THESIS

eported the fruit of S. ferox and S. torvum should be harvested at more than 65 DAA
when the fruits turned orange (S. ferox) or greenish yellow (S. torvum). On the other
hand, S. melongena and S. trilobatum fruits should be harvested from 55-65 DAA
when the fruit turned yellow or yellow orange for S. melongena and red for S.
trilobatum. It was assumed that at these stages, they were at physiological maturity
and ripening (harvest mature) stages.
1.2 Determination on morphological traits of Southeast Asian Solanum can be
uses to associate with geographical origin
1.2.1 Preliminary analysis
A. Selection of accessions and descriptors
Both quantitative (ratio) and qualitative (nominal) characters
were used to describe the accessions. Out of the 61 descriptors in Appendix A, 25 are
ratio scale traits. On the other hand, those are non-ration traits in the characterization
sheet were referred to as nominal or qualitative traits. Of the 36 nominal traits, only
11 traits were used to cluster-analyze the 89 accessions of Solanum spp. Appendix
Table A4 gives the list of these characters.
B. Identification of species outliers
The descriptive statistic of the 19 ratio scale traits computed
prior to the identification of species outliers within the Solanum spp. data set were
noted (Table 6). These values are used to properly describe the various features of the
data set. On the other hand, the use of boxplot for outlier recognition is much easier
and more practical to use.
The species outliers refer to the accessions with values which
are either too large or too small relative to given accessions on any of the traits. They
exhibit unusual values that are not ordinarily exhibited by the majority of the given
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