Towards the development of a Cavendish banana resistant to race 4 of fusarium wilt: gamma irradiation of micropropagated Dwarf Parfitt (Musa spp., AAA group, Cavendish subgroup)
M. K. Smith A E , S. D. Hamill A , P. W. Langdon B , J. E. Giles C , V. J. Doogan C and K. G. Pegg DA Department of Primary Industries and Fisheries Queensland, Maroochy Research Station, PO Box 5083, SCMC, Nambour, Qld 4560, Australia.
B Department of Primary Industries and Fisheries Queensland, South Johnstone Research Station, PO Box 20, South Johnstone, Qld 4859, Australia.
C Department of Primary Industries and Fisheries Queensland, Locked Mail Bag 4, Yeerongpilly, Qld 4105, Australia.
D Department of Primary Industries and Fisheries Queensland, 80 Meiers Road, Indooroopilly, Qld 4068, Australia.
E Corresponding author. Email: mike.smith@dpi.qld.gov.au
Australian Journal of Experimental Agriculture 46(1) 107-113 https://doi.org/10.1071/EA04175
Submitted: 16 August 2004 Accepted: 23 December 2004 Published: 9 February 2006
Abstract
‘Dwarf Parfitt’, an extra-dwarf Cavendish cultivar with resistance to subtropical race 4 Fusarium oxysporum f. sp. cubense (Foc), was gamma irradiated at a dose of 20 Gy and putative mutants were recovered with improved agronomic characteristics. Further screening of putative mutants for improved yield and fruit size, as well as a degree of resistance to fusarium wilt, led to the selection of a line (DPM25) with improved productivity when grown on soils infested with subtropical race 4 Foc. DPM25 was equal to the industry standard, ‘Williams’, in every agronomic trait measured and it consistently showed a lower incidence of fusarium wilt. Further improvement of field resistance to race 4 Foc is needed in DPM25 and further cycles of mutation induction and selection is an option discussed.
Additional keywords: mutation breeding, somaclonal variation, tissue culture.
Acknowledgments
We thank L. Pedwell for the use of his land as a race 4 Foc experimental site. The technical assistance of A. Hardwick and J. Hertrick is gratefully appreciated. Thanks also to J. Daniells for his constructive comments during his review of the manuscript. We acknowledge the financial support of the Australian Centre for International Agricultural Research, the Queensland Banana Industry Protection Board and Horticulture Australia Limited.
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