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Table 5 Matrix of coefficients of Eigenvectors, eigenvalues and variance of the first four principal components extracted from main essential oil compositions and climatic factors in 20 populations of Nepeta binaludensis

From: Influence of climatic factors on essential oil content and composition of 20 populations of Nepeta binaludensis Jamzad from Iran

Variable

PC1

PC2

PC3

PC4

1,8-cineole

0.34

− 0.10

0.00

− 0.28

myrcene

0.32

− 0.19

− 0.18

− 0.11

p-cymene

0.33

− 0.05

0.14

0.09

nepetalactone

− 0.36

0.13

− 0.01

0.19

Wet Season temperature °C

0.20

0.33

− 0.07

0.17

Annual temperature °C

0.19

0.36

-0.10

0.03

Annual precipitation (mm)

− 0.18

− 0.37

0.10

− 0.06

Hot season raining (mm)

− 0.18

− 0.36

0.14

− 0.02

Altitude

− 0.06

− 0.36

0.12

0.19

Degree of slope

− 0.01

− 0.31

-0.27

0.12

Slope%

0.01

− 0.30

-0.28

0.11

δ-tepineol

0.25

− 0.08

0.37

− 0.06

γ-terpinene

0.05

− 0.06

-0.48

0.25

α-terpinene

− 0.17

− 0.04

-0.31

0.23

Tepinene-4-ol

0.30

− 0.07

0.10

0.42

trans-sabinene hydrate

0.10

− 0.19

0.17

0.30

sabinene

0.18

− 0.12

− 0.23

− 0.49

Oil yield

− 0.21

− 0.10

0.12

− 0.34

Eigenvalue

6.38

5.40

2.62

1.78

Proportion

0.32

0.27

0.13

0.09

Cumulative

0.32

0.59

0.72

0.81

  1. aThe underline coefficients have significant correlation with the relevant axes
  2. By increasing the altitude, changes in growth and essential oil composition of the plant are observed
  3. Result of correlation analysis showed that essential oil yield was positively correlated with precipitation, and negatively with temperature. In the present study the populations with high-amount of nepetalactone and 1,8 cineole were identified,
  4. The populations of cluster 2 with higher amount of 1,8-cineole, were growing in the high altitude, cold, rainy and sloping areas