Genetic parameters and predicted gains with selection of interspecific hybrids of <i>Paspalum</i> for seed production

Lopes, Rodrigo Ramos; Franke, Lucia Brandão; Souza, Cléber Henrique Lopes de; Bertoncelli, Patrícia; Graminho, Larissa Arnhold; Pereira, Émerson André

doi:10.1590/1984-70332018v18n3a42

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Crop Breeding and Applied Biotechnology

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ARTICLE • Crop Breed. Appl. Biotechnol. 18 (03) • Sept 2018 • https://doi.org/10.1590/1984-70332018v18n3a42 copy

Genetic parameters and predicted gains with selection of interspecific hybrids of Paspalum for seed production

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The aim of this study was to estimate the genetic parameters and predicted gains with selection of interspecific hybrids of Paspalum in relation to seed production traits Data were analyzed in randomized block design, with 23 genotypes arranged into ten blocks, according to the methodology of mixed models by the REML/BLUP procedure. The traits considered in the study were: number of total tillers/plant, number of reproductive tillers/plant, number of racemes/inflorescence, number of seeds/inflorescence, weight of a thousand seeds and seed production. Variability among genotypes, high heritability (>0.50), except total tillers (0.44) and number of racemes (0.36), and high accuracy (>0.90) were identified for all traits. The hybrids 10E5052, 10E4026, 10E507, 10E4025 and 10E40104 are among the top ten because they have high genetic values in three or more traits, indicating that these genotypes should be recommended for direct use in planting or potential parents to be used in new crosses.

Keys words:
Paspalum plicatulum; Paspalum lepton; REML/BLUP; heritability; selective accuracy

Parameters¹	TT	RT	NRI	NSI	WTS	SP
LRT _Genotype (χ²)	195.46^**	215.67^**	140.44^**	418.41^**	542.03^**	239.32^**
LRT _Plot (χ²)	0.00	0.00	0.01	0.00	0.00	0.00
F _(Block)	44.53^††	17.53^††	2.45	3.41^††	0.57	39.41^††
${\hat{σ}}_{g}^{2}$	338.33	364.02	0.30	1207.29	0.21	271.93
${\hat{σ}}_{e}^{2}$	1.60	1.30	2.10^-3	2.40	2.10^-4	0.91
${\hat{σ}}_{p}^{2}$	767.99	688.06	0.84	1651.54	0.25	532.97
${\hat{σ}}_{r e s}^{2}$	428.06	322.74	0.54	441.86	0.04	260.13
$h_{g}^{2}$	0.44±0.09	0.53±0.09	0.36±0.08	0.73±0.11	0.84±0.12	0.51±0.09
CV_g (%)	11.61	15,91	9.17	18.25	12.59	25,78
CV_res (%)	13.06	14,98	12.31	11.04	5.49	25,22
CV_r	0.89	1,06	0.75	1.65	2.29	1,02
Acgen	94.20	95.84	92.03	98.21	99.05	95.52
Overall mean ( $\bar{X}$ )	158.43	119.94	5.97	190.39	3.64	63.96

	TT (number plant^-1)						RT (number plant^-1)
Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$	Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$
1	10E5052	33.5	192.0	33.5	192	1	10E5052	28.4	148.4	28.5	148
2	10E50150	25.8	184.2	29.7	188	2	10E40104	27.0	147.0	27.7	148
3	10E40104	21.6	180.0	27.0	185	3	10E4025	18.5	138.5	24.7	145
4	10E6047	18.3	176.8	24.8	183	4	10E5017	17.4	137.3	22.8	143
5	10E608	16.9	175.4	23.2	182	5	10E507	14.0	134.0	21.1	141
6	10E5017	15.7	174.0	22.0	180	6	10E6047	12.4	132.4	19.6	140
7	10E4026	15.6	174.0	21.1	180	7	10E402	10.2	130.1	18.3	138
8	10E6086	8.8	167.2	19.5	178	8	10E5023	10.0	129.9	17.3	137
9	10E507	8.6	166.1	18.3	177	9	10E6088	8.1	128.0	16.2	136
10	10E4025	1.6	160.1	16.6	175	10	10E6069	6.6	126.5	15.3	135
	NRI (number inflorescence^-1)						NSI (number inflorescence^-1)
Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$	Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$
1	10E4026	1.3	7.3	1.3	7.3	1	10E5052	96.0	286.4	96.0	286
2	10E4039	0.9	6.9	1.1	7.1	2	10E4071	55.9	256.3	76.0	266
3	10E6088	0.6	6.6	0.9	6.9	3	10E4026	53.2	243.6	68.4	259
4	10E6058	0.6	6.6	0.9	6.8	4	10E6024	46.1	236.5	62.8	253
5	10E6024	0.3	6.3	0.8	6.7	5	10E507	14.4	204.8	53.1	244
6	10E6047	0.3	6.2	0.7	6.6	6	10E6086	12.7	203.1	46.4	237
7	10E4076	0.2	6.2	0.6	6.6	7	10E4099	4.1	194.5	40.4	231
8	10E4077	0.2	6.2	0.6	6.6	8	10E40104	3.3	193.7	35.7	226
9	10E507	0.2	6.1	0.5	6.5	9	10E4025	1.3	191.7	31.9	222
10	10E50150	0.1	6.0	0.5	6.4	10	10E4076	-1.4	189.0	28.6	219
	WTS (g)						SP (g plant^-1)
Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$	Order	Genotype	g	u+g	gain	${\bar{X}}_{n e w}$
1	10E4077	1.0	4.7	1.0	4.7	1	10E4071	28.3	92.3	28.3	92
2	10E40177	0.8	4.5	0.9	4.6	2	10E5052	24.9	88.8	26.6	91
3	10E6088	0.7	4.3	0.8	4.5	3	10E4026	21.9	85.8	25.0	89
4	10E6084	0.4	4.1	0.7	4.4	4	10E507	18.6	82.6	23.4	87
5	10E507	0.3	3.9	0.6	4.3	5	10E4025	17.9	81.9	22.3	86
6	10E40104	0.3	3.9	0.6	4.2	6	10E6086	12.1	76.1	20.6	85
7	10E5017	0.1	3.8	0.5	4.2	7	10E40104	10.6	74.5	19.2	83
8	10E4025	0.1	3.7	0.5	4.1	8	10E5017	6.4	70.4	17.6	82
9	10E6047	0.1	3.7	0.4	4.1	9	10E4077	6.0	69.9	16.3	80
10	10E4039	0.1	3.7	0.4	4.0	10	10E6084	1.8	65.7	14.8	79

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