MICROBIAL COUNTS of DARK RED LATOSOL SAMPLES STORED AT DIFFERENT TEMPERATURES
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Data
1998-09-01
Autores
Vieira, Francisco Cleber Sousa
Nahas, Ely [UNESP]
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Editor
Sociedade Brasileira de Microbiologia
Resumo
Amostras de solo de um latossolo roxo foram armazenadas à temperatura de 5oC e -12oC, pelo período de 0-32 semanas, com o propósito de se avaliar a influência desses sistemas de conservação nas contagens de diferentes grupos de bactérias e fungos. O número de unidades formadoras de colônias (UFC) nos diferentes períodos de armazenagem foi comparado com o número de colônias obtido logo após a retirada das amostras do solo (tempo zero). O número de bactérias totais e de actinomicetos permaneceu praticamente invariável durante o período de armazenagem das amostras de solo. O número de bactérias Gram-negativas diminuiu em relação ao controle em até 69% enquanto o de Bacillus spp aumentou de 1,9 a 4,9 vezes, assim como o de fungos, a partir da 12a semana nas amostras armazenadas à temperatura de 5oC. Excetuando as variações observadas nas contagens de fungos, os demais grupos de bactérias mostraram, praticamente, a mesma tendência de variação no número de colônias nas amostras de solo armazenadas à temperatura de 5oC e -12oC.
The number of colony forming units (CFU) of different groups of bacteria and fungi in samples stored at temperatures of 5 to -12oC for 0-32 weeks was evaluated. The number of CFU obtained after the different periods of storage of red latossol soil was compared with the number of colonies obtained immediately after removal of soil samples (time zero). The number of total bacteria and actinomycetes in the samples remained practically unchanged throughout the storage period. The number of Gram-negative bacteria decreased by as much as 69% compared to control, while the number of Bacillus spp and of fungi increased 1.9 to 4.9 times starting from the 12th week in samples stored at 5oC. Except for the variations observed in fungal counts, the remaining groups of bacteria practically showed the same variation in number of colonies in soil samples stored at 5oC and -12oC.
The number of colony forming units (CFU) of different groups of bacteria and fungi in samples stored at temperatures of 5 to -12oC for 0-32 weeks was evaluated. The number of CFU obtained after the different periods of storage of red latossol soil was compared with the number of colonies obtained immediately after removal of soil samples (time zero). The number of total bacteria and actinomycetes in the samples remained practically unchanged throughout the storage period. The number of Gram-negative bacteria decreased by as much as 69% compared to control, while the number of Bacillus spp and of fungi increased 1.9 to 4.9 times starting from the 12th week in samples stored at 5oC. Except for the variations observed in fungal counts, the remaining groups of bacteria practically showed the same variation in number of colonies in soil samples stored at 5oC and -12oC.
Descrição
Palavras-chave
bactérias, fungos, fosfatase, armazenagem de solo, bacteria, fungi, phosphatase, soil storage
Como citar
Revista de Microbiologia. Sociedade Brasileira de Microbiologia, v. 29, n. 3, p. -, 1998.