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Characterization and identification of soft rot bacterial pathogens of different fruits in Bangladesh

By: Raihan Mujib Himel, Abu Ashraf Khan, Abdul Mannan Akanda, Meftahul Karim

Key Words: Soft rot, Fruit, Bacterial isolate, Potato soft-rot test, Oxidative fermentative (OF) test.

Int. J. Biosci. 9(1), 1-9, July 2016.



The aim of the study was to characterize and identify the soft rot bacterial pathogens of different fruits in Bangladesh. Soft rotted fruit samples of mango, apple, banana, papaya and pineapple were collected from different areas of Bangladesh based on characteristic soft rot symptoms. From these samples, 50 isolates were isolated. Among the 50 isolates, only 17 isolates showed positive result in potato soft rot test. Among 17 potato soft rot positive bacterial isolates, 10 isolates were found as oxidative fermentative test (OF) positive. Biochemical and physiological tests were performed for characterization of 10 ‘OF’ positive and 07 OF negative bacterial isolates. Eight ‘OF’ positive isolates namely Mango 01, Mango 10, Mango 13, Mango 16, Apple 03, Banana 01, Pineapple 01 and Papaya 01 were identified as Erwinia carotovora subsp. carotovora. Remaining two ‘OF’ positive isolates namely Mango 11 and Mango 12 were identified as Dickeya dadantii (formerly Erwinia chrysanthemi). The 07 ‘OF’ negative bacterial isolates, namely Mango 02, Mango 03, Mango 05, Mango 08, Apple 01, Apple 02 and Pineapple 02 were identified as Pseudomonas marginalis.


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