Selection parameters for resistance to Fusarium oxysporum f. sp. cubense race 1 and race 4 on diploid banana (Musa acuminata Colla) |
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| Authors: | R Morpurgo S V Lopato R Afza F J Novak |
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| Institution: | (1) Plant Breeding Unit, Agency's Laboratories, Joint FAO/IAEA Programme, Seibersdorf, A-2444 Seibersdorf, Austria |
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| Abstract: | Summary Shoot tip cultures from banana clones susceptible and resistant to Fusarium oxysporum f. sp. cubense (FOC) race 1 and race 4 were grown in vitro in the presence of different concentrations of fusaric acid and fungal crude filtrates or inoculated with a conidial suspension of FOC to assess correlation between in vivo and in vitro behaviour. Explants were susceptible to both filtrate and fusaric acid irrespective to their known field resistance/susceptibility response. No clear linkage between in vivo and in vitro behaviour was observed and our results suggest that the use of crude filtrate or non-host specific toxin (fusaric acid) in a screening programme for selecting a novel resistant genotype of Musa to FOC is not feasible. When peroxidase activity was used as a parameter to discriminate between sesceptibility and tolerance, results were in good agreement with field response of host plant to pathogens. Early enzymatic activity increased in the incompatible host-pathogen interaction but not in the compatible interaction.Abbreviations IBA
Indolebutyric acid
- 2iP
6-dimethylallylamino-purine
- VCG
Vegetative Compatibility Group
- FOC
Fusarium oxysporum f. sp. cubense
- IEF
isoelectrofocusing |
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| Keywords: | banana breeding disease resistance Fusarium oxysporum f sp cubense in vitro selection Musa acuminata Panama disease peroxidase activity |
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