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首页> 外文期刊>European Journal of Soil Biology >Molecular and functional characteristics of streptomycete communities in relation to soil factors and potato common scab
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Molecular and functional characteristics of streptomycete communities in relation to soil factors and potato common scab

机译：链霉菌群落的分子和功能特性与土壤因子和马铃薯常见结ab的关系

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Naturally-occurring disease-suppressive soils provide control of plant pathogens via the activities of indigenous microbes. While all soils contain antagonistic microbes, there is little systematic understanding of the correlates of variation in indigenous antagonist populations and on their relationships with plant diseases. We characterized the population densities, inhibitory capacities, and phylogenetic composition of soil streptomycete communities in a potato field over time in relation to edaphic factors, antagonist inoculation, and potato common scab severities. Antagonistic Streptomyces populations were highly variable in time and space. Similarly, metagenomic analyses of streptomycete communities showed extensive spatial and temporal variation in composition. Soil characteristics (pH, potassium, organic matter, nitrate, and phosphorous) sometimes explained up to 50% of the spatial variation in Streptomyces population densities, proportion of inhibitory isolates, or pathogen suppressive capacity among locations in the field. Soil pH was positively correlated with common scab severity, and negatively correlated with the proportion of pathogen-inhibitory Streptomyces among locations in the field. This suggests that high pH may have direct beneficial effects on pathogen populations and disease development, and/or indirect effects on pathogen populations via reductions in pathogen-inhibitory Streptomyces populations. Mean pathogen suppressive capacity of antagonistic Streptomyces was negatively correlated with common scab disease. Streptomyces inoculants had no discernible effect on streptomycete community composition, antagonistic capacities, or potato common scab severities, likely reflecting poor colonization of inoculants. Further understanding of the relationships between indigenous antagonist populations and plant diseases will be important to harnessing the potential of indigenous communities to contribute to sustainable disease management. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：天然存在的抑制疾病的土壤通过土著微生物的活动来控制植物病原体。尽管所有土壤都含有拮抗微生物，但对本土拮抗剂种群变异的相关性及其与植物病害关系的系统了解很少。我们表征了随着时间的流逝，马铃薯田中土壤链霉菌群落的种群密度，抑制能力和系统发育组成与营养因子，拮抗剂接种和马铃薯常见sc病的严重程度有关。拮抗链霉菌种群在时间和空间上高度可变。同样，链霉菌群落的宏基因组学分析显示，其组成在空间和时间上存在很大差异。土壤特征（pH，钾，有机质，硝酸盐和磷）有时可以解释链霉菌种群密度，抑制性分离物的比例或病原体抑制能力之间高达50％的空间变化。土壤pH与常见sc的严重程度呈正相关，与田间病原体抑制链霉菌的比例呈负相关。这表明高pH值可能会对病原体种群和疾病发展产生直接的有益影响，和/或通过减少病原体抑制链霉菌种群而对病原体种群产生间接影响。拮抗链霉菌的平均病原体抑制能力与普通sc疮呈负相关。链霉菌接种物对链霉菌群落组成，拮抗能力或马铃薯常见结ab病严重程度没有明显影响，这可能反映了接种物定植不良。进一步了解土著拮抗种群与植物病害之间的关系对于利用土著社区的潜力为可持续的疾病管理做出贡献至关重要。 （C）2015 Elsevier Masson SAS。版权所有。

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