3.2.2. Cluster analysis based on SSR and SRAP markers
On the basis of SSR-SRAP molecular marker data, 112 accessions of yam
were divided into six groups (Fig. 3-A). The G1 group included CY-256
and CY-257 from Hainan Province, and they belonged to D.
esculenta . A total of 51 accessions were assigned to the G2 group, with
CY-40 belonging to D.
opposita . The G3 group contained 14 accessions, with CY-179 and CY-251
belonging to D. persimili s, and the similarity coefficient
between CY-244 and CY-247 reached 0.98, suggesting that they may be of
same variety. Seven accessions were
categorized into the G4 group, and
the accession of CY-117 belonged to D. opposita , while the
remaining belonged to D. alata . The G5 group was a collection ofD. fordii and D. alata , in which 29 accessions wereD. alata , and the remaining (CY-193, CY-201, CY-206, and CY-209)
were D. fordii . In the G6
group, CY-227 and CY-23 were from D. opposita , and the remaining
accessions were from D. alata .
The results of PCoA was basically
consistent with those of molecular marker cluster analysis (Fig. 3-B).
The 112 accessions could be divided into three groups (G1, G2, and G3).
The G1 group
composed
of D. persimilis , the G2 group was D. opposita , and the G3
group consisted of D. alata and D. fordii .