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

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

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

2015

View full text Add to dashboard Cite

show abstract

“…Somaclones highly resistant to blast were obtained from the susceptible rice cultivar 'Araguaia', and the resistance was shown to be controlled by a single dominant major gene to P. grisea race IB-45 (Araújo et al, 1999;Araújo et al, 2000). These somaclones differed from the original parental cultivar in fan-shaped plant type, blast resistance, and yield potential.…”

Section: Introductionmentioning

confidence: 99%

Identification of rapd marker linked to blast resistance gene in a somaclone of rice cultivar Araguaia

2002

View full text Add to dashboard Cite

The gene Pi-ar confers resistance to Pyricularia grisea race IB-45 in a somaclone derived from immature panicles of the susceptible rice (Oryza sativa) cultivar Araguaia. RAPD technique was used to identify molecular markers linked to this gene utilizing bulked segregant analysis. Initially, the two parental DNAs from the resistant donor SC09 and 'Araguaia' were analyzed using random primers. Of the 240 primers tested, 203 produced amplification products. The two parental DNAs along with the resistant and susceptible bulks of F2 population were screened using 48 primers that differentiated resistant and susceptible parents. Even though eight primers differentiated the resistant bulk from the susceptible bulk, as well as somaclone SC09 and 'Araguaia', only one primer, OPC02 ('GTGAGGCGTC'), was found to be tightly linked (1.7cM) to the resistance gene of somaclone SC09.

show abstract

“…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.

Self Cite

View full text Add to dashboard Cite

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...

show abstract

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

Identification of rapd marker linked to blast resistance gene in a somaclone of rice cultivar Araguaia

Variantes somaclonais da cultivar de arroz Bluebelle resistentes à brusone

Contact Info

Product

Resources

About