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. 2019 Oct 25;182(1):534–546. doi: 10.1104/pp.19.00700

Table 1. Contributions of plant traits to the four main PCA axes.

Values were obtained from a matrix of 11 traits × 64 Galapagos and commercial tomato accessions and are ranked in order of magnitude in PC1 (eigenvalue >1). Traits significantly correlated to each PCA axis (α = 0.05) are indicated in bold. All the traits represent the trait value under salt stress relative to control conditions. The highest contribution per PC is indicated by an asterisk (*).

Traits in Salt Stress Relative to Control Conditions PC1 (32.2%) PC2 (15.2%) PC3 (11.5%) PC4 (10.2%)
Plant fresh mass 19.9* 0.66 1.93 0.95
Leaf area 16.3 0.01 1.65 3.13
Green pixels 15.4 2.60 11.7 1.15
Stem length 10.1 0.50 2.23 4.44
Leaf K+ 8.97 15.5 8.46 5.65
Leaf number 8.00 5.35 11.9 6.95
Root K+ 7.67 0.38 2.27 20.8
Leaf elongation 6.37 0.02 6.30 31.2*
Root Na+ 4.52 11.9 9.39 7.50
Root length 2.22 19.0 2.41 7.81
Leaf succulence 0.47 38.1* 1.34 0.00
Leaf Na+ 0.01 6.13 40.4* 10.5