Abstract
Decisions that improve genebank management depend on understanding patterns of diversity in the genetic resources being conserved. In potato, populations of the wild Mexican species S. verrucosum (ver) collected from the north (N) of the natural range had been shown to be genetically distinctive from those in the south (S). But this geographic association with genetic diversity was noted to be confounded with proximity of other wild potato species, suggesting introgression as a possible cause. RAPD bands that distinguished N and S ver were generated. When their association with nearby populations of other wild potato species was assessed, the hypothesis of introgression was not supported. We conclude that the apparently distinctive genetics of N ver are not explained by common alleles introgressed from proximal populations of other species. Thus, N ver germplasm populations, although less numerous, should be represented in samples of species ver with regard to collection, preservation and evaluation.
Resumen
Las decisiones que mejoran el manejo de un banco de genes dependen del entender los patrones de diversidad en los recursos genéticos que estén siendo conservados. En papa, las poblaciones de la especie mexicana S. verrucosum (ver) colectadas del norte (N) de la cordillera han demostrado ser genéticamente diferentes de aquellas en el sur (S). Pero esta asociación geográfica con diversidad genética estaba confundida con la proximidad de otras especies silvestres de papa, sugiriendo la introgresión como una posible causa. Bandas de RAPD que distinguen ver del N y S fueron generadas. Cuando se evaluó la asociación con poblaciones vecinas de otras especies silvestres, la hipótesis de introgresión no fue respaldada. Concluimos que la genética aparentemente particular de ver del N no es explicada por la introgresion de alelos comunes de poblaciones próximas de otras especies. De tal manera que las poblaciones de germoplasma ver del N, aunque menos numerosas, deberían ser representadas en muestras de especies ver con respecto a la colección, preservación y evaluación.
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Abbreviations
- USPG:
-
US Potato Genebank
- RAPD:
-
Random Amplified Polymorphic DNA
- GS:
-
Genetic Similarity, the simple matching coefficient
- NPGS:
-
US National Plant Germplasm System
- PI:
-
Plant Introduction number
- UPGMA:
-
Unweighted Pair-Group Method
- dms, hjt, hou, mat, mcp, sto, ver:
-
Solanum demissum Lindl., S. hjertingii Hawkes, S. hougasii Correll, S. matahualae Hjert. & T.R. Tarn, S. macropilosum Correll, S. stoloniferum Schltdl. & Bouchet, S. verrucosum Schltdl., respectively (as per Huaman and Ross, 1985)
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Acknowledgments
The authors thank the University of Wisconsin Peninsula Agricultural Research Station staff and program for their cooperation, and Adele Douglass of USPG for technical assistance. We also would like to thank Karen Williams, Johanne Brunet and Sarah Stephenson for their constructive comments and appropriate editing of the manuscript.
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Bamberg, J., del Rio, A.H. Proximity and Introgression of Other Potato Species Does not Explain Genetic Dissimilarity between Solanum verrucosum Populations of Northern and Southern Mexico. Am. J. Pot Res 85, 232–238 (2008). https://doi.org/10.1007/s12230-008-9027-1
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DOI: https://doi.org/10.1007/s12230-008-9027-1