Phenotypic Diversity within Ugandan Yam (Dioscorea species) Germplasm Collection

Table 4

The proportion of the morphological variation and traits contribution explained by the first six principal components.

Traits	PC1^§	PC2	PC3	PC4	PC5	PC6
Vine per plant	−0.24	0.05	−0.06	0.61	−0.20	0.28
Sprout on spines	0.34	0.39	0.58	−0.19	−0.03	0.02
Vine colour	−0.08	0.16	0.29	0.17	−0.35	−0.32
Vine spines	0.16	0.22	0.58	−0.44	−0.05	0.12
Leaf position	−0.06	0.05	−0.06	0.33	0.25	−0.29
Leaf width	−0.81	−0.22	0.02	−0.19	−0.12	−0.24
Leaf length	−0.77	−0.17	−0.28	−0.11	−0.21	−0.24
Leaf area	−0.84	−0.24	−0.12	−0.15	−0.18	−0.27
Leaf shape	−0.29	−0.48	−0.42	0.11	0.26	−0.02
Leaf density	−0.68	0.24	0.06	−0.02	−0.05	0.13
Petiole length	−0.77	−0.02	−0.07	−0.24	−0.19	−0.24
Plant vigour	−0.61	0.27	0.23	−0.17	0.20	0.11
Petiole colour	0.19	−0.12	−0.34	−0.54	−0.24	0.27
Sex of flower	−0.01	0.85	−0.35	−0.02	0.01	−0.09
Flower intensity	0.02	0.83	−0.40	−0.02	0.03	−0.04
Days to flowering	0.04	0.87	−0.38	−0.03	0.02	−0.09
Flower length	0.00	0.80	−0.42	−0.04	0.08	−0.05
Yam anthracnose disease	0.01	−0.22	−0.37	−0.46	−0.14	0.41
Yam virus disease	0.18	−0.29	−0.36	0.19	−0.06	0.27
Tuber weight per plot	−0.79	0.04	0.14	0.14	0.13	0.13
Tuber number per plot	−0.40	0.17	−0.01	0.39	−0.03	0.44
Tuber circumference	−0.53	0.28	0.14	0.12	−0.36	0.14
Tuber surface texture	−0.52	−0.28	−0.33	0.03	−0.07	0.15
Tuber branching	−0.56	0.09	0.14	−0.05	0.56	−0.04
Tuber length	−0.56	0.36	0.40	0.07	−0.06	0.15
Tuber shape	−0.37	−0.03	−0.07	−0.32	0.57	0.15
Tuber size	−0.68	0.25	0.20	−0.03	−0.04	0.31
Dry matter content	0.22	0.30	−0.09	−0.15	−0.20	0.04
Eigenvalue	6.34	4.16	2.46	1.76	1.38	1.28
Proportion explained (%)	22.64	14.84	8.78	6.28	4.94	4.57
Cumulative proportion (%)	22.64	37.48	46.26	52.54	57.48	62.05

^§Principal components (values in bold indicate the most relevant characters (>0.45) that contributed to the variation of the components).