Development of blast resistant somaclones of the upland rice cultivar araguaia

Araújo, Leila Garcês de; Prabhu, A. S.; Freire, Adelson de Barros

doi:10.1590/s0100-204x2000000200015

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…First, one of the main goals in Italian rice breeding has always been to select varieties with genetic resistance to neck blast disease; second, after 1990 in Italy were introduced varieties from the US with good blast disease resistance, that were integrated in rice breeding programs (Faivre-Rampant et al 2011); third, cultivars registered in National list in 1967 (the year of constitution of the official National list) were actually selected between 1920 and 1940 (Tamborini et al 2008) and in almost a century of cultivation the pathogen could have overcome host resistance. Moreover, the ability of the fungus to mutate and quickly overcome host resistances is well known and is a major problem for rice breeders (Bonman 1992;Araujo et al 2000;Conaway-Bormans et al 2003;Faivre-Rampant et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

2015

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Very little information is available on neck blast resistance in Italian rice varieties under field conditions. In order to provide these data, 105 cultivars were tested under very favourable conditions for the disease development; the cultivars' response to a single treatment of tricyclazole was also evaluated. Among tested varieties, 15 % showed resistance to the disease, 17 % moderate resistance, 30 % moderate susceptibility and 38 % susceptibility. Generally, recently developed cultivars were more tolerant to neck blast, compared to the oldest ones. Furthermore, cultivars with Long A grain shape are the most susceptible to neck blast, followed by medium grain type, round grain and Long B grain shape. A single spray of tricyclazole (450 a.i. g/ha) was effective in reducing disease incidence (55 % average reduction). It was also observed that there was a reduction in severity of symptoms. The majority of rice Italian cultivars are susceptible to neck blast disease. This study underlines the importance of field tests as useful tool for researchers, breeders and growers, combining scientific value with impact in application, giving valuable information to improve disease control.

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Section: Discussionmentioning

confidence: 99%

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

2015

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“…Os somaclones derivados das cultivares altamente suscetíveis, como Maratelli, e altamente resistentes, como Ramtulasi, não apresentaram variação somaclonal em relação à brusone, como relatado no trabalho por Araújo et al (1998). Entretanto, estudos posteriores realizados por Araújo et al (1999) mostraram que é possível produzir somaclones com alto grau de resistência à brusone, a partir de cultivares moderadamente resistentes, como a Araguaia.…”

Section: Resultsunclassified

Variantes somaclonais da cultivar de arroz Bluebelle resistentes à brusone

Araújo

Prabhu

Filippi

et al. 2001

Pesq. agropec. bras.

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Resumo A brusone, causada por Pyricularia grisea, constitui fator limitante da produtividade do arroz irrigado, principalmente no Estado do Tocantins. A detecção de variabilidade genética quanto à resistência à brusone em cultivares suscetíveis, como a Bluebelle, considerada uma das cultivarespadrões quanto à qualidade dos grãos, foi o principal objetivo deste trabalho. O procedimento adotado incluiu a indução de calos provenientes de panículas imaturas, regeneração, avaliação e seleção das plantas R 2 resistentes à doença. O mesmo procedimento foi utilizado para nova indução de calos e regeneração de plantas a partir de três plantas R 2 selecionadas. Foi realizada a avaliação e a seleção de plantas resistentes nas gerações R 2 e R 4 em viveiro de brusone. Nos testes realizados em casa de vegetação com três isolados coletados da cultivar Metica-1, pertencentes aos patótipos IB-41 e IB-45 de P. grisea, todos os 47 somaclones R 6 foram resistentes. Por outro lado, os somaclones apresentaram reações diferenciais frente a cinco isolados provenientes de somaclones da cultivar Bluebelle, e resistên-cia a um isolado proveniente da cultivar Bluebelle, enquanto a cultivar Bluebelle foi suscetível a todos os isolados. Estes resultados indicaram variação genética no que diz respeito à resistência à brusone, na segunda fase de indução de calos e na regeneração de plantas. Dos 47 somaclones R 6 , 22 apresentaram alto grau de resistência vertical nos testes conduzidos nos viveiros de brusone em quatro locais, e poderão ser utilizados como novas fontes de resistência.Termos para indexação: Oryza sativa, Pyricularia grisea, cultura de tecidos, variação somaclonal, resistência a doenças. Blast resistant somaclonal variants of rice cultivar BluebelleAbstract Rice blast, caused by Pyricularia grisea, is the major yield constraint in irrigated rice mainly in the State of Tocantins. The detection of genetic variability for blast resistance in susceptible cultivars such as Bluebelle, considered as a standard for superior grain quality, was the main objective of the present investigation. The adopted procedure included the induction of callus from the immature panicles, regeneration, evaluation and selection of R 2 plants for blast resistance. The same procedure was repeated using three selected R 2 plants. The disease assessment and selection of blast resistant plants were done in R 2 and R 4 generations in blast nursery. In greenhouse tests with three isolates obtained from the cultivar Metica-1 belonging to pathotypes IB-41 and IB-45 of P. grisea, all of the 47 somaclones R 6 were resistant. They showed differential reaction to five isolates of somaclones and were resistant to one isolate derived from cultivar Bluebelle, while cultivar Bluebelle was susceptible to all isolates. These results indicated genetic variation for blast resistance in second step of induction and regeneration of plants. Of these 47 somaclones R 6 , 22 showed a high degree of vertical resistance in blast nursery tests conducted at four locations and can be u...

