Factors involved in the suppression of Fusarium oxysporum f. sp. lycopersici by soil reduction
2005
Momma, N.(Chiba Univ. (Japan)) | Usami, T. | Amemiya, Y. | Shishido, M.
Effect of soil reduced conditions the survival of Fusarium oxysporum f. sp. Lycopersici (Fol) was studied. The number of conidia and chlamydospores of Fol decreased significantly by soil amendment with wheat bran followed by flooding and covering of the soil surface with a transparent plastic film (wheat bran - amended solarization). However, steam pasteurization of the soil cancelled this disinfestation effect by maintaining the population of the pathogen propagules, suggesting that biotic factors indigenous to the soil contributed to the effect The changes in Eh FDA hydrolysis and microflora of the soil subjected to wheat bran-amended solarization suggested that the soil bacterial communities, especially facultative anaerobes, negatively influenced the survival of the pathogen propagules. On the other hand, some unique bands were revealed by the PCR-DGGE technique applied to the soil subjected to wheat bran-amended solarization, implying that a shift of the bacterial community structure or increase in the number of some dominant bacterial groups may specifically contributed to the decrease of the number of pathogen propagules.
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