Abstract
A total of 252 wild Solanum accessions and one population of 49 introgression lines of LA716 were screened for resistance to a race 1/biovar 4/phylotype I strain Pss186 of Ralstonia solanacearum. Most wild tomato accessions were highly susceptible. However, five accessions of S. pennellii, i.e. LA1943, LA716, LA1656, LA1732 and TL01845 were resistant to strain Pss186. These accessions were then challenged against two other race 1/phylotpye I strains Pss4 and Pss190, which were more aggressive. All the five S. pennellii accessions were susceptible to Pss4, but displayed high to moderate resistance to Pss190 with a percentage of wilted plants ranging from 0% to 60%. Pss190 is an aggressive strain that made a resistant tomato line Hawaii 7996 susceptible. Thus, the results found in this study provide evidence of the presence of strain-specific resistance. LA3501, which has an introgression segment on chromosome 6, was found to be resistant to Pss186 among the screened introgression lines. This confirms the importance of resistance trait loci on chromosome 6 that have been identified by other studies. This is the first report of S. pennellii being resistant to bacterial wilt. These new resistant sources will provide breeders with more resources to breed for stable resistance to bacterial wilt of tomato.
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Acknowledgements
This paper is based on a Ph.D. dissertation by Truong Thi Hong Hai, who received a scholarship from the German government through project GTZ81070160. We thank C.-F. Hsu and H.-H. Liau for their technical assistance, and D. R. Ledesma for helpful statistical analysis.
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Hong Hai, T.T., Esch, E. & Wang, JF. Resistance to Taiwanese race 1 strains of Ralstonia solanacearum in wild tomato germplasm. Eur J Plant Pathol 122, 471–479 (2008). https://doi.org/10.1007/s10658-008-9314-1
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DOI: https://doi.org/10.1007/s10658-008-9314-1