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“…No Brasil, foram desenvolvidos somaclones da cultivar de arroz Araguaia com resistência vertical e parcial à brusone, e da cultivar Bluebelle com resistência vertical, que podem ser utilizados como novas fontes de resistência nos programas de melhoramento genético (Araújo et al, 2000(Araújo et al, , 2001. Contudo a freqüência de variantes depende do grau de resistência à brusone da cultivar utilizada para desenvolvimento de somaclones.…”

Section: Introductionunclassified

Somaclones da cultivar de arroz aromático Basmati-370 resistentes à brusone

Araújo

Prabhu

2002

Pesq. agropec. bras.

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Resumo -A cultivar de arroz aromático Basmati-370 é uma das preferidas no mercado mundial. Possui aroma agradável, grão extra-fino, e característica de alongamento após o cozimento; porém, é suscetível a alguns patótipos de Pyricularia grisea no Brasil. O objetivo do presente trabalho foi avaliar o grau de resistência à brusone, e algumas características agronômicas nas gerações avançadas de seus somaclones. Foram estudadas gerações R 5 a R 9 , no campo, em viveiro de brusone e em casa de vegetação. Não foram observadas variações significativas na qualidade de grãos e outras características agronômicas. Entretanto, alguns somaclones apresentaram alto grau de resistência à brusone. Foram registrados no Banco Ativo de Germoplasma da Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão 19 somaclones como novas fontes de arroz aromático. Dois somaclones, SCBAS04 e SBAS16, exibiram alto grau de resistência à brusone, e foram superiores à cultivar Basmati-370 quanto ao aroma.Termos para indexação: Oryza sativa, Pyricularia grisea, cultura de tecidos, variação somaclonal, resistência a doenças. Blast resistant somaclones of aromatic rice cultivar Basmati-370Abstract -Basmati-370 is one of the most preferred aromatic fine quality rice in the world market. It has a pleasant aroma, extra fine grain and a characteristic elongation after cooking, but it is susceptible to some pathotypes of Pyricularia grisea in Brazil. The objective of the present investigation was to assess the degree of blast resistance and some agronomic characteristics in the advanced generations of its somaclones. The evaluations were carried out in R 5 to R 9 generations, in field trials, in rice blast nursery and greenhouse. Significant variations in grain quality and other agronomic characteristics were not observed. However, some of the somaclones showed higher degree of blast resistance. Nineteen somaclones were registered in the Active Germplasm Bank of Embrapa-Centro Nacional de Pesquisa de Arroz e Feijão as new aromatic rice sources. Two somaclones, SCBAS04 and SBAS16, exhibited a high degree of partial resistance to blast, and were found to be superior to cv. Basmati-370 in aromatic grain characteristic.

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Development of blast resistant somaclones of the upland rice cultivar araguaia

Cited by 21 publications

References 13 publications

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

Resistance to neck blast caused by Pyricularia oryzae in Italian rice cultivars

Variantes somaclonais da cultivar de arroz Bluebelle resistentes à brusone

Somaclones da cultivar de arroz aromático Basmati-370 resistentes à brusone

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