|Herrera, Maria Del Rosar|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/24/2005
Publication Date: 1/15/2006
Citation: Nunez, J., Herrera, M., Trujillo, G., Guzman, F., Spooner, D.M., Ghislain, M. 2006. Gene pool structure of cultivated potatoes assessed by SSR marker analyses [abstract]. 2nd Solanaceae Genome Workshop. p. 15. Interpretive Summary:
Technical Abstract: The high throughput genotyping facility established in 2004 has produced a large dataset of microsatellite (SSR) markers for cultivated potato. The objectives of this research were to analyze the gene pool structure of the cultivated potato as well as increase the number of SSR markers for potato germplasm analyzes. Potato landraces from all cultivated species or taxonomic groups have been included in the potato composite genotyping set. So far, 716 genotypes by 53 SSR markers constitute the potato SSR data set. The analysis of this large data set was performed by cluster analyses using Darwin software kindly provided to us by CIRAD. These results revealed both expected and unexpected structure of the cultivated potato germplasm. The Chilean Chilotanum group forms a clearly separated cluster from the other tetraploid Andigenum group which agrees with the hypothesis Chilotanum deriving from Andigenum through the hybridization with another species, possibly a wild species. The diploid species form a well separate structure from the tetraploid potatoes. Within diploid species, the Phureja group form a well separated cluster which was unexpected based on previous studies at CIP using RAPD markers. The Stenotomum group form a wide and highly diverse group with one major cluster composed of both goniocalyx and stenotomum accessions. This finding was expected as the species S. goniocalyx was recognised by some potato taxonomists to be a sub-species of S. stenotomum. The triploid Chaucha group does not form well separated clusters, instead Chaucha landraces are found intermixed with all other groups which is an evidence its hybrid origin between diploid and tetraploid potatoes. Finally the diploid Ajanhuiri group, the triploid Juzepsuki group, and the pentaploid Curtilobum group appeared to separate markedly with all other taxonomic groups. This may indicate an independent domestication process from other wild ancestors. Many of potatoes are indeed refered to as the bitter potatoes and are usually found in the high Andes. Hence, the native potato germplasm appears to be highly structured.