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Table 2 Variation in bordered pit anatomy and embolism resistance between tracheids from branch, trunk, and root material of four conifer species

From: Low intra-tree variability in resistance to embolism in four Pinaceae species

 

Anatomical traits

Hydraulic traits

D PA

D TO

O

P 50

P. pinaster

Branch

4.3 ± 0.1 a

7.5 ± 0.1 a

0.44 ± 0.02 a

−3.76 ± 0.23 a

Trunk

6.0 ± 0.3 b

10.2 ± 0.3 b

0.42 ± 0.05 a

−3.19 ± 0.15 b

Root

9.0 ± 0.1 c

9.8 ± 0.2 b

0.32 ± 0.01 b

−2.58 ± 0.13 c

P. menziesii

Branch

4.1 ± 0.09 a

6.9 ± 0.1 a

0.40 ± 0.01 a

−3.9 ± 0.31a

Trunk

5.5 ± 0.17 b

9.6 ± 0.3 b

0.43 ± 0.03 a

−3.37 ± 0.22 b

Root

4.3 ± 0.12 b

9.0 ± 0.5 b

0.43 ± 0.01 a

−3.91 ± 0.34 a

P. sylvestris

Branch

4.1 ± 0.1 a

6.9 ± 0.1 a

0.40 ± 0.03 a

−3.84 ± 0.08 a

Trunk

5.4 ± 0.1 b

9.7 ± 0.2 b

0.42 ± 0.01 a

−3.20 ± 0.25 b

Root

5.8 ± 0.1 b

10.3 ± 0.2 b

0.43 ± 0.03 a

−3.18 ± 0.06 b

C. atlantica

Branch

3.9 ± 0.1 a

7.2 ± 0.14 a

0.43 ± 0.02 a

−4.92 ± 0.17 a

Trunk

5.1 ± 0.1 b

8.9 ± 0.18 b

0.44 ± 0.02 a

−4.74 ± 0.08 a

Root

  1. Mean values (±SE) of the horizontal pit aperture diameter (D PA; μm), torus diameter (D TO; μm), torus-aperture overlap (O), and the water potential corresponding to 50 % loss of hydraulic conductivity (P 50, MPa) are given. Bold letters (a, b, c) indicate to what extent anatomical features are significantly different between organs within species. Anatomical data of roots of P. pinaster and P. menziesii were retrieved from Bouche et al. (2015)