Pathogenic Variability of the Jackfruit-Bronzing Bacterium Pantoea stewartii Subspecies stewartii Infection to Jackfruit Varieties and Its Pivotal Plant Hosts in Malaysia

Infection with Pantoea stewartii subspecies stewartii, which causes jackfruit-bronzing disease, is a huge problem faced by the jackfruit industry in Malaysia. This study was carried out to assess disease ratings and aggressiveness performance of 28 isolated from diseased jackfruits four collection areas (Jenderam Selangor State, Maran Muadzam Shah Pahang Ipoh Perak State) Peninsular Malaysia, inoculated into varieties (Tekam Yellow J33, Hong J34 Subang Chap Boy J39), sweetcorn variety, Mas Madu (two-week-old seedlings nine-week-old seedlings), cucumber Rocky, pineapple MD2. The results revealed that produced symptoms upon all inoculations pathogenicity testing, thus fulfilling Koch’s postulates, except case J39 seedlings). No (disease rating 0) were observed seedlings) within 14 days post-inoculation (14 dpi). progression (based on ratings) proved variety most resistant, whereas J33 susceptible disease. 14-dpi period variability among bacterial isolates, where isolate JEN-14 had fastest highest when J34, seedlings, cucumber, pineapple. Likewise, AUDPC value, based rating, across isolates indicated aggressive significant (J33, inoculation; p < 0.05). Even though Jenderam (other than JEN-14) better area under progress curve (AUDPC) values Ipoh, no differences found (p Based our findings, we identified as best potential candidate assist resistance breeding future. Last but not least, methods, ratings, variations profiles this may be beneficial providing disease-rating references appropriate screening approaches selecting appropriately for evaluating defense response program.