Type of Document	Master's Thesis
Author	Kamath, Osler C.
URN	etd-03122009-040821
Title	Physiology and control of apple scald
Degree	Master of Science
Department	Horticulture
Advisory Committee	Advisor Name Title Kushad, Mosbah M. Committee Chair Barden, John A. Committee Member Orcutt, David M. Committee Member
Keywords	Apple-scald
Date of Defense	1990-02-05
Availability	restricted
Abstract The effect of controlled atmosphere (CA) storage, and antioxidant treatment on polyphenoloxidase (EC 1. 1418.1:PPO), peroxidase (EC11.11.1.7:POD), and superoxide dismutase (EC 1.15.1.1:S0D) activities and superficial scald and soft scald development in 'Virginiagold','Stayman', and 'Rome' apples (Malus domestica Borkh.) was investigated. 'Virginiagold' apples treated postharvest with an aqueous solution of diphenylamine (DPA) + 1,2, dihydro -6- ethoxy -2,2,4-trimethylquinoline (ethoxyquin) and stored in CA exhibited lower soft scald incidence and higher firmness than comparable fruits stored at O°C in air storage. Fruit firmness and titratable acids (TA) decreased continuously, while ethylene increased in storage. Titratable acids and firmness were positively correlated, while TA and ethylene and firmness and ethylene were negatively correlated. 'Stayman' and 'Rome' apples analyzed during storage showed increase in levels of α-famesene and its oxidation products conjugated trienes. During storage fruits showed an increase in the activities of polyphenoloxidase (PPO), peroxidase (POD), and superoxide dismutase (SOD), which reached a maximum when scald symptoms in 'Stayman' were observed. Our results indicate that 'Stayman' apples exhibited scald and 'Rome' did not, because 'Stayman' apples had a ten fold higher PPO activity than 'Rome.'
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access  LD5655.V855_1990.K353.pdf 1.86 Mb 00:08:37 00:04:26 00:03:53 00:01:56 00:00:09 next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

If you have questions or technical problems, please Contact DLA.