PRINCIPAL COMPONENT ANALYSIS
The cumulative percentages of PC1, PC2, PC3, and PC4 in all
morphological variations were 42.9%. (PC1 = 15.0%, PC2 = 10.5%, PC3 =
9.1%, PC4 = 8.3%; Table 1)
PC1 showed positive and large values above 0.7 for internode length,
intercluster length, distance from the ground to the first
inflorescence, plant height at flowering, plant height at
fruiting/number of inflorescences, plant height at fruiting and spike
length/(number of inflorescences -1).
These results suggest that PC1 is an index of plant height.
PC2 showed large positive or negative values above 0.7 for flower color
value of L*, a*, b*.
PC3 showed positive and large values (more than 0.7) for days to
flowering, first flowering nodal position and corolla length.
PC4 showed large positive values above 0.7 for leaf color color value of
L*, a*, b*..
The scatter plots of the scores of the principal components PC1 and PC3
scores for plant shape, days to flowering, and PC2 and PC4 scores for
color showed differed among the regions (Fig. 2A, 2B).
In Fig. 1A, the Tsushima populations tended to show positive values for
PC1 and negative values for PC3, indicating high plant height and early
flowering.
On the other hand, the Nagasaki mainland populations tended to be
negative values for PC2, indicating a low plant height characteristic.
The Goto Islands populations showed no tendency for PC1 and PC3.
The Koshikijima Islands populations tended to show a positive value for
PC3, indicating late flowering.
Subsequently, Figure 1B showed that the Tsushima populations tended to
show positive values for PC2 and negative values for PC4, indicating a
characteristic of deep flower and leaf colors.
The populations in Nagasaki mainland and Goto Islands had the
characteristics which the color of flowers was light because the value
of PC2 tended to show negative in those populations.
The population of the Nagasaki mainland populations and the Goto Islands
populations showed a tendency toward negative values of PC2, indicating
a characteristic of light flower color.
The Koshikijima Islands population showed characteristics intermediate
to those of other regions.