Evaluation of Genotype Diversity in Oat Germplasm and Definition of Ideotypes Adapted to the Mediterranean Environment

Table 4

PCA of the 13 characters associated with the 109 oat genotypes, showing the eigenvalues and the proportions of variation associated with the first six axes and eigenvectors of characters.

	Principal component axis
	1	2	3	4	5	6
Eigenvalues	3.04	2.28	1.89	1.21	1.15	0.98
Cumulative variation (%)	23	41	56	65	74	81
Character^†	Eigenvectors
HT (days from 1 April)	−0.2327	−0.4186	−0.2834	0.3489	−0.2195	−0.1977
MT (days from 1 April)	−0.2695	0.4333	−0.2725	0.0460	−0.1254	0.0072
FP (days)	0.0562	0.6020	0.0988	−0.2796	0.1232	0.1765
FOS (% d.w.)	−0.0770	−0.0286	0.0288	−0.5005	−0.0252	−0.7065
PH (cm)	−0.2176	0.0072	0.1010	−0.2823	−0.6572	−0.0406
SY (g m^−2)	0.4534	−0.0912	0.1485	0.1082	0.0597	−0.0213
HI (%)	0.4948	0.0171	−0.0147	0.1663	−0.1274	−0.1637
ST (kg hL^−1)	−0.1208	0.0332	0.2190	0.1169	−0.5004	0.3775
NP/m^2 (no. m^−2)	−0.1543	0.2745	−0.3462	0.1789	0.0740	−0.2773
NPa/m^2 (no. m^−2)	0.0615	0.4011	−0.1019	0.5224	−0.1422	−0.2289
SW/Pa (g )	0.3902	0.0073	−0.4369	−0.2101	−0.2655	0.0868
NS/Pa (no.)	0.2103	−0.0769	−0.6016	−0.2488	−0.0728	0.2345
TSW (g)	0.3575	0.1477	0.2671	0.0614	−0.3417	−0.2597

^†HT: days to heading, MT: days to maturity, FP: filling period, FOS: FOS content, PH: plant height, SY: seed yield, HI: harvest index, ST: Seed test, NP/m²: number of plants per m², NPa/m²: number of panicles per m², SW/Pa: seed weight per panicle, NS/Pa: number of seeds per panicle, TSW: thousand seed weight.