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A Box-Behnken Design For Predicting The Combined Effects Of Relative Humidity And Temperature On Antagonistic Yeast Population Density At The Surface Of Apples

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  • Life Sciences :: Phytobiology (Plant Sciences
  • Forestry
  • Mycology...) [F12]
  • Sciences Du Vivant :: Biologie Végétale (Sciences Végétales
  • Sylviculture
  • Mycologie...) [F12]
  • Biology
  • Design
  • Ecology
  • Geography
  • Medicine


doi:10.1016/j.ijfoodmicro.2007.11.053 in ag ce M © 2007 Elsevier B.V. All rights reserved. is achievable by postharvest application of antagonists and by preharvest spraying of biocontrol agents in the field (Benbow The fluctuation of abiotic factors such as temperature, water availability, relative humidity and UV radiation has the greatest impact on the growth and biological proprieties of prospective biocontrol agents (Magan, 2001; Teixidõ et al., 1999). Available online at biol and Sugar 1999; Korsten et al., 1997; Leibinger et al., 1997; Teixidõ et al., 1998a). In the latter practice, the antagonist is Keywords: Population density; Pichia anomala strain K; Candida oleophila strain O; Relative humidity; Temperature and Box-Behnken design 1. Introduction Biological control of postharvest diseases of fruits appears as a realistic alternative to fungicide application, as only the fruits need to be treated, environmental factors are defined and stabilized in storage rooms, so that harvested commodities will have high value (Fokkema, 1991; Wilson and Wisniewski, 1994; Jijakli et al., 1999). Biocontrol of postharvest fruit decays applied just before harvest so that it can colonize the fruit surface and any wounds inflicted during harvest before the arrival of wound pathogens (Ippolito and Nigro, 2000). Yet authors highlight the very real practical problem of promoting the effective establishment of prospective antagonists in a natural environment. This can be crucial, limiting the consistency of biocontrol under field conditions and the widespread commercialization of biocontrol agents. Abstract The objective of this work was to develop models predicting the combined effects of relative humidity (RH, 75–98%), temperature (5–25 °C), and initial applied yeast concentration (104–108 CFU/ml) on the apple-surface population densities of two biocontrol agents fused against postharvest diseases; the antagonistic yeasts Pichia anomala strain K and Candida oleo

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