title: Glycine betaine improves oxidative stress tolerance and biocontrol efficacy of the antagonistic yeast Cystofilobasidium infirmominiatum.
abstract: The effect of H₂O₂-induced oxidative stress on the viability of the yeast antagonist, Cystofilobasidium infirmominiatum, as well as the effect of exogenous glycine betaine (GB) on yeast viability under oxidative stress, was determined. GB treatment improved the tolerance of C. infirmominiatum to oxidative stress. Compared to untreated control yeast cells, GB-treated cells showed less accumulation of reactive oxygen species (ROS) and a lower level of protein oxidation in response to oxidative stress. Additionally, GB-treated yeast exhibited greater biocontrol activity against Penicillium expansum and a faster growth in wounds of apple fruits stored at 25 °C compared to the performance of untreated yeast. The activities of antioxidant enzymes, including catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPX) of C. infirmominiatum were elevated by GB treatment. Results indicate that the elicitation of antioxidant response by GB may contribute to improvements in oxidative stress tolerance, population growth in apple wounds, and biocontrol activity of C. infirmominiatum.
authors.affiliation: U.S. Department of Agriculture-Agricultural Research Service, WV, USA.
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Michael
authors.initials: M
authors.lastname: Wisniewski
authors.forename: Samir
authors.initials: S
authors.lastname: Droby
authors.forename: Silvana
authors.initials: S
authors.lastname: Vero
authors.forename: Shiping
authors.initials: S
authors.lastname: Tian
authors.forename: Vera
authors.initials: V
authors.lastname: Hershkovitz
mesh_terms: D000898:Antibiosis; D000975:Antioxidants / Q000378:metabolism; D001487:Basidiomycota / Q000187:drug effects* / Q000254:growth & development; D001622:Betaine / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D005638:Fruit / Q000382:microbiology; D005979:Glutathione Peroxidase / Q000378:metabolism; D027845:Malus / Q000382:microbiology; D050296:Microbial Viability; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D010407:Penicillium / Q000254:growth & development*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species; D001622:Betaine; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase