3.4. Fingerprint difference among horticultural types
The cultivars of the three variants have not been given a formal horticultural type, and therefore were not included when analyzing the fingerprint difference among horticultural types. To examine the genetic relationships among the 120 C. goeringii cultivars, principal coordinate analysis (PCoA) was carried out based on their genetic similarity. As a result, as with the data from cluster analysis ( Fig. 1), a recognizable DNA fingerprint profile among the seven horticultural types was not observed (Fig. 2). However, some weak evidence suggested that cultivars of the same horticultural type had a tendency to be clustered together. For example, the clade A2 was highly populated with cultivars of the plum petal type, more than half (25/43) of these cultivars appeared in this clade and more than half (25/39) of clade A2 cultivars were of the plum petal type (Fig. 1). Similarly, for cultivars of the butterfly petal type, 13 out of 18 appeared in Clade A1 (Fig. 1).