Common Foodborne Yeast Genera

Question 1

+ Ascospores; multilateral budding
+ Cell round, oval, or elongated
+ Strain spoils tomato sauce, mayo, salad dressing, wine, ciders, etc.

Answer 1

Saccharomyces

Question 2

+ Ascospores
+ Divide by lateral fission
+ Likes acid conditions
+ Can spoil honey

Answer 2

Schizosaccharomyces

Question 3

+ Ascospores
+ Multilateral budding
+ Osmophilic

Answer 3

Zygosaccharomyces

Question 4

+ Ascospores shaped like derby hats
+ Film or pellicle in beer and wine
+ Spoils alcoholic liquor, sauerkraut, pickles

Answer 4

Pichia

Question 5

+ Growth in 24% NaCl: at Aw of 0.65
+ Common in dairy products
+ Spoilage of cheese, yogurt, pickles, wines, cured meats, orange juice concentrate

Answer 5

Debaromyces

Question 6

+ Ascospores and pseudomycelium
+ Pellicle on surface of liquid
+ Spoilage of ground beef, poultry, cured meats

Answer 6

Candida

Question 7

+ Multilateral bedding
+ Non-fermenters
+ Many are psychrotrophic
+ Found on fresh beef, poultry, shrimp, fish

Answer 7

Rhodotorula

Question 8

+ Multilateral budding
+ Pseudomucelium
+ Strain can ferment lactose; can spoil milk
+ Can spoil fruit concentrates and acidic foods

Answer 8

Torulopsis

Question 9

+ Apiculate (pear shaped)
+ Bipolar budding
+ Fermentative and oxidative
+ Spoilage of wines, fruit, and fruit juices

Answer 9

Kloeckera

Question 10

+ Budding and arthrospores
+ Sugar fermentation weak or absent
+ True mycelium formed
+ Psychrotropic
+ Found on refrigerated beef, poultry, frozen lamb, and other refrigerated foods

Answer 10

Trichosporon