Cross Response of Slow Filters to Dual Pathogen Inoculation in ClosedHydroponic Growing Systems

K. Bergstrand, S. Khalil, M. Hultberg, B. Alsanius
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引用次数: 3

Abstract

The efficacy of slow filters for horticultural purposes is suggested to be the result of multiple factors. Physical and biological properties of the filter column and the nutrient solution are likely to influence on filter performance. It has previously been shown that enzyme activity on the filter skin is a main parameter which will explain roughly 50% of filter efficacy. Since enzyme activity is enhanced by the addition of fungal cell walls to the filter skin, presence of a fungal root pathogen might affect enzyme activity and filter efficacy. In this study, slow filters integrated into closed NFT systems with a tomato crop were inoculated with mycelia from Pythium aphanidermatum. Enzyme activity, microbial colonisation, polysaccharide content and DNA content of the filter skin as well as microbial flora and total organic carbon in the nutrient solution were monitored. Tests of filter efficacy against Fusarium oxysporum f.sp. cyclaminis showed no significant influence on filter efficacy by the addition of P. aphanidermatum. Enzyme activities in the filter skin were not affected by the addition of P. aphanidermatum. A negative correlation was found between biofilm polysaccharide content and activity of xylanase activity on the filter skin. Filter efficacy was high (>99.9%) throughout the study. No damage to the crop as effect of pathogenic fungi was seen. We concluded that abundance of an oomycete pathogen in a closed hydroponic system does not affect filter efficacy, and that the filter skin microflora function, but not composition, is affected by this pathogen.
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封闭水培系统中缓慢过滤器对双重病原菌接种的交叉响应
园艺用途的慢速过滤器的功效被认为是多种因素的结果。过滤柱和营养液的物理和生物特性可能会影响过滤性能。先前的研究表明,过滤器表面的酶活性是一个主要参数,它可以解释大约50%的过滤器功效。由于酶活性通过在滤皮上添加真菌细胞壁而增强,因此真菌根病原体的存在可能会影响酶活性和过滤效果。在本研究中,采用封闭NFT系统与番茄作物相结合的缓慢过滤器,接种了蛇皮霉菌丝体。监测滤皮酶活性、微生物定植、多糖含量和DNA含量以及营养液中微生物菌群和总有机碳。对尖孢镰刀菌的过滤效果试验。添加假单胞菌对假单胞菌的过滤效果无显著影响。滤皮酶活性不受添加假单胞菌的影响。生物膜多糖含量与滤皮上木聚糖酶活性呈负相关。在整个研究过程中,过滤效率很高(>99.9%)。由于病原菌的作用,未见对作物造成损害。我们得出结论,封闭水培系统中卵菌病原体的丰度不影响过滤器的功效,并且过滤器皮肤微生物群的功能而不是组成受该病原体的影响。
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