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Table 2 Across-trial estimates of variances, narrow-sense individual heritability, narrow-sense family heritability, type B genetic correlation, relative expected genetic gain by selecting the top 1%, standard error (between parentheses), and relative magnitudea [between brackets, %] for wood density traits estimated at year 24 from progeny trials in the mixed and boreal forests

From: Rapid assessment of wood traits for large-scale breeding selection in Picea mariana [Mill.] B.S.P.

Vegetation subzone

Mixed forest

Boreal forest

Parameter

WD vol

WD pil

WD res

WD vol

WD pil

WD res

\( {\widehat{\sigma}}_F^2 \)

78.45b

0.28b

1.37b

88.07b

0.16b

1.11

(24.45)

(0.11)

(0.57)

(27.55)

(0.06)

(0.69)

[6.9]

[5.8]

[5.6]

[8.0]

[5.3]

[3.6]

\( {\widehat{\sigma}}_{S\ast F}^2 \)

0

0.07

0.51

3.93

0

0.38

 

(0.10)

(0.53)

(19.87)

 

(0.77)

[0]

[1.5]

[2.1]

[0.4]

[0]

[1.2]

\( {\widehat{\sigma}}_{\varepsilon}^2 \)

1062.20b

4.42b

22.43b

1008.00b

2.84b

29.44b

(45.31)

(0.19)

(0.98)

(43.99)

(0.12)

(1.44)

[93.1]

[92.7]

[92.3]

[91.6]

[94.7]

[95.2]

\( {\widehat{h}}_{ind}^2 \)

0.28

0.23

0.23

0.32

0.21

0.14

(0.08)

(0.09)

(0.09)

(0.09)

(0.07)

(0.09)

\( {\widehat{h}}_{\; fam}^2 \)

0.59

0.52

0.49

0.62

0.52

0.34

(0.08)

(0.13)

(0.13)

(0.10)

(0.09)

(0.16)

\( {\widehat{r}}_B \)

1b

0.80b

0.73b

0.96b

1b

0.74

(0)

(0.26)

(0.25)

(0.21)

(0)

(0.46)

\( {\widehat{G}}_{1\%} \)

5.32

5.50

13.81

5.70

4.65

8.37

  1. \( {\widehat{\sigma}}_F^2 \) Among-family variance component estimate, \( {\widehat{\sigma}}_{S\ast F}^2 \) site × family interaction variance component estimate, \( {\widehat{\sigma}}_{\varepsilon}^2 \) residual variance estimate due to among-plot variation, \( {\widehat{h}}_{ind}^2 \) unbiased individual-tree narrow-sense heritability, \( {\widehat{h}}_{\; fam}^2 \) unbiased half-sib narrow-sense heritability, \( {\widehat{r}}_B \) type B genetic correlation, \( {\widehat{G}}_{1\%} \) relative expected genetic gain by selecting the top 1% expressed as a percentage, WD vol volumetric wood density, WD pil Pilodyn wood density, WD res Resistograph® wood density
  2. aPercentage of each estimated variance component to total (phenotypic) variance \( \left({\widehat{\sigma}}_p^2={\widehat{\sigma}}_F^2+{\widehat{\sigma}}_{S\ast F}^2+{\widehat{\sigma}}_{\varepsilon}^2\right) \)
  3. bSignificantly different from 0 (for \( {\widehat{r}}_B \)) or significantly positive (for variance estimates) at the 5% significance level.