Schriften zu Genetischen Ressourcen - Genres

Morphological characters in garlic compared with existing molecular classifications
The cluster analysis identified five clusters containing between two and 59 accessions
per cluster (Figure 2). Accessions of clusters 1 and 2 are characterised by the
ability to produce a scape clearly longer than the pseudostem and possessing bulbils
in the inflorescence only. Cluster 3 contained only four accessions with a tiny habit.
Cluster 4 is characterised by two accessions without visible scape formation, irregular
bulb structure and a small size of cloves. Cluster 5 covers mainly accessions
which formed a scape shorter than the pseudostem.
S imilarity
Fig. 2: Cluster analysis of 113 accessions of the garlic collection, calculated
with complete linkage method (Euclidean distance)
Several case studies were made to explain the interrelationships between the morphological
marker trees and the already existing molecular marker dendrograms. According
to MAASS and KLAAS (1995), the more basic (ancestral) groups (the longicuspis
group) are scattered through their molecular dendrograms which makes them
difficult for comparisons, whereas the ophioscorodon and sativum groups are sufficiently
homogeneous to use them for comparisons (Figure 3).
The analyses of the morphological parameters were used to select 25 accessions
from the three main clusters 1 (48%), 2 (16%) and 5 (36%). These accessions represent
the greatest diversity of garlic in the north of European Union and are the longday
part of the core collection of garlic which has been established using funds of a
European project aimed at preserving the genetic diversity of Allium.
330
0,00
33,33
66,67
100,00
Cluster 1 Cluster 2
Clus ter 3
Cluster 4 Cluster 5