Soil properties that impact yeast and actinomycete numbers in sandy low nutrient soils

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Abstract:

To explore the beneficial qualities or detrimental consequences of cultureable soil yeasts, it is important to understand which physicochemical soil properties most impact populations of these unicellular fungi in their natural habitat. The goal of this study was to determine which soil properties dictate yeast numbers in pristine sandy, low nutrient soils within a semi-arid region. A correlation matrix of the data obtained for 19 different environmental variables indicated a negative correlation between soil pH and yeast numbers. Using general regression models, it was demonstrated that soil pH and copper concentration were the 2 variables that correlated best with soil yeast counts in these soils. However, soil moisture content was found to be the environmental factor with the most impact on cultureable actinomycetes and heterotrophic microbes. The study also demonstrated that divalent cation availability might impact the size of both yeast and prokaryote populations in these soils.

Afin d’explorer le bénéfice ou les conséquences néfastes des levures cultivables du sol, il est important de connaître quelles sont les propriétés physico-chimiques du sol qui ont le plus d’impact sur ces champignons unicellulaires dans leur habitat naturel. Le but de cette étude était de déterminer quelles propriétés du sol dictent le nombre de levures présentes dans des sols de sable pur à faible contenu en nutriments, dans une région semi-aride. Une matrice de corrélation des résultats obtenus pour 19 variables environnementales a indiqué qu’une corrélation négative existait entre le pH du sol et le nombre de levures. Des modèles de régression généraux ont permis de démontrer que le pH du sol et la concentration de cuivre étaient les 2 variables qui corrélaient le mieux avec le décompte en levures de ces sols. Cependant, l’humidité du sol s’est révélée le facteur environnemental ayant le plus d’impact sur les actinomycètes cultivables et les microbes hétérotrophes. Cette étude a aussi démontré que la disponibilité en cations divalents pouvait avoir un impact sur la taille des populations de levures et de procaryotes dans ces sols.

Document Type: Research Article

Publication date: December 1, 2007

More about this publication?
  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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