qualidade de sementes de tomate influenciada pelos tratamentos térmico e osmótico tomato seeds quality affected by dry heat and osmotic treatments
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2004
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Abstract
O tratamento térmico via calor seco, visando o controle de patógenos associado às sementes, pode causar danos à qualidade fisiológica das mesmas, que podem ser recuperados, por meio do condicionamento osmótico. Avaliou-se o efeito do tratamento térmico via calor seco na qualidade sanitária e fisiológica das sementes de tomate, assim como a influência do condicionamento osmótico na qualidade fisiológica das sementes submetidas à termoterapia. As sementes das cultivares Quadrado Mix, Topmec e Calmec VFN foram expostas ao tratamento térmico a 70; 72,5 e 75ºC, em estufa com circulação forçada, por períodos de zero, 48; 96 e 120 horas. O período zero, sem a aplicação de calor, foi considerado como testemunha. Posteriormente, estas sementes foram avaliadas quanto à sanidade, condicionadas em solução aerada de polietilenoglicol a 0,0 e -1,0 MPa e submetidas à avaliação do teor de água, da germinação e do vigor. Pelos resultados pode-se concluir que o tratamento térmico via calor seco não foi eficiente em eliminar os patógenos associados às sementes de tomate, dependendo da cultivar avaliada. Períodos prolongados de exposição ao calor seco causaram danos à qualidade fisiológica das sementes de tomate, que não foram recuperados com o subseqüente condicionamento osmótico.
The dry heat treatment aiming to control microorganisms in the seeds can cause damage to the physiological quality of seeds. Osmotic conditioning can be useful tool for recovering the physiological quality of the heat treated seeds. The study was carried out to evaluate the effects of dry heat treatments on the tomato seeds sanitary and physiologic quality, as well as to analyze the effect of the osmotic conditioning on seeds submitted to dry heat treatment. The seeds of cultivars Quadrado Mix, Topmec and Calmec VFN were heated at 70; 72.5 and 75ºC by periods of zero, 48; 96 and 120 hours. After the heat treatment, the seeds were evaluated for the presence of pathogens and were submitted to the osmotic conditioning using polyethylenoglicol in the 0.0 and -1.0 MPa osmotic potentials. Seed moisture content, germination test and vigor tests were performed. The dry heat treatment did not eliminate the microorganisms in the tomato seeds, depending on variety evaluted. The prolonged periods of dry heat treatments caused severe seed damage and the osmotic conditioning treatment was not able to improve the seed quality.
The dry heat treatment aiming to control microorganisms in the seeds can cause damage to the physiological quality of seeds. Osmotic conditioning can be useful tool for recovering the physiological quality of the heat treated seeds. The study was carried out to evaluate the effects of dry heat treatments on the tomato seeds sanitary and physiologic quality, as well as to analyze the effect of the osmotic conditioning on seeds submitted to dry heat treatment. The seeds of cultivars Quadrado Mix, Topmec and Calmec VFN were heated at 70; 72.5 and 75ºC by periods of zero, 48; 96 and 120 hours. After the heat treatment, the seeds were evaluated for the presence of pathogens and were submitted to the osmotic conditioning using polyethylenoglicol in the 0.0 and -1.0 MPa osmotic potentials. Seed moisture content, germination test and vigor tests were performed. The dry heat treatment did not eliminate the microorganisms in the tomato seeds, depending on variety evaluted. The prolonged periods of dry heat treatments caused severe seed damage and the osmotic conditioning treatment was not able to improve the seed quality.
| Reference Key |
lopes2004horticulturaqualidade
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| Authors | ;Flávio de Souza Lopes;Cláudia Antonia Vieira Rossetto |
| Journal | research on biomedical engineering |
| Year | 2004 |
| DOI |
10.1590/S0102-05362004000300029
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