The Influence of Exogenous Nutrients on the Abundance of Yeasts on the Phylloplane of Turfgrass |
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Authors: | Shannon Nix-Stohr Leon L Burpee James W Buck |
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Institution: | (1) Department of Plant Pathology, University of Georgia, Griffin, GA 30223-1797, USA |
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Abstract: | Four experiments were conducted to assess the effect of foliar applications of various nutrient solutions on the phylloplane
yeast community of tall fescue (Festuca arundinacea Schreb.). In the first three experiments, increasing concentrations of sucrose (2–16%), yeast extract (0.5–2.5%), and sucrose
plus yeast extract (2.5–18.5% total) were applied and the yeast colony forming units (cfu) enumerated 14 h later by dilution
plating. Significant positive linear relationships were observed between the number of yeast cfu and applications of both
yeast extract and sucrose plus yeast extract. Foliar applications of sucrose alone had no significant effect on yeast community
abundance, indicating that phylloplane yeasts of turfgrass are not limited by the amount or availability of carbohydrates.
In the fourth experiment, five different solutions were applied to tall fescue to investigate the response of the yeast community
to organic and inorganic nitrogen sources. Tryptone or yeast extract, both with considerable amino acid composition, significantly
increased the yeast population, while yeast nitrogen base (with or without amino acids) and ammonium sulfate had no affect
on yeast abundance. These results suggest that organic nitrogen stimulate yeast community growth and development on the phylloplane
of tall fescue, while carbohydrates, inorganic nitrogen, and non-nitrogenous nutrients have little positive effect. |
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