Inheritance and genetic correlations of <i>Corymbia citriodora</i> wood property traits

Longui, Eduardo Luiz; Lima, Israel Luiz de; Vieira, Willyam de Lima; Ranzini, Maurício; Machado, José Arimateia Rabelo; Freitas, Miguel Luiz Menezes; Ballarin, Adriano Wagner; Sebbenn, Alexandre Magno

doi:10.1590/1984-70332025v25n3a43

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ARTICLE • Crop Breed. Appl. Biotechnol. 25 (3) • 2025 • https://doi.org/10.1590/1984-70332025v25n3a43 linkcopy

Inheritance and genetic correlations of Corymbia citriodora wood property traits

Authorship SCIMAGO INSTITUTIONS RANKINGS

Physical and mechanical properties of wood, such as basic density (ρ_bas), volumetric shrinkage (β_v), compressive strength (f_c0), modulus of elasticity (MOE) and modulus of rupture (MOR) were evaluated in near-pith (PI), intermediate (MI) and near-bark (BA) planks from a 33-year-old Corymbia citriodora progeny test, planted in Luiz Antônio, São Paulo, Brazil. These properties were assessed to support simultaneous breeding of multiple traits. All wood properties increased radially from PI to BA. Genetic variation among families was observed for ρ_bas at the averaged and BA radial positions. Moderate positive additive genetic correlations were found between ρ_bas×f_c0, ρ_bas × MOE, ρ_bas × MOR, β_v × f_c0, β_v × MOE, β_v × MOR, f_c0 × MOE, f_c0 × MOR, and MOE × MOR. These findings indicate the potential for simultaneous genetic improvement of multiple traits, with ρ_bas serving as a key trait for direct selection to achieve indirect genetic gains in other properties.

Keywords:
Quantitative genetics; tree breeding; wood quality; physical properties; mechanical properties

Statistics	PI	MI	BA	Average
Mean
Wood basic density (ρ_bas, g.cm^-3)	0.658a	0.741b	0.785c*	0.728*
Volumetric shrinkage (β_v, %)	14.4a	14.9a	16.6b	15.3
Compression strength (f_c0, MPa)	49.3a	62.0b	67.2c	59.5
Modulus of elasticity (MOE, MPa)	11436a	14361b	18492c	14763
Modulus of rupture (MOR, MPa)	87.1a	113.6b	134.05c	111.6
Genetic variation coefficient ( $C V_{g} %$ )
Wood basic density (ρ_bas)	3.9	2.9	2.5	2.7
Volumetric shrinkage (β_v)	2.0	1.6	1.9	1.4
Compression strength (f_c0)	4.8	3.8	3.3	3.0
Modulus of elasticity (MOE)	5.9	4.8	3.5	3.2
Modulus of rupture (MOR)	6.2	4.7	3.5	4.5
Relative variation coefficient ( $C V_{r}$ )
Wood basic density (ρ_bas)	0.5	0.46	0.48	0.49
Volumetric shrinkage (β_v)	0.30	0.30	0.32	0.31
Compression strength (f_c0)	0.32	0.31	0.31	0.31
Modulus of elasticity (MOE)	0.31	0.32	0.31	0.32
Modulus of rupture (MOR)	0.31	0.33	0.32	0.33
Family-mean heritability ( $h_{m}^{2}$ )
Wood basic density (ρ_bas)	0.428	0.391	0.425	0.417
Volumetric shrinkage (β_v)	0.209	0.217	0.231	0.226
Compression strength (f_c0)	0.235	0.233	0.228	0.225
Modulus of elasticity (MOE)	0.228	0.232	0.226	0.231
Modulus of rupture (MOR)	0.223	0.244	0.233	0.249

	β_v	f_c0	MOE	MOR
ρ_bas	0.39	0.62**	0.65**	0.59**
β_v		0.51*	0.53*	0.61**
f_c0			0.63**	0.74**
MOE				0.75**

Traits	${P G}_{g} %$	${I P G}_{g} %$
Wood basic density (ρ_bas)	5.2	-
Compression strength (f_c0)	4.3	3.6
Modulus of elasticity (MOE)	4.7	4.1
Modulus of rupture (MOR)	6.8	5.2

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Crop Breeding and Applied Biotechnology Universidade Federal de Viçosa, Departamento de Fitotecnia, 36570-000 Viçosa - Minas Gerais/Brasil, Tel.: (55 31)3899-2611, Fax: (55 31)3899-2611 - Viçosa - MG - Brazil
E-mail: cbab@ufv.br

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[TFN1] * P< 0.05, with 0.5 degrees of freedom for likelihood ratio test (LRT),

$χ^{2}$

deviance chi-square; Different letters (a, b, and c) indicate significant differences (P< 0.05) by Tukey's test between the radial positions PI, MI, and BA.