Abstract
The diversity of germplasm accession can be grouped by specific traits using cluster analysis to determine the similarity between accessions. The objective of this research was to classified the accession of sweetpotato based on quantitative characteristics using principal component analysis and cluster analysis. The research was conducted in April-August 2016 at Kendalpayak Research Station, Malang, East Java, Indonesia. The material used was 183 accessions of sweetpotato from Indonesian Legumes and Tuber Crops Research Institute (ILETRI) germplasm collection. The research was arranged in a plot size of 1 m × 5 m and 100 × 25 cm in spacing (single row). The variables observed included: plant type, leaf shape, leaf lobes types, leaf lobes number, petiole length, weight of vine, harvest index, number and weight of marketable root, number and weight of nonmarketable root, number and weight of root perplant, and root yield. The PCA identified five principal components that explained 83,2% of total variation present in the genotypes. The cluster analysis was based on 83% of similarity. It grouped 183 accessions into 13 clusters. The traits that most contributed to the diversity were petiole length, weight of vines, leaf lobes number, leaf lobes types, and leaf shape.
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