Evaluation of yeasts from Tibetan fermented products as agents for biocontrol of blue mold of Nashi pear fruits

摘要: A total of 20 strains yeast isolated from Tibetan fermented products were screened for antagonism against blue mold pear caused by Penicillium expansum. Six isolates that inhibited incidence postharvest decay 35% or more selected further screening. Among them, the most effective was Rhodotorula mucilaginosa. The results showed washed cell suspensions R. mucilaginosa yielded better antagonistic efficacy than unwashed cell-culture mixtures, cell-free culture filtrates, and autoclaved cultures. Biocontrol activity improved with increasing concentrations incubated cells. best concentration 1×108 cells/ml, at which only 16.7% after 6 d incubation. germination conidia P. expansum in vitro significantly both cell-suspensions mixtures. Rapid colonization different a relationship between yeast-cell biocontrol activity. Although titratable acidity fruits increased treatment, did not affect soluble solids ascorbic acid content. This is first study to report Tibet Autonomous Region China may have potential as an antagonist control fruits.