Comportamento de fungos e de sementes de feijoeiro durante o teste de envelhecimento artificial

Silva, Monalisa Alves Diniz da; Silva, Walter Rodrigues da

doi:10.1590/s0100-204x2000000300016

Cited by 13 publications

(10 citation statements)

References 7 publications

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“…Seed vigor of seeds harvested with 40 and 45% moisture content was similar throughout the storage period, whereas for seeds harvested with 35% moisture content, seed vigor reduced sharply in the same period. Silva and Silva (2000) have found that the accelerated aging conditions favor the development of some microorganisms, thus reducing their potential. Overall, untreated seeds resisted to the stress of the cold test better than treated seeds, throughout the storage period ( Figure 5).…”

Section: Resultsmentioning

confidence: 99%

Quality of maize seeds harvested and husked at high moisture levels

et al. 2013

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Harvest of maize seeds with high moisture levels has been recommended; nevertheless, after harvest, the ears undergo the process of husking and there is a need to assess the compatibility of these processes. The purpose of this study was to assess the effects of mechanical husking on the quality of maize seeds collected at high moisture levels. Dent BM 3061 hybrid maize seeds, manually collected from the ear, with moisture contents of 45%, 40% and 35%, and a 20/64 round sieve were used. The ears were mechanically husked (CWA machine, 312 rpm), dried in a stationary drier at 35 ⁰C until reaching 22% moisture, followed by drying at 42 ºC until reaching 12%. Then, they underwent shelling, followed by a chemical treatment with Maxin® + K-obiol® + Actellic®. Seed quality was assessed according to the occurrence tests of mechanical damage, first count, germination, seedling emergence, emergence speed index, average emergence time, electrical conductivity, accelerated aging, cold test, and seed health test at every quarter for 9 months. The mechanical husking affects maize seed quality, depending on the degree of seed moisture at harvest and on the material studied. This hybrid's seeds can be collected with seed moisture levels at 40% with the use of mechanical husking.

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Section: Resultsmentioning

confidence: 99%

Quality of maize seeds harvested and husked at high moisture levels

et al. 2013

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“…e de Aspergillus spp. (Singh et al, 1991). Os resultados foram expressos em porcentagem de sementes infectadas por fungos.…”

Section: Methodsunclassified

“…Fatores tais como, contaminação inicial das sementes por microorganismos (Silva & Silva, 2000) e absorção de água pelas sementes (Tekrony, 1993) podem interferir na interpretação dos dados do teste de envelhecimento acelerado. Segundo Powell (1995), a germinação após o período de exposição é inversamente pro-porcional ao teor de água.…”

Section: Introductionunclassified

Envelhecimento acelerado e deterioração controlada em sementes de amendoim

Antonia

Rossetto

Lima

et al. 2004

Pesq. agropec. bras.

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Resumo -Pesquisas têm sido desenvolvidas visando determinar os procedimentos para a avaliação de diferenças no potencial fisiológico de lotes de sementes, com destaque aos testes de vigor. O objetivo deste trabalho foi estudar o envelhecimento acelerado e a deterioração controlada para avaliação do vigor de sementes de amendoim (Arachis hypogaea). Accelerated aging and controlled deterioration of peanut seedsAbstract -Researches have been developed aiming to determine the procedures for physiological potential seeds evaluation with emphasis to vigour tests. The objective was to study the controlled deterioration and the accelerated aging in peanut (Arachis hypogaea) seeds vigour. Four lots of peanut seeds were submitted to the ageing accelerated test, at 42 o C or 43ºC, for 48 hours and 72 hours, with or without the use of saturated solution of NaCl, and controlled deterioration test, with 15% and 20% water content, at 40 o C or 45 o C, for 48 hours. The evaluation of water content, germination and health test was accomplished. There was no different performance among the four lots by the germination and emergency tests. In the ageing accelerated test with saturated solution, the period of 72 hours at 42 o C introduces sensibility to evaluate seeds physiological potential. In the controlled deterioration test, the combination of 15% of water content, for 48 hours at 45 o C, is efficient to detect vigor differences among peanut seed lots.

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“…e Chaetomium spp. Silva e Silva (2000) afirmaram que Aspergillus spp. é o principal causador desse baixo desempenho.…”

Section: Introductionunclassified

Envelhecimento acelerado e ocorrência de fungos para avaliação do potencial fisiológico de sementes de arroz

Monteiro¹,

Tunes²,

Pacheco³

et al. 2017

Rev. Ciênc. Agr.

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R E S U M OO teste de envelhecimento acelerado é um dos mais difundidos para a avaliação do vigor das sementes de várias espé-cies cultivadas, sendo capaz de proporcionar informações com alto grau de consistência. No entanto, o desempenho das sementes envelhecidas artificialmente pode ser influenciado, de modo negativo, pela presença de fungos. Diante disso, o presente trabalho teve por objetivo estudar o teste de envelhecimento acelerado em diferentes concentrações salinas para determinar o potencial fisiológico e sanitário de cultivares de arroz. Foram utilizadas sementes de arroz das cultivares Irga 409, Irga 424 e Epagri 144. O teste de envelhecimento acelerado foi conduzido em três etapas: teste tradicional com uso de água; teste com uso de soluçõesde NaCl saturada (SS) e super saturada (SSS) durante os períodos de 24, 48, 72 e 96 horas a 42 °C. Após, foi avaliado o grau de humidade, a germinação e a sanidade das sementes. Os efeitos deletérios do teste de envelhecimento acelerado foram atenuados com o incremento de concentrações salinas. O teste de envelhecimento acelerado em SS às 48 h e em SSS às 48, 72 e 96 h permite classificar as cultivares de arroz em diferentes níveis de vigor. Sementes contaminadas por agentes fúngicos tiveram resposta positiva na germinação com o uso dos métodos com solução salina. Palavras-chave: cloreto de sódio, cultivares, Oryza sativa L., teste de vigor. A B S T R A C TThe accelerated aging test is one of the most widespread for the vigor of the seeds of various cultivated species, being able to provide information with a high degree of consistency. However, the performance of the artificially aged seeds can be influenced negatively by the presence of fungi. Thus, the present work aimed to study the accelerated aging test at different salt concentrations to determine the physiological and health potential of rice cultivars. Were used seeds of rice cultivars Irga 409, Irga 424 and Epagri 144. The accelerated aging test was conducted in three stages: traditional test with water; test using saturated NaCl solution (SS) and supersaturated NaCl solution (SSS), during periods of 24, 48, 72 and 96 hours at 42 °C. After, we evaluated the degree of moisture, germination and seed health. The deleterious effects of accelerated aging test were attenuated with the increase of salt concentrations. The accelerated aging test in saturated solution (SS) for 48 h and super saturated solution (SSS) at 48, 72 and 96 hours allows classifying rice cultivars at different levels of force. Seeds contaminated by fungal agents had a positive response in germination when treated with saline solutions

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Comportamento de fungos e de sementes de feijoeiro durante o teste de envelhecimento artificial

Cited by 13 publications

References 7 publications

Quality of maize seeds harvested and husked at high moisture levels

Quality of maize seeds harvested and husked at high moisture levels

Envelhecimento acelerado e deterioração controlada em sementes de amendoim

Envelhecimento acelerado e ocorrência de fungos para avaliação do potencial fisiológico de sementes de arroz

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