Abstract
Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo is reported to be decreased by root-knot nematode galling and by introduction of the Mi gene for nematode resistance. The Mi gene is located on tomato chromosome 6, which also carries a major quantitative trait locus (QTL) for resistance to bacterial wilt. Bacterial wilt resistance was evaluated in F3-progenies derived from two crosses between near-isogenic lines, Caraibo x Carmido and CRA 66 x Cranita, differing for small and large introgressions from Lycopersicon peruvianum that carry the Mi gene, respectively. These introgressed regions were mapped using RFLP markers. Plants homozygous Mi/Mi (susceptible to the nematode) and homozygous Mi/Mi (resistant) for the Mi gene were selected in F2 and used to produce F3 progenies. Parents and F3-lines with Mi/Mi had resistance to bacterial wilt reduced by 30% in Caraibo x Carmido and by 15% in CRA 66 x Cranita. Caraibo and Carmido were demonstrated to be isolines and the small introgression from L. peruvianum resulted in loss of the QTL for bacterial wilt resistance, which is probably allelic or linked in repulsion to the Mi gene. In contrast, resistance to bacterial wilt segregated in the F3 lines from the cross CRA 66 x Cranita, giving families varying in resistance between the levels shown by the parents. Consequently, two hypotheses were considered: (i) after only four backcrosses, the parents were not isolines and the genes for resistance to bacterial wilt from CRA 66 were still segregating, and (ii) the parents were isolines and variation in resistance to bacterial wilt in F3 was due to recombination events among the large L. peruvianum introgressed chromosome region from Cranita.
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Claims 5
Claim · model-written summary
Mi/Mi parents and F3 lines of the Caraibo x Carmido cross had bacterial wilt resistance reduced by 30%.
- Taxon
- tomato
Solanum lycopersicume0 - Material
- Caraibo x Carmidoe2
- Treatment
- Mi genee4
- Interactor
- Ralstonia solanacearum
Ralstonia solanacearume0pathogen - Gene
- Mi/Mie2
- Outcome
- resistance to bacterial wilte2
- Direction
- reducede2
- Value
- 30%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo”
e4“Plants homozygous Mi/Mi (susceptible to the nematode) and homozygous Mi/Mi (resistant) for the Mi gene were selected in F2 and used to produce F3 progenies”
e2“Parents and F3-lines with Mi/Mi had resistance to bacterial wilt reduced by 30% in Caraibo x Carmido and by 15% in CRA 66 x Cranita”
Claim · model-written summary
Mi/Mi parents and F3 lines of the CRA 66 x Cranita cross had bacterial wilt resistance reduced by 15%.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- CRA 66 x Cranitae2
- Treatment
- Mi genee4
- Interactor
- Ralstonia solanacearumRalstonia solanacearume0pathogen
- Gene
- Mi/Mie2
- Outcome
- resistance to bacterial wilte2
- Direction
- reducede2
- Value
- 15%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo”
e4“Plants homozygous Mi/Mi (susceptible to the nematode) and homozygous Mi/Mi (resistant) for the Mi gene were selected in F2 and used to produce F3 progenies”
e2“Parents and F3-lines with Mi/Mi had resistance to bacterial wilt reduced by 30% in Caraibo x Carmido and by 15% in CRA 66 x Cranita”
Claim · model-written summary
The small introgression from L. peruvianum resulted in loss of the QTL for bacterial wilt resistance, probably allelic or linked in repulsion to the Mi gene.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- small introgression from L. peruvianume3
- Gene
- QTLe3
- Outcome
- QTL for bacterial wilt resistancee3
- Direction
- resulted in loss ofe3
- Qualifier
- probably allelic or linked in repulsion to the Mi genee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo”
e3“the small introgression from L. peruvianum resulted in loss of the QTL for bacterial wilt resistance, which is probably allelic or linked in repulsion to the Mi gene”
Claim · model-written summary
Caraibo and Carmido were demonstrated to be isolines.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- Caraibo and Carmidoe6
- Outcome
- isolinese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo”
e6“Caraibo and Carmido were demonstrated to be isolines”
Claim · model-written summary
Resistance to bacterial wilt segregated among the F3 lines of the CRA 66 x Cranita cross, giving families varying between the parental levels.
- Taxon
- tomatoSolanum lycopersicume0
- Material
- CRA 66 x Cranitae5
- Outcome
- resistance to bacterial wilte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resistance to bacterial wilt, caused by Ralstonia solanacearum, in tomato lines CRA 66 and Caraibo”
e5“resistance to bacterial wilt segregated in the F3 lines from the cross CRA 66 x Cranita”
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