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Screening and identification of epiphytic yeasts with potential for biological control of green mold of citrus fruits

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Abstract

Epiphytic yeasts isolated from the surface of citrus fruits, harvested in several orchards in the Souss-Massa-Drâa Valley, Agadir, Morocco, were in vivo screened for antagonistic activity against Penicillium digitatum, the causal agent of green mold of citrus. From a total of 245 yeast strains assessed for their biocontrol activity against P. digitatum, fifteen reduced the incidence of disease to less than 50%. The effectiveness of the best selected yeast strains showed that Pichia anomala (YT73), Debaryomyces hansenii (YT22) and Hanseniaspora guilliermondii (YT13) were the most effective, with a reduction of green mold incidence from 65 to ~80%, compared to the control. The identification of the fifteen selected yeast strains was carried out through an integrated approach including phenotypic and genotypic (sequencing of D1/D2 domain of 26S rDNA encoding gene) methods. These 15 selected were identified as: H. guilliermondii, D. hansenii, H. uvarum and P. anomala. The study of the dynamics of two of the best strains, H. guilliermondii and D. hansenii, showed that these strains can grow rapidly, by approximately 2 log units, in citrus fruit wounds. Such rapid growth in wounds indicates that these antagonist yeasts are excellent colonizers of citrus wounds and can thrive on citrus fruits as a substrate.

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Correspondence to Hassan Boubaker.

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Taqarort, N., Echairi, A., Chaussod, R. et al. Screening and identification of epiphytic yeasts with potential for biological control of green mold of citrus fruits. World J Microbiol Biotechnol 24, 3031–3038 (2008). https://doi.org/10.1007/s11274-008-9849-5

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Keywords

  • Antagonistic yeast
  • Biological control
  • Citrus fruits
  • Penicillium digitatum
  • Postharvest