Graus de resistência à brusone e produtividade de cultivares melhoradas de arroz de terras altas

Prabhu, A. S.; Filippi, Marta Cristina Corsi de

doi:10.1590/s0100-204x2001001200002

Cited by 12 publications

(7 citation statements)

References 6 publications

(4 reference statements)

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“…Of course, this behaviour is completely expected as the breeding programmes select for a multitude of traits, mainly related to productivity and not solely for disease resistance. The high gains for specific selection based only in disease would very likely not be translated in gains in other important traits as grain yield, since correlations between resistance to disease and yield, although positive, are not particularly high (Prabhu & Filippi, 2001).…”

Section: Discussionmentioning

confidence: 99%

Genetic progress of upland rice (Oryza sativa L.) lines for disease resistance

et al. 2020

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The rice crop is affected by diseases throughout its cycle, impacting negatively on grain yield and quality. The control of the disease impact can be accomplished via crop breeding, using highly multiple resistant genotypes. This study aimed to evaluate the efficiency of multiple‐character and specific selection of multiple resistance to major culture‐associated diseases (neck blast, leaf scald and grain discoloration) in rice lines of the Upland Rice Genetic Breeding Program. The experiments were conducted in 35 sites during 12 agricultural years, where 124 lines were evaluated for the severity of fungal diseases, under natural field conditions. Multiple parameters were calculated based on the diseases´ scores: genetic, phenotypic and environmental variances, heritability, selection gain, renewal rate, and genetic and renewal progress. Genetic variance for the disease resistance was identified in the population, and the selection gain for multiple‐character selection was of 3.16 year−1 throughout the breeding process with a renewal rate of over 35%. The programme has showed efficiency in selecting multiple resistant genotypes to the mentioned diseases, highlighting genotypes with high potential for market release.

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Section: Discussionmentioning

confidence: 99%

Genetic progress of upland rice (Oryza sativa L.) lines for disease resistance

et al. 2020

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“…Improved rice cultivars, such as IAC 202 and Caiapó, are superior in grain quality to Rio Paranaíba and Araguaia but susceptible to blast (Prabhu & Filippi, 2001). There has been considerable emphasis on the integrated rice blast control including fungicides as one of the inputs to keep the disease at tolerable levels (Filippi & Prabhu, 1997a).…”

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confidence: 99%

Cultivar response to fungicide application in relation to rice blast control, productivity and sustainability

Prabhu

Filippi

Zimmermann

2003

Pesq. agropec. bras.

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-Four field trials were conducted, from 1995 to 1997, with the objective of studying the response of four upland cultivars to foliar fungicide application in relation to panicle blast control, grain yield and sustainability. Differential disease control and yield response of cultivars to fungicide treatment were obtained. Losses in grain yield of cultivars IAC 202, Caiapó, Rio Paranaíba and Araguaia due to panicle blast were 44.8%, 27.4%, 24.4% and 18.2%, respectively. Two applications of tricyclazole or benomyl controlled panicle blast, as indicated by lower values of disease progress curve and relative panicle blast severity, and increased grain yield of the cultivar IAC 202. The losses in 100 panicle grain weight and grain yield were significantly reduced by 22.3% and 25.1% in IAC 202 and 23.6% and 20.5% in Caiapó, respectively, with two sprays of tricyclazole. Sustainable value index for yield was maximum with two applications of tricyclazole (0.59), followed by one application at booting (0.46) and at heading (0.40) in cultivar IAC 202. Results showed no yield response of the cultivars Rio Paranaíba and Araguaia to fungicide applications for panicle blast control.Index terms: Oryza sativa, yield factors, pest control, chemical control. Resposta de cultivares de arroz à aplicação de fungicidas em relação ao controle da brusone nas panículas, produtividade e sustentabilidadeResumo -Foram realizados quatro experimentos no campo, de 1995 a 1997, com o objetivo de estudar a resposta das cultivares de arroz de terras altas à aplicação de fungicidas foliares, em relação ao controle da brusone nas panículas, produtividade e sustentabilidade. Foram obtidas respostas diferenciais das cultivares às aplicações de fungicidas quanto ao controle da brusone e produtividade. As perdas em produtividade, causadas pela brusone, nas panículas, foram de 44,8%, 27,4%, 24,4% e 18,2% nas cultivares IAC 202, Caiapó, Rio Paranaíba e Araguaia, respectivamente. Os valores da área sob curva de progresso da doença e da severidade relativa da brusone nas panículas foram menores, resultando em aumento de produtividade com duas aplicações de tricyclazole ou benomyl na cultivar IAC 202. As perdas quanto ao peso de 100 panículas e produtividade foram 22,3% e 25,1% na IAC 202, e 23,6% e 20,5% na Caiapó, respectivamente, com duas aplicações de tricyclazole. O valor do índice de sustentabilidade para produtividade foi máximo (0,59) com duas aplicações de tricyclazole, seguido por uma aplicação no emborrachamento (0,46) e na emissão de panícula (0,40) na cultivar IAC 202. Houve ausência de resposta das cultivares Rio Paranaíba e Araguaia às aplicações de fungicidas no controle da brusone nas panículas em relação à produtividade.

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“…Rodríguez et al (1998) showed high leaf blast variability in rice genotypes and concluded that the resistance level of some genotypes is low and requires complementary control measures. Prabhu and Filippi (2001) demonstrate the relevance of incorporating resistance genes in new genotypes against the most frequent breeds of the pathogen.…”

Section: A B C Dmentioning

confidence: 95%

Multiline aiming at phenotypic stability and rice blast resistance

Castro

Moura²,

Alves³

et al. 2022

Biosci. J.

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This study aimed to verify the efficiency of multilines in reducing blast progress and their potential benefits to phenotypic stability in rice. The experiments were conducted in the 2016/17 and 2017/18 agricultural years. A randomized block design was performed with three replications, evaluating 12 lines and a multiline, which consisted of five lines from the Cultivation and Use Value (CUV) test. The multiline presented an estimated grain yield above the average of experiments of around seven bags ha-1 and superior performance in early flowering, justifying the high phenotypic stability for these characters. In this case, the line selection for composing the multiline was favorable and efficient, highlighted by a higher agronomic performance than most lines of the CUV test. The multiline is an adequate strategy to provide higher phenotypic stability and reduce blast progress in the field.

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Graus de resistência à brusone e produtividade de cultivares melhoradas de arroz de terras altas

Cited by 12 publications

References 6 publications

Genetic progress of upland rice (Oryza sativa L.) lines for disease resistance

Genetic progress of upland rice (Oryza sativa L.) lines for disease resistance

Cultivar response to fungicide application in relation to rice blast control, productivity and sustainability

Multiline aiming at phenotypic stability and rice blast resistance

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