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5'-Anchored simple-sequence repeat primers are useful for analysing potato somatic hybrids
D Matthews1, J McNicoll2, K Harding2
1Molecular Biology and Diagnostics Section, National Institute of Agricultural Botany, Huntingdon Road, Cambridge, Cambridgeshire, CB7 0LE, UK. e-mail: dmatthews.niab.hr@gtnet.gov.uk Fax: +44-01223-277602), , , , , , GB.
Somatic hybrids between potato (Solanum tuberosum) and Solanum sanctae-rosae exhibit enhanced traits like nematode resistance. Inter-SSR PCR analysis revealed genetic variations, including S. sanctae-rosae specific bands and genomic rearrangements in the hybrids.
Area of Science:
- Plant genetics
- Molecular biology
- Agricultural science
Background:
- Somatic hybridization is a key technique for combining desirable traits from different plant species.
- Solanum sanctae-rosae possesses valuable traits, such as potato cyst nematode resistance, not found in cultivated potato (Solanum tuberosum).
- Characterizing the genetic makeup of somatic hybrids is crucial for understanding trait inheritance and genome stability.
Purpose of the Study:
- To analyze the genetic composition of somatic hybrids derived from Solanum tuberosum cv 'Brodick' and S. sanctae-rosae.
- To identify genetic markers specific to S. sanctae-rosae in the hybrid material.
- To assess the genetic stability and detect genomic alterations in the somatic hybrids.
Main Methods:
- Somatic hybridization was performed between Solanum tuberosum cv 'Brodick' and S. sanctae-rosae.
- DNA was extracted from parent plants and somatic hybrids.
- Inter-simple sequence repeat (inter-SSR) PCR was employed using 5'-anchored di- and tri-nucleotide repeat primers.
- PCR products were analyzed using polyacrylamide gel electrophoresis and silver staining.
Main Results:
- Inter-SSR PCR generated an average of 30.31 bands per primer, with 8.19 polymorphic bands on average.
- S. sanctae-rosae-specific DNA bands were detected in the somatic hybrid material.
- Evidence of deletions, substitutions, and rearrangements within the hybrid genome was observed.
Conclusions:
- Inter-SSR PCR is an effective method for analyzing the genetic profiles of somatic hybrids.
- The somatic hybrids contain genetic material from S. sanctae-rosae, confirming successful introgression of traits.
- Genomic alterations in the somatic hybrids suggest ongoing genome restructuring post-hybridization.
