Morphologic characterization and agronomic evaluation of a Colombian collection of arracacha (Arracacia xanthorrhiza Bancroft.
At a highland site (2120-m altitude) in Antioquia, Colombia, with an average temperature of 17°C and 1800 mm of annual rainfall, a study was conducted to determine the qualitative and quantitative variability exhibited by a collection of 53 farmer varieties of arracacha, collected in several municipalities of Nariño in southern Colombia. A list of descriptors developed by the International Potato Centre, with modifications introduced by the National Programmes of Plant Genetic Resources and Biotechnology of CORPOICA (Colombian Corporation for Agricultural Research) was employed, recording 43 descriptors, from which 29 were of a qualitative and 14 of a quantitative nature. Ample variability was found for the qualitative attributes, with 26 out of the 29 variables being polymorphic, without a defined cluster pattern, obtained from similarity coefficients between materials, in relation to the municipality of collection of the studied accessions. All quantitative traits presented variability, contributing all of them to the first 5 principal components, which accounted for 74% of the total quantitative variability. Quantitative clusters at core level (i.e. groups of 2 materials) were obtained in relation to the municipalities in which the materials were collected. Also, a low level of agreement between the qualitative and quantitative clustering was obtained. From authors' summary. KEYWORDS: TROPAG | Arracacia xanthorrhiza | root crops | Arracacia xanthorrhiza | genetic variation | plant anatomy | agronomic characters | germplasm | South America | Colombia | Antioquia.