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Evaluation of 20 enset (Ensete ventricosum) landraces for response to Xanthomonas vasicola pv. Musacearum infection

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Abstract

Xanthomonas wilt, caused by Xanthomonas vasicola pv. musacearum (Xvm), formerly X. campestris pv. musacearum, is the most threatening and economically important disease of enset (Ensete ventricosum), the multipurpose food security crop orphan in south and southwestern Ethiopia. Xvm has also had a major impact on banana and plantain production in east Africa following its detection in Uganda in 2001 and subsequent spread. The only current effective control of this disease relies on integrated disease management strategies including minimizing field pathogen inoculum and deployment of wilt-resistant enset landraces. Identifying landraces with stable and durable Xvm resistance will greatly accelerate breeding programmes. While previous reports have identified landraces with varying degrees of tolerance to Xvm, no systematic study has collectively assessed their relative resistance. Here we undertook a detailed “common garden” analysis of 20 enset landraces previously reported to exhibit lower susceptibility to Xvm using an aggressive Xvm inoculum isolated from a disease hotspot area. Detailed longitudinal and survival analyses were applied to each landrace, using a combination of area-under-disease progress stairs, disease index and apparent infection rate to capture disease metrics as well as disease progression symptoms. Considerable variation was observed among the 20 landraces; however, none exhibited full immunity to Xvm infection. Landraces Haella, Mazia and Lemat showed the lowest susceptibility to Xvm as evidenced by reduced disease units and higher survival rates compared to the susceptible control landrace Arkiya, which exhibited the highest infection level and lowest survival rate, consistent with a high degree of susceptibility to Xvm. Thus, we have in this controlled experiment identified new material suitable for incorporation into future breeding programmes to develop Xvm-resistant enset varieties.

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Acknowledgements

The authors would like to thank McKnight Foundation Collaborative Research Program and the European Community Horizon 2020 grant Project ID 727624, “Microbial uptakes for sustainable management of major banana pests and diseases (MUSA)”, BBSRC GCRF-IAA grant ‘BB/GCRF-IAA/17/22’ and University of Warwick Chancellor's International Scholarship for financial and technical support. We thank Areka and Hawassa Agricultural Research Centers, Southern Agricultural Research Institute and Ethiopian Agricultural Research Institute for hosting and provision of germplasm as well as necessary services and facilities during field study.

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Muzemil, S., Chala, A., Tesfaye, B. et al. Evaluation of 20 enset (Ensete ventricosum) landraces for response to Xanthomonas vasicola pv. Musacearum infection. Eur J Plant Pathol 161, 821–836 (2021). https://doi.org/10.1007/s10658-021-02365-x

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