Imidazolinone resistance, yield potential and agronomic performance of the irrigated rice cultivar BRS A706 CL

Cultivar BRS A706 CL is a new rice cultivar, resistant to herbicides of the chemical group of imidazolinones, with a yield potential of 15,635 kg ha^-1. It has intermediate maturation, lodging tolerance, the stay green trait, moderate rice blast resistance, a high milling yield and premium grain quality.

KEYWORDS:
Oryza sativa L.; herbicide resistance; grain yield; breeding; clearfield® production system

Authorship

Paulo Hideo Nakano Rangel ^** E-mail: paulo.hideo@embrapa.br

Embrapa Arroz e Feijão, Rodovia GO 462, km 12, Zona Rural, 73575-000, Santo Antônio de Goiás, GO, Brazil. Embrapa Arroz e FeijãoBrazilSanto Antônio de Goiás, GO, Brazil Embrapa Arroz e Feijão, Rodovia GO 462, km 12, Zona Rural, 73575-000, Santo Antônio de Goiás, GO, Brazil.

https://orcid.org/0000-0002-5741-3426

José Manoel Colombari-Filho

Marcio Elias Ferreira

Embrapa Recursos Genéticos e Biotecnologia, Avenida W5 Norte, Parque Estação Biológica, 70770-917, Brasília, DF, BrazilEmbrapa Recursos Genéticos e BiotecnologiaBrazilBrasília, DF, Brazil Embrapa Recursos Genéticos e Biotecnologia, Avenida W5 Norte, Parque Estação Biológica, 70770-917, Brasília, DF, Brazil

Ariano Martins de Magalhães Junior

Embrapa Clima Temperado, Rodovia BR 32, km 78, Monte Bonito, 96010-971, Pelotas, RS, BrazilEmbrapa Clima TemperadoBrazilPelotas, RS, Brazil Embrapa Clima Temperado, Rodovia BR 32, km 78, Monte Bonito, 96010-971, Pelotas, RS, Brazil

Guilherme Barbosa Abreu

Embrapa Cocais, Avenida São Luís Rei de França, 4, Turu, 65067-205, São Luís, MA, BrazilEmbrapa CocaisBrazilSão Luís, MA, Brazil Embrapa Cocais, Avenida São Luís Rei de França, 4, Turu, 65067-205, São Luís, MA, Brazil

José Almeida Pereira

Embrapa Meio Norte, Avenida Duque de Caxias, 5650, Buenos Aires, 64008-780, Teresina, PI, BrazilEmbrapa Meio NorteBrazilTeresina, PI, Brazil Embrapa Meio Norte, Avenida Duque de Caxias, 5650, Buenos Aires, 64008-780, Teresina, PI, Brazil

Antônio Carlos Centeno Cordeiro

Embrapa Roraima, Rodovia BR 174, km 8, Distrito Industrial, 69301-970, Boa Vista, RR, BrazilEmbrapa RoraimaBrazilBoa Vista, RR, Brazil Embrapa Roraima, Rodovia BR 174, km 8, Distrito Industrial, 69301-970, Boa Vista, RR, Brazil

Daniel Brito Fragoso

Embrapa Pesca e Aquicultura, Avenida NS 10, cruzamento com Avenida LO 18, Água Fria, 77008-900, Palmas, TO, BrazilEmbrapa Pesca e AquiculturaBrazilPalmas, TO, Brazil Embrapa Pesca e Aquicultura, Avenida NS 10, cruzamento com Avenida LO 18, Água Fria, 77008-900, Palmas, TO, Brazil

Isabela Volpi Furtini

Embrapa Agrossilvipastoril, Rodovia MT 222, km 2,5, Zona Rural, 7550-970, Sinop, MT, BrazilEmbrapa AgrossilvipastorilBrazilSinop, MT, Brazil Embrapa Agrossilvipastoril, Rodovia MT 222, km 2,5, Zona Rural, 7550-970, Sinop, MT, Brazil

Paulo Ricardo Reis Fagundes

Mábio Chrisley Lacerda

Embrapa Arroz e Feijão, Escritório Técnico, Rodovia GO 462, 74230-045, Goiânia, GO, BrazilEmbrapa Arroz e FeijãoBrazilGoiânia, GO, Brazil Embrapa Arroz e Feijão, Escritório Técnico, Rodovia GO 462, 74230-045, Goiânia, GO, Brazil

Carlos Martins Santiago

Adriano Pereira de Castro

^* E-mail: paulo.hideo@embrapa.br

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables

Figures (2)
Tables (1)

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Figure 1. Development
of cv BRS A706 CL. Cultivar BRS Catiana was used as recurrent parent in the backcross program. The imidazolinone resistance gene was introgressed from cv Puitá INTA-CL, used as donor parent. Sources of blast resistance are highlighted in yellow (Cica 4, Cica 8, Colombia 1, IR 665, Metica 1, Peta, Tadukan and Tetep).

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Figure 2
Mean grain yield (kg ha^-1) of cv BRS A706 CL and controls, in the trials of Value for Cultivation and Use (VCU) in the growing seasons of 2017/18 (15 locations), 2018/19 (17 locations) and 2020/21 (8 locations), in the States of Goiás, Maranhão, Piauí, Rio Grande do Sul, Roraima and Tocantins. Within each cluster, means followed by the same letter do not differ significantly by the Tukey test, at 5% probability.

