Abstract:
:The effect of high temperature and oxidative stress on the cell viability of the yeast antagonist, Metschnikowia fructicola was determined. A mild heat shock (HS) pretreatment (30 min at 40 °C) improved the tolerance of M. fructicola to subsequent high temperature (45 °C, 20-30 min) and oxidative stress (0.4 mol L⁻¹ hydrogen peroxide, 20-60 min). HS-treated yeast cells showed less accumulation of reactive oxygen species (ROS) than nontreated cells in response to both stresses. Additionally, HS-treated yeast exhibited significantly greater (P<0.0001) biocontrol activity against Penicillium expansum and a significantly faster (P<0.0001) growth rate in wounds of apple fruits stored at 25 °C compared with the performance of untreated yeast cells. Transcription of a trehalose-6-phosphate synthase gene (TPS1) was upregulated in response to HS and trehalose content also increased. Results indicate that the higher levels of trehalose induced by the HS may contribute to an improvement in ROS scavenging, stress tolerance, population growth in apple wounds and biocontrol activity of M. fructicola.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Liu J,Wisniewski M,Droby S,Tian S,Hershkovitz V,Tworkoski Tdoi
10.1111/j.1574-6941.2010.01037.xsubject
Has Abstractpub_date
2011-04-01 00:00:00pages
145-55issue
1eissn
0168-6496issn
1574-6941journal_volume
76pub_type
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