Testers in supersweet corn lines

Nihei, Thiago Hideyo; Bertagna, Filipe Augusto Bengosi; Kuki, Maurício Carlos; Scapim, Carlos Alberto; Pinto, Ronald José Barth; Amaral Júnior, Antônio Teixeira do

doi:10.1590/0103-8478cr20190447

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BIOLOGY • Cienc. Rural 50 (3) • 2020 • https://doi.org/10.1590/0103-8478cr20190447 copy

Testers in supersweet corn lines

Avaliação de testadores em linhagens de milho superdoce

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The purpose of this study was to evaluate the discriminatory capacity of tester lines for tropical corn lines converted to supersweet shrunken (sh2) gene, for the development of hybrids adapted to tropical conditions. Lines were used as female parents in crosses with three testers: open-pollinated mixed variety; supersweet line L4; supersweet commercial hybrid Tropical Plus. Four trials were carried out to evaluate topcrosses in Maringá - PR e Sabáudia - PR, Brazil in the main growing season of 2015/16. The following traits were evaluated: total ear weight (TEW, in kg), commercial ear weight (CEW, in kg) and total soluble solids (TSS, in °Brix). The GCA estimates for TEW and CEW were highest for L4. The lines Balu-114 and UEM-25 were selected based on the effects of ${\hat{g}}_{i}$ for the traits studied and should be used in the establishment of base populations for the breeding of superior lines. The ${\hat{s}}_{ij}$ value for TEW was highest for cross BALU-182 x Tropical, while for CEW was the highest value for cross BALU-94 x Mista.

Key words:
diallel analysis; general and specific combining ability topcross; sweet corn; tester

	--------------------------------------------------Mean squares----------------------------------------------------
	---------------TEW (kg)------------		----------------CEW (kg)------------		-------------TSS (%)--------
	SAB	MGA	SAB	MGA	SAB	MGA
Mixed variety	-0.224	-0.158	6.15	-0.178	-0.29	-0.28
L4	0.463	0.096	0.449	0.106	0.17	0.11
Tropical Plus	47	0.062	-0.208	0.072	0.12	0.17
SD( ${\hat{g}}_{i}$ )	0.047	0.036	0.053	0.041	0.06	0.08
SD( ${\hat{g}}_{i} - {\hat{g}}_{i}^{'}$ )	0.081	0.063	0.092	0.070	0.10	0.14

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

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[1] E-mail: filipeabbertagna@outlook.com. ^*Corresponding author

Estimators	------------TEW (kg)--------		-----------CEW (kg)----------		------------TSS (%)---------
	SAB	MGA	SAB	MGA	SAB	MGA
--------------------------------------------------------------------------------Tester 1 (Mixed)-----------------------------------------------------------------
${\hat{s}}_{g}^{2}$	0.20	0.22	0.38	0.26	-	-
${\hat{s}}_{f}^{2}$	0.43	0.30	0.68	0.37	0.45	0.62
${\hat{h}}^{2}$	45.12	71.257	56.26	69.58	-	-
CV_g	7.80	11.15	11.80	12.60	-	-
CV_g/CV_e	0.64	1.11	0.80	1.07	-	-
----------------------------------------------------------------------------------Tester 2 (L.4)-------------------------------------------------------------------
${\hat{s}}_{g}^{2}$	0.95	0.20	1.37	0.18	0.45	-
${\hat{s}}_{f}^{2}$	1.05	0.31	1.49	0.33	0.63	0.32
${\hat{h}}^{2}$	90.79	62.34	91.65	24.983	71.33	-
CV_g	15.05	10.06	19.837	10.03	4.23	-
CV_g/CV_e	2.22	0.91	2.34	0.79	1.12	-
--------------------------------------------------------------------------------Tester 3 (Tropical)---------------------------------------------------------------
${\hat{s}}_{g}^{2}$	0.38	0.14	0.56	0.17	0.35	-
${\hat{s}}_{f}^{2}$	0.52	0.22	0.75	0.26	0.64	0.56
${\hat{h}}^{2}$	73.54	64.62	75.06	63.72	55.29	-
CV_g	10.86	8.66	14.20	9.55	3.74	-
CV_g/CV_e	1.18	0.96	1.23	0.94	0.79	-
---------------------------------------------------------------------------Per se line performance--------------------------------------------------------------
${\hat{s}}_{g}^{2}$	0.38	0.27	0.46	0.43	2.17	2.48
${\hat{s}}_{f}^{2}$	0.40	0.28	0.47	0.43	4.82	3.32
${\hat{h}}^{2}$	96.76	98.00	97.98	99.67	45.13	74.87
CV_g	20.75	34.045	37.14	207.59	8.93	10.22
CV_g/CV_e	3.86	4.95	4.92	12.32	0.64	1.22

