Etiology of fruit bronzing, a new disease affecting jackfruit caused by Pantoea stewartii (Smith) Mergaert et al.
2012
Gapasin, R.M. | Garcia, R.P. | Dela Cruz, C.S. | Borines, L.M.
Jackfruit bronzing, an unreported disease affecting jackfruit is characterized by yellowish-orange to reddish discoloration of the affected pulps and rags in the fruit. The etiology of this disease, particularly its isolation, pathogenicity, characterization and identification is the scope of this study. The pathogen was isolated from an infected jackfruit, the pathogenicity was conducted to detached and attached fruits and pathogen was characterized and identified based on its cultural and morphological characteristics, staining reactions, physiological and biochemical characteristics, inoculations to other plants as well as DNA analysis using the polymerase chain reaction (PCR). The bacterium produces yellow pigment in culture, gram negative, slightly pleomorphic non-motile, facultatively anaerobic short-rods, measuring 1-2 um in length, catalase positive, hydrolyze gelatin and starch but not tween 80, does not produce hypersensitivity to tobacco, cause depressed lesions or pits on potato discs and infects corn producing the same symptom as bacterial wilt or Stewart's disease. DNA analysis through the polymerase chain reaction confirmed the cause of jackfruit, bronzing as Pantoea stewartii or Pantoea stewartii subsp. stewartii (Smith) Mergaert et. al., (formerly Erwinia stewartii) (Smith) Dye, (the same bacterium that causes bacterial wilt or Stewart's disease of corn).
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