Using of relatedness and heritability in a <i>Eucalyptus benthamii</i> trial for conservation and breeding

Souza, Bruno Marchetti de; Abreu, Lucas Moura de; Pappas, Marilia de Castro Rodrigues; Azevedo, Vânia; Santos, Paulo Eduardo Telles dos; Sousa, Valderes Aparecida de; Santos, Rodrigo Furtado dos; Lopes, Maria Teresa Gomes; Aguiar, Ananda Virginia

doi:10.1590/1984-70332023v23n4a43

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Crop Breeding and Applied Biotechnology

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ARTICLE • Crop Breed. Appl. Biotechnol. 23 (4) • 2023 • https://doi.org/10.1590/1984-70332023v23n4a43 copy

Using of relatedness and heritability in a Eucalyptus benthamii trial for conservation and breeding

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

We evaluated the genetic diversity, coancestry and heritability of an E. benthamii trial. The 115 individuals were genotyped (13 SSR) and had their height and diameter at breast height (dbh) measured. Heritability was estimated using the RR-BLUP and the pairwise kinship coefficient method. An average of nine alleles per locus was observed. The expected heterozygosity (0.655) was similar to the observed heterozygosity, with the estimated inbreeding (0.02) being low. The group coancestry (0.051) demonstrates that the trees are related to some degree. The trees were clustered in five groups using the Evanno’s method. The average kinship within each group ranges from 0.042 to 0.082. The heritability estimated by RR-BLUP was low. The heritability estimated using the kinship coefficients is moderate, reaching estimated genetic gains of 14% for dbh. After knowing how genetic groups are distributed within the population, strategies for collecting, conserving, and using these germplasm resources can be performed.

Keywords:
Clustering method; frost-tolerant; inbreeding; kinship

Locus	n	$H_{o}$	$H_{e}$	$F$
eg61	6	0.342	0.352	0.023
embra06	14	0.613	0.834	0.262
embra10	12	0.567	0.734	0.225
embra11	14	0.790	0.653	-0.214
eg126	5	0.664	0.575	-0.159
eg67	17	0.785	0.859	0.082
es157	7	0.624	0.726	0.137
eg91	8	0.670	0.692	0.028
en06	9	0.761	0.681	-0.123
eg99	10	0.781	0.790	0.006
es140	8	0.455	0.448	-0.023
eg128	3	0.639	0.650	0.011
eg84	9	0.700	0.732	0.038
Mean	9.38	0.645	0.671	0.023

	Average kinship		Phenotypic mean per cluster
	Within cluster	Cross-clusters	Rank	Cluster	DBH (cm)	Cluster	Height (m)
C1	0.082	0.008	1	C3	1.99	C4	44.13
C2	0.062	0.009	2	C4	1.83	C2	43.04
C3	0.046	0.011	3	C2	1.77	C3	42.50
C4	0.042	0.010	4	C5	1.68	C1	41.52
C5	0.046	0.011	5	C1	1.65	C5	40.67
Trait	$σ_{a}^{2}$	$σ_{y}^{2}$	$σ_{e}^{2}$	$h_{2}$	<mml:math><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>e</mml:mi></mml:mrow></mml:msub></mml:math>	$θ_{x y}$	$h_{2}'$
dbh	3.17	104.02	100.85	0.03			0.22
Height	0.35	23.00	22.00	0.02			0.17
Population					9.80	0.051

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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[1] * E-mail: mtglopes@hotmail.com