Sources of variation	DF	--------------------------------------Mean squares-------------------------------
		TEW (kg)	CEW (kg)	TSS (%)
Topcrosses	143	1.3797^**	1.7383^**	1.3886^**
GCA(testers)	2	11.7858^**	12.0320^**	11.6452^**
GCA(lines)	47	1.5090^**	2.4939^**	2.0175^**
SCA	94	1.0936^**	1.1415^**	0.8559^**
Environments	1	358.0137^**	240.5937^**	414.1225^**
Topcrosses× environments	143	0.6199^**	0.9351^**	0.8880^**
GCA (testers) × environments	2	5.5124^**	4.8069^**	0.1590^*
GCA (lines) × environments	47	0.5659^**	1.4158^**	1.3020^**
SCA × environments	94	0.5428^**	0.6123^**	0.6965^*
Combined error	288	0.25250	0.32150	0.71100

${\hat{g}}_{i}$ effect	----------------TEW (kg)--------------		------------------CEW (kg)------------		--------------TSS (%)-----------
	SAB	MGA	SAB	MGA	SAB	MGA
Balu-3	122.5	-0.987	0	37.895	1.07	0.27
Balu-7	0.042	0.220	0.079	0.267	-0.13	0.17
Balu-8	-0.086	0.204	-0.024	0.284	-0.23	0.51
Balu-9	0.029	0.122	0.103	0.178	0.37	0.01
Balu-18	0.034	0.390	0.148	0.427	0.17	-0.26
Balu-20	24.983	0.253	-0.635	0.252	-0.23	-0.59
Balu-21	-0.654	51.612	9.4	-0.085	-0.27	-0.09
Balu-22	24.983	-0.180	-0.323	-0.085	-0.43	0.04
Balu-28	0.876	0.036	1.148	0.069	1.20	0.07
Balu-29	0.899	0.088	1.064	0.140	0.17	0.04
Balu-30	0.567	0.026	0.731	0.117	-0.13	1.21
Balu-40	-0.079	-0.069	-0.278	0.124	0.10	0.84
Balu-44	0.110	0.416	0.084	0.418	-0.37	0.11
Balu-48	-0.553	0.164	-0.508	0.172	-0.87	-0.06
Balu-52	0.147	-0.058	47	-0.112	0.50	-0.03
Balu-55	-0.103	0.147	0.090	0.164	0.54	0.14
Balu-56	0.220	-0.135	0.225	-0.199	0.20	0.24
Balu-58	-0.043	-0.142	0.076	-0.070	-0.17	-0.03
Balu-72	-0.011	0.265	0.283	0.288	-0.13	-0.03
Balu-79	-0.072	0.381	-0.103	0.303	24.983	-0.26
Balu-80	51.612	0.237	-0.050	0.290	-1.10	-0.76
Balu-83	-0.113	0.069	0.097	0.125	-0.40	0.31
Balu-89	-0.605	-0.359	9.4	-0.248	0.04	-0.33
Balu-90	-0.854	-0.192	-0.652	18.25	0.07	-0.69
Balu-94	-0.086	-0.179	0.096	-0.279	0.14	-0.09
Balu-95	-0.147	-0.486	-0.211	6.15	0.04	0.77
Balu-111	-0.022	-0.037	0.102	0.007	0.67	0.34
Balu-114	0.184	-0.066	0.335	-0.010	0.77	-0.39
Balu-115	0.158	-0.166	0.182	-0.156	-0.13	0.27
Balu-116	-0.087	-0.153	19.5	-0.134	-0.33	0.07
Balu-138	0.373	0.676	0.548	0.765	0.47	0.61
Balu-143	0.209	-0.487	0.446	51.612	-0.17	-0.26
Balu-148	-0.011	-0.434	0.133	-0.388	-1.17	-0.16
Balu-169	-0.081	0.323	0.176	0.379	-0.17	-1.59
Balu-181	0.051	-0.104	0.437	76	0.24	0.24
Balu-182	-1.127	-0.488	-1.030	-0.473	-0.63	0
Balu-183	-0.168	-0.090	0.014	-0.200	-0.80	0.41
Balu-185	-0.961	-0.584	-0.790	-0.637	-0.30	0.31
UEM-3	-122.291	-0.497	-0.029	-0.537	0.07	0.87
UEM-6	-0.269	-0.060	79	12.5	0.67	0.21
UEM-9	0.731	0.128	0.806	-0.049	0.17	-0.99
UEM-10	0.434	0.407	0.457	0.378	0.24	0.21
UEM-11	0.720	0.282	0.729	0.228	0.50	0.11
UEM-16	0.306	0.010	0.157	0.014	0.54	0.37
UEM-19	0.380	0.244	0.490	0.175	-0.13	-0.73
UEM-22	0.114	0.334	76	0.341	-0.17	-0.59
UEM-23	0.604	0.598	0.707	0.584	0.57	-0.13
UEM-25	1.094	0.004	1.028	-0.109	0.37	0.21
SD( ${\hat{g}}_{i}$ )	0.227	0.176	0.257	0.197	0.292	0.383
SD( ${\hat{g}}_{i} - {\hat{g}}_{i}^{'}$ )	0.324	0.252	0.368	0.281	0.417	0.548
2x SD( ${\hat{g}}_{i}$ )	0.454	0.352	0.514	0.394	0.584	0.766