between samples above what is tolerable.Index terms: biodiesel, Guizotia abyssinica (L.f.) Cass., oilseed, vigor.Teste de envelhecimento acelerado em sementes de nigerRESuMo -o niger é uma espécie oleaginosa de interesse para a produção de biodiesel com poucas informações sobre o potencial fisiológico de suas sementes. Portanto, objetivou-se adequar as metodologias do teste de envelhecimento acelerado para a avaliação do vigor de seis lotes de sementes de niger. utilizaram-se os métodos tradicional e com solução saturada de sal (20 e 40 g de NaCl.100 mL -1), nas temperaturas de 41 e 45 °C por 24, 48, 72 e 96 horas. Após o período de deterioração, as sementes foram submetidas ao teste de germinação e procedeu-se a avaliação, aos sete dias após a semeadura, contabilizandose a porcentagem de plântulas normais. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repetições de 50 sementes e as médias comparadas pelo teste de Tukey. o teste de envelhecimento acelerado correlacionouse com o teste de emergência de plântulas e proporcionou a estratificação dos lotes em pelo menos dois níveis de vigor, recomendando-se o método com 20 g NaCl.100 mL -1 a 41 °C por 24 horas. o método tradicional não é recomendado por proporcionar variação do teor de água entre as amostras, superior ao tolerável.Termos para indexação: biodiesel, Guizotia abyssinica (L.f.) Cass., oleaginosa, vigor.

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Section: Resultsmentioning

confidence: 99%

“…With this procedure, there is reduction of the medium relative humidity, ensuring that the effects of decay should be due to temperature and exposure period (Moncaleano-Escandon et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Accelerated aging test in niger seeds

2015

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“…Quando as sementes foram envelhecidas a 41 ºC/72h, o lote 1 apresentou desempenho superior, sementes dos lotes 4 e 5 apresentaram resultados intermediários, e os lotes 2 e 3 apresentaram sementes de pior qualidade. Mendes et al (2010) Conforme Mendes et al (2010), as temperaturas de 41 ou 42 ºC, por períodos de tempo variando entre 48 e 72 horas são as condições mais indicadas para a condução do teste de envelhecimento acelerado, para diversas espécies.…”

Section: Resultsunclassified

Teste de envelhecimento acelerado em sementes de crambe (Crambe abyssinica Hochst), cultivar FMS Brilhante

et al. 2014

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Accelerated aging test in seeds of crambe (Crambe abyssinica Hochst), cultivar FMS BrilhanteThe use of high physiological quality seeds is essential in the establishment of any crop. Germination and vigor tests are required for seed quality control. The objective of this study was to evaluate the efficiency of the accelerated aging test in determining the vigor of crambe seeds. The initial quality of five lots of crambe seeds, cultivar FMS Brilhante, was assessed by determining the water content, germination, germination first count, seedling emergence index and emergence rate. For the accelerated aging test, the seeds were subjected to temperatures of 41 and 43 °C in a BOD chamber for 48, 72 and 96 hours. At the end of each aging period, the seeds were put to germinate according to the methodology for the germination test. The experiment was arranged in a completely randomized design with four replications per lot. The accelerated aging test under the condition of 41 °C for 72 h provided the greatest vigor discrimination between the lots of crambe seeds, cultivar FMS Brilhante. Key words:Crambe abyssinica Hochst, oilseed, physiological quality, force.

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“…This temperature was also the most restrictive for H. undatus seeds as inferred from to the SGI and MGT variables (Figures 2 and 3). Similarly, Mendes et al (2010) observed that temperature of 45 °C and the periods of 48, 72, and 96 h were damaging to the Ricinus communis L. seeds, accelerating their deterioration. According to Marcos Filho (1999), the increase in temperature is one of the factors contributing to accelerated seed deterioration, according to the basic principles of the accelerated aging test.…”

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Tests for evaluating the physiological quality of pitaya seeds

Ortiz¹,

Moritz²,

Takahashi³

et al. 2015

Sem. Ci. Agr.

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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. Key words: Accelerated aging, cactaceae, electrical conductivity, germination, Hylocereus undatus, vigor ResumoO teste de germinação é utilizado na avaliação da qualidade fisiológica de sementes; porém, devido à sua condução em condições ideais, não tem se mostrado suficiente para este propósito. Nesse sentido, há a possibilidade de recorrer aos testes de vigor, conquanto, a ausência de metodologias padronizadas tem dificultado a sua aplicabilidade e reprodutibilidade. Assim, o trabalho teve como objetivo determinar as metodologias dos testes de germinação, envelhecimento acelerado e condutividade elétrica, a fim de avaliar a qualidade fisiológica de sementes de pitaia. Para o estudo foram utilizadas sementes de frutos maduros de Hylocereus undatus. O delineamento experimental foi o inteiramente casualizado, com quatro repetições. A qualidade fisiológica das sementes foi avaliada pelos testes de germinação, envelhecimento acelerado e condutividade elétrica, além da determinação do índice de velocidade de germinação (IVG) e do tempo médio de germinação (TMG), ambos, em conjunto

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Testes de vigor para avaliação do potencial fisiológico de sementes de mamona (Ricinus communis L.)

Cited by 19 publications

References 8 publications

Accelerated aging test in niger seeds

Accelerated aging test in niger seeds

Teste de envelhecimento acelerado em sementes de crambe (Crambe abyssinica Hochst), cultivar FMS Brilhante

Tests for evaluating the physiological quality of pitaya seeds

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