Breeding strategies for tropical maize targeting <i>in vivo</i> haploid inducers

Ribeiro, Camila Bastos; Rezende, Breno Alvarenga; Bueno Filho, Júlio Sílvio de Sousa; Silva, Éder David Borges da; Dias, Kaio Olímpio das Graças; Nunes, José Airton Rodrigues; Carvalho, Pedro Laurence Silva; Mota, Suellen Finamor; Bustamante, Fernanda de Oliveira; Diniz, Rafael Parreira; Castro, Carlos Eduardo Caixeta de; Camargos, Renato Barbosa; Nascimento, Josiel; Souza, João Cândido de

doi:10.1590/1984-70332020v20n2a32

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ARTICLE • Crop Breed. Appl. Biotechnol. 20 (2) • Apr-Jun 2020 • https://doi.org/10.1590/1984-70332020v20n2a32 linkcopy

Breeding strategies for tropical maize targeting in vivo haploid inducers

Authorship SCIMAGO INSTITUTIONS RANKINGS

The objective of this study was to compare the selection of plants bred by different pedigree methods using selection among, among and within and only within families. The haploid induction rate of 14 S_0:1 and seven S_2:3 families, all crossed with the single-cross hybrid GNZ9501, was evaluated. An experimental area of the Department of Biology of the Federal University of Lavras (UFLA), in Lavras, Minas Gerais, in the growing seasons 2012/2013 and 2014/2015, was used for the experiments. In each growing season, one experiment per was carried out, arranged in a complete randomized design, with one and two replications, respectively. Haploid induction was most effective in the families 2 and 6 in both growing seasons. Selection among and within families resulted in higher genetic gains for haploid induction. The results indicated a high genetic variability for haploid induction rate in plants within families.

Keywords:
Zea mays; selection among and within family; haploid induction

HIR (%)
Family name	2012/2013	2014/2015	Family mean
1	0.86
2	2.3	0.74	1.52
3	2.5	0.34	1.42
4	0.88	0.52	0.7
6	7.92	2.71	5.32
7	1.56	0	0.78
8	1.76	1.53	1.65
9	2.5
10	0
13	0.61	0	0.31
15	0
18	1.16
20	0.3
21	0
Mean	1.60 (1.59-1.65^*)	0.84 (0.74-1.05)	1.67 (1.65-1.75)
Sample Size	92	148

	2012/2013
Factors	df	Deviance	h² (%)
Family	13	0.34*	9.37
Family x Plant	89	2.33
	2014/2015
Family	6	0.42*	11.33
Plant/Family	196	0.93*	22.04
Replication	1	0.0001
Family x Plant x Replication	142	6.57

	Genotypic value
Family	2012/2013	2014/2015
1	0.60
2	1.12	0.15
3	1.12	0.03
4	0.68	0.15
6	1.99	1.39
7	0.47	0.08
8	0.82	0.12
9	0.72
10	0.67
13	0.65	0.06
15	0.63
18	0.52
20	0.63
21	0.76
Mean	0.81	0.28

	2012/2013
Selection strategy	Selected families	GG
Among families (6 families)	6,2,3,8,21,9	0.005
Among and within families (12x1)¹	6,2,3,8,21,9,1,15,20,13,10,4	0.078
Among and within families (6x3)²	6,2,3,8,21,9	0.156
Within families (50% or 46 plants)		0.036
Within families (20% or 18 plants)		0.132
Within families (10% or 9 plants)		0.244
	2014/2015
Among families (6 families)	6,4,2,8,7,13	0.0001
Among and within families (6x1)³	6,4,2,8,7,13	0.024
Among and within - families (3x3)⁴	6,4,2	0.172
Within families (50% or 74 plants)		0.005
Within families (20% or 28 plants)		0.020
Within families (10% or 14 plants)		0.027

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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] ^* Mean confidence interval (95% probability).