Morphological phenotypic dispersion of garlic cultivars by cluster analysis and multidimensional scaling

作者：da Silva Anderson Rodrigo^*; Cecon Paulo Roberto; dos Santos Dias Carlos Tadeu; Puiatti Mario; Finger Fernando Luiz; Souza Carneiro Antonio Policarpo

来源：SCIENTIA AGRICOLA, 2014, 71(1): 38-43.

DOI：10.1590/s0103-90162014000100005

• Mimi sativum L.
• nMDS
• UPGMA
• genetic divergence

Multivariate techniques have become a useful tool for studying the phenotypic diversity of Germplasm Bank accessions, since they make it possible to combine a variety of different information from these accessions. This study aimed to characterize the phenotypic dispersion of garlic (Allium sativum L.) using two multivariate techniques with different objective functions. Twenty accessions were morphologically characterized for bulb diameter, length, and weight; number of cloves per bulb; number of leaves per plant; and leaf area. Techniques based on generalized quadratic distance of Mahalanobis, UPGMA (Unweighted Pair Group Method with Arithmetic Mean) clustering, and nMDS (nonmetrric MultiDimensional Scaling) were applied and the relative importance of variables quantified. The two multivariate techniques were capable of identifying cultivars with different characteristics, mainly regarding their classification in subgroups of common garlic or noble garlic, according to the number of cloves per bulb. The representation of the phenotypic distance of cultivars by multidimensional scaling was slightly more effective than that with UPGMA clustering.

• 出版日期2014-2