Sources of resistance to Xanthomonas campestris pv. musacearum , the causal agent of banana Xanthomonas wilt

It is claimed that with the exception of Musa balbisiana , all banana varieties are susceptible to bacterial wilt caused by Xanthomonas campestris pv. musacearum (Xcm). Despite being resistant to Xcm infection, M. balbisiana is not preferred for breeding since it belongs to the BB subgroup, while most edible bananas are of the A genome. To identify potential sources of resistance to Xcm, we evaluated 72 banana accessions representing the Musa genetic diversity, in an outdoor confined potted trial. The midribs of the youngest leaf of three-month-old banana plants were inoculated with 1x10 8 CFU/ml of Xcm isolate USY13P , and symptom development assessed weekly for four months. Results confirmed that M. balbisiana genotypes are indeed resistant to Xcm. We further identified varieties within the M. acuminata subsp . zebrina (AA) set as potential useful sources of Xcm resistance. These findings reveal the potential to develop banana and plantain varieties with tolerance to Xcm.

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