Efficiency of indirect selection for green biomass production of <i>Urochloa ruziziensis</i>

Dias, Juliana Andrade; Rosado, Lucas Rodrigues; Benites, Flávio; Souza Sobrinho, Fausto; Nunes, Jose Airton Rodrigues; Gonçalves, Flavia Maria Avelar

doi:10.1590/1984-70332022v22n2a22

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Crop Breeding and Applied Biotechnology

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ARTICLE • Crop Breed. Appl. Biotechnol. 22 (2) • 2022 • https://doi.org/10.1590/1984-70332022v22n2a22 copy

Efficiency of indirect selection for green biomass production of Urochloa ruziziensis

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

We aimed to measure the efficiency of visual selection of plant vigor for green biomass production of U. ruziziensis using single- and multitrait approaches to maximize the predictive accuracy of the genetic value. The green biomass production and plant vigor of 254 U. ruziziensis clones were measured over nine evaluation cuttings to determine the efficiency of these approaches for production improvement. Individual and multicutting analyses were performed under single-trait and multitrait approaches using mixed models. The efficiency of visual selection was assessed by measuring plant vigor based on direct and indirect genetic gains. Plant vigor showed a high genetic association with green biomass and could be selected for production, especially in the initial phases of breeding programs. The multitrait approach was superior to the single-trait approach in predicting the genetic value of the clones, and it can be used in U. ruziziensis breeding programs.

Keywords:
Brachiaria ruziziensis; visual selection; mixed models; accuracy

Cuttings	Overall mean		Single-trait			Multitrait
	Overall mean		Green biomass	Vigor		Green biomass			Vigor
	GM	Vigor		h ²	${\hat{r}}_{g \tilde{g}}$	h ²	${\hat{r}}_{g \tilde{g}}$	h ²	${\hat{r}}_{g \tilde{g}}$	RE (%)	h ²	${\hat{r}}_{g \tilde{g}}$	RE (%)
1	1696.71	2.51	0.46	0.68	0.52	0.72	0.52	0.72	6.02	0.53	0.73	1.14
2	1087.64	3.12	0.55	0.74	0.69	0.83	0.65	0.80	8.21	0.69	0.83	0.09
3	1666.99	3.02	0.56	0.74	0.66	0.81	0.61	0.78	5.20	0.66	0.81	0.18
4	1124.88	2.72	0.53	0.72	0.62	0.79	0.58	0.76	5.47	0.62	0.78	-0.23
5	1153.98	2.67	0.56	0.75	0.61	0.78	0.59	0.77	2.07	0.62	0.79	0.30
6	1655.07	3.28	0.45	0.67	0.61	0.78	0.50	0.71	5.52	0.62	0.79	0.66
7	1759.34	3.18	0.23	0.48	0.49	0.70	0.42	0.65	35.96	0.50	0.71	1.10
8	1026.46	2.73	0.36	0.60	0.45	0.67	0.38	0.61	2.31	0.46	0.68	1.46
9	1186.12	3.06	0.29	0.54	0.56	0.74	0.43	0.66	21.63	0.56	0.75	0.31

Traits	Overall mean	$r_{g}$	$r_{e}$	Single-trait		Multitrait
Traits	Overall mean	$r_{g}$	$r_{e}$	h ²	${\hat{r}}_{g \tilde{g}}$	h ²	${\hat{r}}_{g \tilde{g}}$	RE (%)
GM	1373.70	0.96	0.54	0.63	0.80	0.76	0.87	8.47
Vigor	2.92	0.72	0.85	0.78	0.88	4.28

Genetic gain	Single-trait			Multitrait
	Direct		Indirect		Direct		Indirect
	GM	Vigor		GM		GM	Vigor	GM
GS	353.86	0.51		278.12		383.22	0.57	369.31
GS (%)	25.76	17.58		20.25		27.90	19.35	26.88

Correlation	GM-ST	Vigor-ST	GM-MT	Vigor-MT
GM-ST	1	0.87*	0.94*	0.90*
Vigor-ST	44	1	0.95*	0.98*
GM-MT	70	66	1	0.99*
Vigor-MT	44	83	74	1

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: avelar@ufla.br