Wageningen Universiteit en Researchcentrum
20 dec 2011 11:00
Locatie: Aula, gebouw 362, Gen. Foulkesweg 1, Wageningen
Organisatie: Wageningen University
Promotor: prof.dr. R.G.F. Visser (Plantenveredeling ihb genetische
variatie en reproductie)
Co-Promotor: dr. B. Vosman, dr. R.G. van den Berg
Carchi (North), Chimborazo (Center) and Loja (South) were identified as
representative areas for potato diversity in Ecuador. Surveys and
farmer meetings were used to describe the landrace-holders and the
characteristics of the farming systems they use. The vulnerability of
potato conservation varies among the study areas. Diploid, triploid and
tetraploid potato landraces showed a high allelic diversity. At the
tetraploid level (comprising 96 landraces) this was comparable to the
variation present in an European collection of more than 800 varieties.
There was no clear grouping of material collected according to study
region, suggesting extensive movement of seed potatoes all over
Ecuador. Characterization of genetically different landraces for late
blight resistance showed variation for this trait. Most of the
landraces were susceptible to moderately resistant. Varying levels of
dry matter, total polyphenol and total carotenoid contents were found
among Ecuadorian potato landraces, some were comparable to the improved
varieties.
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Title thesis: Potato landraces: Description and dynamics in three areas
of Ecuador
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