Genotypic Variability in Some Morpho-Physiological Traits in Different Environments and Their Relationship with Cassava (Manihot esculenta Crantz) Root Yield
Table 9
Principal component (PC) analysis of 13 traits showing their relative contributions to the total variation among 20 cassava genotypes in different environments.
Traits
Fumesua (forest ecology)
Nyankpala irrigated
Nyankpala nonirrigated
PC1
PC2
PC3
PC4
PC5
PC1
PC2
PC3
PC4
PC5
PC1
PC2
PC3
PC4
PC5
AGBio (t ha−1)
0.34
0.36
−0.08
0.19
0.15
0.22
0.46
0.25
0.02
0.05
−0.16
−0.09
0.35
−0.40
0.44
Branchno_plt
0.02
0.48
0.26
−0.42
0.06
−0.30
0.35
−0.27
0.34
0.01
0.34
0.01
0.27
0.47
−0.09
CMD (1–5)
−0.33
0.01
0.32
−0.13
0.30
0.22
−0.06
−0.25
−0.01
−0.02
−0.17
−0.14
−0.26
0.39
0.43
HI
0.32
−0.34
−0.03
−0.27
0.01
−0.45
−0.26
0.03
0.11
−0.23
0.19
0.46
−0.12
−0.16
−0.24
L : G ratio
0.15
0.01
0.56
0.39
−0.14
0.41
−0.12
0.11
0.54
−0.12
−0.43
−0.14
0.25
0.03
−0.42
L_temp (°C)
−0.14
0.21
−0.34
0.14
−0.36
0.14
0.29
−0.13
−0.20
−0.38
0.39
−0.25
0.05
−0.05
−0.31
Levs_plt−1
0.02
0.53
0.10
−0.38
−0.06
−0.22
0.47
−0.14
0.37
0.08
−0.02
0.16
0.37
0.62
0.04
Plt_ht (cm)
−0.07
0.14
−0.20
0.31
0.80
0.34
0.18
−0.02
−0.29
0.35
0.15
−0.41
0.13
0.01
0.25
Rt_girth (cm)
0.26
−0.14
−0.39
−0.33
0.07
−0.29
−0.04
0.38
−0.39
−0.04
0.18
0.48
−0.15
0.03
0.31
Rt_length (cm)
0.42
−0.07
0.29
0.19
−0.04
0.21
−0.21
0.49
0.35
−0.20
−0.42
0.20
0.17
0.05
−0.26
Rtno_plt
0.39
0.08
0.11
0.02
0.07
0.10
0.32
0.41
−0.06
0.10
0.11
−0.03
0.57
−0.17
0.14
Rt_yld (t ha−1)
0.47
0.09
−0.14
−0.06
0.10
−0.32
0.22
0.43
0.07
−0.04
0.16
0.41
0.36
−0.14
0.09
St_cond (mmol m−2s−1)
0.01
−0.36
0.28
−0.38
0.25
−0.12
−0.21
0.08
0.18
0.78
−0.44
0.21
0.01
0.08
0.16
Eigenvalues
3.56
2.23
2.03
1.40
0.97
2.90
2.13
1.98
1.36
0.97
3.19
2.62
2.01
1.29
1.11
% variation
27.40
17.17
15.60
10.77
7.45
22.34
16.39
15.23
10.46
7.43
24.55
20.12
15.42
9.90
8.50
Cumulative
27.40
44.57
60.17
70.94
78.39
22.34
38.73
53.96
64.42
71.85
24.55
44.67
60.09
69.99
78.49
AGBio = above ground biomass yield (t ha−1), Branchno_plt = number of branches per plant, CMD (1–5) = cassava mosaic virus disease score (1 = healthy plant and 5 = highly diseased plant), HI = harvest index, L : G ratio = storage root length : girth ratio, L_temp = leaf temperature (°C), Levs_plt = number of leaves per plant, Plt_ht (cm) = plant height (cm), Rt_girth = storage root girth (cm), Rt_length = storage root length (cm), Rtno_plt = root number per plant, Rt_yld = storage root yield (t ha−1), and St_cond = stomatal conductance (mmol−2s−1).
