Table 2 Radial variation of cross-sectional parameters of earlywood tracheids and correlation coefficients between CE and σ_e5% of specimens from seven sugi cultivars

Tangential diameter (μm)

18.3 (4.3)^a

22.4 (5.1)^b

25.1 (4.8)^c

25.6 (5.0)^c

− 0.560**

Radial diameter (μm)

29.9 (6.6)^a

34.4 (7.0)^b

38.2 (6.6)^c

36.8 (7.8)^d

− 0.447**

R/T

1.7 (0.5)^a

1.6 (0.4)^b

1.56 (0.4)^b

1.48 (0.4)^c

0.303*

Cell wall thickness (μm)

1.3 (0.3)^a

1.4 (0.3)^b

1.5 (0.3)^c

1.5 (0.3)^c

− 0.356*

θ (°)

9.2 (7.3)^a

10.3 (7.8)^b

15.5 (9.1)^c

17.8 (9.4)^d

− 0.425**

n

740

1000

550

849

49