THESIS

However, the determination of the morphological traits associated with the
geographical origin by using 11qualitative traits was shown the more congruence than
using quantitative traits when compared to variation of dendrogram of cluster analysis
(Figure 18 and 19). For S. melongena the major part (approximately 27.54 %) of the
variation was found within collection areas, where the major part (approximately
73.68 %) of the variation was found in Thailand. The variations of S. melongena were
also found in Laos and Vietnam, approximately 21.05 % and 5.26 %, respectively.
Furthermore, S. melongena was belonging to cluster I, II and III.
This study was reported the association between geographical origin and
morphological traits of Solanum species in Southeast Asia. However, the ability to do
so, depends on several factors such as details information of geographical coordinates,
altitude, latitude and longitude. For this study, we did not include the on-site gathering
of any geographical data.
Moreover, the genetic uniformity of multiple accessions sampled from the
same site was significant to this study. According to del Rio and Bamberg (2004), the
intra-population homogeneity also increases the chance of stable samples from a
single site. If a population is heterogeneous, there is a chance of particular phenotypes
presented for sampling will be different depending on the particular growing
conditions at time of collection. But when the populations are homogenous, any
sample size, pattern or timing will be resulted in a stable, representative sample.
Within accession uniformity and distinction are needed to reveal the significant
correlations of breeding behavior. Inbreeding may greatly reduce gene flow and
genetic diversity is reduced within populations, but increase between populations
(Lovesless and Hamrick, 1984). Although inbreeding may be more outcrossing
among population heterogeneity (Schoen and Brown, 1991). del Rio and Bamberg
(2002) confirmed the suspect tailored low heterogeneity within accessions of S.
verrucosum when compared to the other species (S. fendleri, S. sucrense and S.
jamesiie) showing no significant correlations with in ecogeographic parameters (del
Rio and Bamberg, 2002).
76