Predicted genetic gains for growth traits and Genotype x Environment interaction in <i>Pinus greggii</i>: new perspectives for genetic improvement in Brazil

MUNHOZ, LEONARDO V.; BIERNASKI, FABRICIO A.; PERES, FABIANA S.B.; DIAS, ANDREA N.; TAMBARUSSI, EVANDRO V.

doi:10.1590/0001-3765202120201486

home Sumário navigate_before Anterior Atual Seguinte navigate_next

home Sumário

FORESTRY SCIENCE • An. Acad. Bras. Ciênc. 93 (suppl 3) • 2021 • https://doi.org/10.1590/0001-3765202120201486 linkcopy

Predicted genetic gains for growth traits and Genotype x Environment interaction in Pinus greggii: new perspectives for genetic improvement in Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Pinus greggii has potential for inclusion in temperate zone breeding programs around the world as it is frost resistant and produces high yields for pulp production. This study estimates the genetic parameters for two P. greggii progeny tests established in Telêmaco Borba, Paraná, Brazil. We evaluated diameter at breast height (DBH) and total height (H) at seven and nine years of age. The narrow-sense heritability ( $h_{i}^{2}$ ) ranged from 0.225 (H, 7 years) to 0.515 (H, 9 years). The genetic correlation was high for all traits, reaching up to 0.91 between traits and 0.94 between ages. In addition, the results show the presence of Genotype x Environment interaction, and as such, the most productive and stable progeny were identified based on the Harmonic Mean of the Relative Performance of Genetic Values (MHPRVG) values. These population has genetic materials that are superior in terms of both DBH and H compared to the control and to P. greggii materials analyzed internationally. Our results contribute to the literature by providing further genetic information on this species, while also demonstrating the implications of thinning for genetic gains and effective population size.

Key words
Effective size; genetic correlation; MHPRVG; tree breeding

Experiment	Latitude (S)	Longitude (W)	Soil type
PGI	24°12’50’’	50°32’13’’	Dystrophic Red Latosol, clayey and very clayey texture
PGII	24°11’12’’	50°32’14’’	Haplic Cambisol, medium texture

Experiments		DBH7	H7	DBH9	H9
PGI	LRT Progeny	26.07**	20.65**	25.85**	31.96**
PGII	LRT Progeny	24.79*	12.53**	29.45**	16.88**

	7 years				9 years
	PGI		PGII		PGI		PGII
	DBH	H	DBH	H	DBH	H	DBH	H
$h_{i}^{2}$ (SE)	0.317 (0.11)	0.500 (0.12)	0.311 (0.06)	0.225 (0.09)	0.350 (0.11)	0.515 (0.12)	0.351 (0.07)	0.320 (0.08)
$h_{d}^{2}$	0.277	0.498	0.251	0.192	0.311	0.498	0.290	0.280
$h_{m}^{2}$	0.790	0.821	0.822	0.738	0.821	0.850	0.846	0.774
$H^{2}$	0.212	0.263	0.266	0.217	0.328	0.381	0.324	0.386
${𝐶 𝑉}_{g} (%)$	6.7	7.0	8.2	7.0	7.7	6.6	9.6	5.4
${𝐶 𝑉}_{𝑔 𝑖} (%)$	13.3	13.9	16.3	13.9	15.4	13.2	19.1	10.7
${𝐶 𝑉}_{e} (%)$	22.1	17.1	28.1	28.0	24.5	16.4	30.8	17.6
$\hat{b}$	0.30	0.41	0.29	0.25	0.31	0.40	0.29	0.31
${𝐶 𝑉}_{𝑔 𝑖} / {𝐶 𝑉}_{g}$	2.00	2.00	2.00	2.00	2.00	2.00	2.00	2.00
$r_{𝑎 𝑎}$	0.56	0.70	0.50	0.47	0.59	0.72	0.59	0.56
Mean	14.1	12.5	12.8	12.0	15.6	13.5	14.3	12.9

	PGI			PGII
Rank	Progeny	BLUP	New Mean	Progeny	BLUP	New Mean
1	192	1.5914	17.60	30	1.7319	16.36
2	194	1.4456	17.06	35	1.5391	15.81
3	35	0.9574	16.58	P. taeda	1.2870	15.55
4	187	0.7994	16.42	187	1.2107	15.48
5	193	0.6001	16.22	192	0.7941	15.06
6	172	0.5404	16.16	33	0.4002	14.67
7	P. taeda	0.5240	16.14	194	0.3581	14.63
8	173	0.4084	16.03	172	0.0602	14.33
9	184	-0.0549	15.56	193	0.0600	14.33
10	33	-0.1404	15.48	173	0.0335	14.30
11	30	-0.1874	15.43	190	-0.0268	14.24
12	185	-0.4781	15.14	185	-0.6415	13.63
13	190	-0.7214	14.90	184	-1.0570	13.21
14	186	-1.7267	13.89	186	-1.2845	12.98
15	24	-1.7516	13.87	183	-1.9605	12.31
16	183	-1.8064	13.81	24	-2.5045	11.76

Traits	DBH7	H7	DBH9	H9
DBH7	0.30*	0.87*	0.78*	0.67*
H7	0.91*	0.33*	0.80*	0.81*
DBH9	0.94*	0.88*	0.42*	0.91*
H9	0.59*	0.66*	0.67*	0.56*

Rank	Progeny	MHVG	PRVG	MHPRVG
1	35	16.30	16.33	16.33
2	192	16.24	16.28	16.28
3	187	16.03	16.06	16.06
4	P. taeda	15.91	15.94	15.94
5	194	15.90	15.94	15.94
6	30	15.74	15.77	15.77
7	193	15.28	15.32	15.32
8	172	15.25	15.29	15.29
9	173	15.16	15.20	15.20
10	33	15.06	15.09	15.09
11	190	14.52	14.55	14.55
12	184	14.29	14.33	14.33
13	185	14.29	14.33	14.33
14	186	13.26	13.29	13.29
15	183	12.83	12.87	12.87
16	24	12.52	12.56	12.56

	PGI			PGII
	Mean	$N_{e}$	_GAM%	Mean	$N_{e}$	_GAM%
Original	15.62	59.82	-	14.27	59.84	-
Seed Orchard	20.00	48.00	12.49	19.33	48.00	15.03
Positive BLUPs	21.04	24.00	15.93	20.18	30.00	19.18

vertical_align_top show_chart

more_horiz close
- image
- translate
- link
- article
- vertical_align_top
- file_download
- show_chart
- image
- translate
- link
- article

location_on

Academia Brasileira de Ciências Rua Anfilófio de Carvalho, 29, 3º andar, 20030-060 Rio de Janeiro RJ Brasil, Tel: +55 21 3907-8100 - Rio de Janeiro - RJ - Brazil
E-mail: aabc@abc.org.br

rss_feed Acompanhe os números deste periódico no seu leitor de RSS

[tfn2] LRT Progeny: progeny likelihood ratio test; LRT Plot: plot likelihood ratio test; **: significant at 0.1% probability; *significant at 1% probability