Assessment of Cowpea (Vigna unguiculata (L.) Walp.) Mutant Lines for Drought Tolerance

Table 5

Eigenvalue and vectors of principal component analysis for potential yield (YP), stress yield (YS), and stress tolerance indices.

Component			PM	TOL	SSI	STI	Cumulative %	Eigenvalue
1	−0.24	0.53	0.38	−0.41	−0.45	0.45	58	3.5
2	0.64	0.01	0.44	0.41	0.33	0.34	98	2.4

MP: mean productivity; Tol: stress tolerance, SSI: Stress Susceptibility Index, STI: Stress Tolerance Index; : yield in nonstress condition; and : yield in stress condition.