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Table 1
Agronomic performance of BRS A706 CL and controls: 1) Means of agronomic traits in the trials of Value for Cultivation and Use (VCU) in the growing seasons of 2017/18 (15 locations), 2018/19 (17 locations), and 2020/ 21 (8 locations), in Goiás, Maranhão, Piauí, Rio Grande do Sul, Roraima and Tocantins. 2) Resistance to blast: means of leaf blast recorded in the VNB (Viveiro Nacional de Brusone) trials, carried out in 40 environments, in the 2017/18, 2018/19 and 2020/21 growing seasons. 3) Means of grain quality parameters recorded in VCU trials in the 2020/21 growing season, in Goiás and Tocantins; and in the VNQ (National Grain Quality Nursery) trials, at the Experimental Station Fazenda Palmital, Embrapa Rice and Beans, Goianira/GO, in the 2018/19 and 2020/21 growing seasons

Figure 1. Development of cv BRS A706 CL. Cultivar BRS Catiana was used as recurrent parent in the backcross program. The imidazolinone resistance gene was introgressed from cv Puitá INTA-CL, used as donor parent. Sources of blast resistance are highlighted in yellow (Cica 4, Cica 8, Colombia 1, IR 665, Metica 1, Peta, Tadukan and Tetep).

Figure 2 Mean grain yield (kg ha^-1) of cv BRS A706 CL and controls, in the trials of Value for Cultivation and Use (VCU) in the growing seasons of 2017/18 (15 locations), 2018/19 (17 locations) and 2020/21 (8 locations), in the States of Goiás, Maranhão, Piauí, Rio Grande do Sul, Roraima and Tocantins. Within each cluster, means followed by the same letter do not differ significantly by the Tukey test, at 5% probability.

Table 1 Agronomic performance of BRS A706 CL and controls: 1) Means of agronomic traits in the trials of Value for Cultivation and Use (VCU) in the growing seasons of 2017/18 (15 locations), 2018/19 (17 locations), and 2020/ 21 (8 locations), in Goiás, Maranhão, Piauí, Rio Grande do Sul, Roraima and Tocantins. 2) Resistance to blast: means of leaf blast recorded in the VNB (Viveiro Nacional de Brusone) trials, carried out in 40 environments, in the 2017/18, 2018/19 and 2020/21 growing seasons. 3) Means of grain quality parameters recorded in VCU trials in the 2020/21 growing season, in Goiás and Tocantins; and in the VNQ (National Grain Quality Nursery) trials, at the Experimental Station Fazenda Palmital, Embrapa Rice and Beans, Goianira/GO, in the 2018/19 and 2020/21 growing seasons

Cultivars	1) VCU - Agronomic traits								2) Resistance to rice blast			3) Grain quality
Cultivars	DF	PH	LO	LB	NB	BS_P	ESC	GS_P	¹M	¹MSc	¹F≤3 (%)	L	W	L/W	CHI	WGY	AAC	GT
BRS A706 CL	96	99	1.0	2.1	2.2	2.2	2.1	2.2	2.35	8.00	76	7.24	1.88	3.84	12.9	66.8	23.9(I)	7(B)
BRS Catiana	96	97	1.0	2.2	1.9	2.0	2.2	2.1	2.45	7.00	70	-	-	-	-	-	-	-
BRS Pampeira	96	102	1.2	2.1	2.1	1.9	2.2	2.0	2.21	8.00	72	7.13	1.94	3.68	12.9	67.5	23.0(I)	7(B)
IRGA 424 RI	96	102	1.2	2.1	2.1	1.9	2.2	2.0	3.47	9.00	53	6.67	1.96	3.41	15.5	67.8	24.9(I)	7(B)

Agronomic Traits: DF: days to flowering (days); PH: plant height (cm); LO: lodging (scores from 1 “all plants upright” to 9 “all plants bent over”); and LB, NB, BSp, ESC and GSp: reaction to leaf and neck blast, brown spot, leaf scald and grain spot, respectively (scores from 1 “absence or low disease symptoms” to 9 “very high disease symptoms”). Blast resistance: means (M), maximum scores (MSc) and frequencies of scores ≤3 (F≤3) of leaf blast. ¹Scores from 0 to 9, with 0 for plots with “no symptoms” and 9 for plots with “disease symptoms on more than 50% of the leaf area” (Pinheiro et al. 2009Pinheiro PV, Lopes Junior S, Oliveira JP, Guimarães CM, Stone LF, Madari BE, Filippi MCC, Pereira HS, Eifert EC, Silva JFA, Wendland A, Murillo Lobo Junior M, Ferreira EPB2009 Variáveis experimentais da Embrapa Arroz e Feijão. Embrapa Arroz e Feijão, Santo Antônio de Goiás , 80p). Grain Quality: L, W and L/W: grain length (L) and width (W) and L/W ratio, respectively; CHI: chalkiness index (%); WGY: percentage of whole grains (%); AAC: apparent amylose content (%, I “intermediate”); GT: gelatinization temperature (scores, B “low”).

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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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