Resistance to Ralstonia solanacearum of sexual hybrids between Solanum commersonii and S. tuberosum
2009
E02427
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Title
Resistance to Ralstonia solanacearum of sexual hybrids between Solanum commersonii and S. tuberosum
Publication Date
2009
Call Number
E02427
Summary
This research was carried out to study the levels of bacterial wilt resistance and genetic diversity of (near)pentaploid sexual hybrids between S. commersonii (2n=2x=24, 1EBN) and cultivated S. tuberosum. Following artificial inoculations with Ralstonia solanacearum, wilting degree was estimated on a scale from 0 to 4, and seven genotypes of 26 (27%) displaying a S. commersonii like behavior were identified. Latent bacterial colonizations were detected in roots of symptomless S. commersonii and hybrids, whereas no bacterial populations were detected within stems. This suggests that the movement and/or growth of the bacterium in the aerial part were strongly inhibited. A molecular study with AFLP markers clustered hybrids into nine groups and provided evidence that resistant hybrids were slightly more similar to cultivated S. tuberosum than to the wild parent. This is important in view of the re-establishment of the cultivated genetic background through backcrosses. Hybrids displayed good fertility and are being used for further breeding efforts.
Journal Citation
v.86(3):196-202, AMERICAN JOURNAL OF POTATO RESEARCH
Contact Information
harvest@worldveg.org
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Research > Published Articles