Controle genético da resistência à mancha-de-Phaeosphaeria em milho

Lopes, Maria Teresa Gomes; Lopes, Ricardo; Brunelli, Kátia Regiane; Silva, Herberte Pereira da; Matiello, Rodrigo Rodrigues; Camargo, Luís Eduardo Aranha

doi:10.1590/s0103-84782007000300001

Cited by 14 publications

(14 citation statements)

References 5 publications

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“…These results corroborate the fact of resistance to Phaeosphaeria leaf spot and to gray leaf spot being of the horizontal type (Bubeck et al, 1993;Lopes et al, 2007) in which the pathogenhost interaction is less specific. In addition, there were probably pathogen populations genetically similar among themselves in the environments evaluated.…”

Section: Resultssupporting

confidence: 86%

Evaluation of Maize Hybrids Tolerant to Phaeosphaeria Leaf Spot, Gray Leaf Spot and Common Rust and Yield

Camargos¹,

Souza²,

Alves³

et al. 2017

RBMS

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-The objectives of this study were to identify maize hybrids which have high grain yield and resistance to Phaeosphaeria leaf spot, gray leaf spot and common rust, as well as to estimate the most efficient period for measuring the reaction of the hybrids to the pathogens. Two experiments were set up in Lavras, MG, Brazil, assessing 30 hybrids in the season of 2011/2012. The experimental design was a 6 x 5 lattice arrangement with three replications.Grain yield was evaluated and five assessments of disease severity were performed at ten-day intervals as of 60 days after maize emergence. After that, the area under the disease progress curve (AUDPC) and the Spearman correlations between the diseases and the various assessment periods for each disease were estimated. It was found that the hybrids GNZ9626 PRO and GNZ9501 PRO have high grain yield and a satisfactory level of resistance to Phaeosphaeria leaf spot, gray leaf and common rust, and that assessment of the level of resistance to these diseases should be performed in the period from 80 to 100 days after plant emergence, which provides results similar to AUDPC.Keywords: Zea mays L., Leaf diseases, Genetic resistance. AVALIAÇÃO DE HÍBRIDOS DE MILHO À MANCHA BRANCA, CERCOSPORIOSE E FERRUGEM COMUM E À PRODUTIVIDADERESUMO -Os objetivos deste trabalho foram identificar híbridos de milho que apresentem alta produtividade de grãos e resistência à mancha-branca, cercosporiose e ferrugem comum, bem como estimar a época de avaliação mais eficiente para mensurar a reação dos híbridos aos patógenos causadores dessas doenças. Para isso, foram instalados dois experimentos no município de Lavras, MG e avaliados 30 híbridos no ano agrícola de 2011/2012. O delineamento experimental utilizado foi o látice 6 x 5 com três repetições. Foi avaliada a produtividade de grãos e realizadas cinco avaliações da severidade dessas enfermidades, em intervalos de 10 dias, a partir de 60 dias da emergência das plantas.Posteriormente, estimou-se a área abaixo da curva de progresso das doenças (AACPD) e a correlação de Sperman entre as mesmas com as diversas épocas de avaliação de cada doença. Constatou-se que os híbridos GNZ9501 PRO e GNZ9626 PRO apresentam alta produtividade de grãos e satisfatório nível de resistência à mancha-branca, cercosporiose e ferrugem comum e que para a avaliação do nível de resistência a essas enfermidades deve-se optar pela avaliação no período que compreende 80 a 100 dias após a emergência das plantas, o qual fornece resultados semelhantes à AACPD. Palavras-chave:Zea mays L., Doenças foliares, Resistência genética.

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Section: Resultssupporting

confidence: 86%

Evaluation of Maize Hybrids Tolerant to Phaeosphaeria Leaf Spot, Gray Leaf Spot and Common Rust and Yield

Camargos¹,

Souza²,

Alves³

et al. 2017

RBMS

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“…These findings indicate that genetic control for this trait may vary across the different sources of resistance. In this case, it is up to breeding programs to characterize their sources of resistance to achieve maximum efficiency during the selection process (Lopes et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Research Article Genetic control and combining ability of agronomic attributes and northern leaf blight-related attributes in popcorn.

Santos¹,

Júnior²,

Vivas³

et al. 2017

Genet. Mol. Res.

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ABSTRACT. The present study was conducted to investigate the genetic control and to estimate the general and specific combining abilities of popcorn for agronomic attributes and attributes related to resistance to northern leaf blight (NLB). The 56 hybrids (F 1 and reciprocals), together with the eight parent lines and six controls, were evaluated in two harvests, in a randomized-block design with four replications. Dominance components were more expressive than the additive components for grain yield and expression of resistance, and hybridization was the most suitable option for obtaining resistant and productive genotypes. For grain yield, popping expansion, and resistance to NLB, there was no significance for reciprocal effects, which indicates that the direction in which the cross is performed does not interfere with the hybrid's performance. Then, the superior hybrids recommended for more profitable growth were P8 x L61, L61 x L76, and L61 x L77.

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“…The other UEM hybrids of the trial constituted the group with highest disease susceptibility. Different resistance levels to Phaeosphaeria leaf spot is often reported for common maize genotypes (Santos et al 2002, Souza and Duarte 2002, Pegoraro et al 2002, Juliatti and Souza 2005, Lopes et al 2007). The negative correlation between disease severity and grain yield (-0.45), reported by Pegoraro et al (2001), reinforces the need of using genotypes with greater resistance.…”

Section: Resultsmentioning

confidence: 99%

Genetic resistance of new popcorn hybrids to foliar diseases

Vieira¹,

Tessmann²,

Scapim³

et al. 2009

CBAB

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Controle genético da resistência à mancha-de-Phaeosphaeria em milho

Abstract: A mancha-de-Phaeosphaeria, de ampla ocorrência no Brasil, tem causado expressiva redução na produtividade da cultura do milho no país. Por isso, o desenvolvimento de híbridos resistentes à doença é um dos principais objetivos dos programas

Cited by 14 publications

References 5 publications

Evaluation of Maize Hybrids Tolerant to Phaeosphaeria Leaf Spot, Gray Leaf Spot and Common Rust and Yield

Evaluation of Maize Hybrids Tolerant to Phaeosphaeria Leaf Spot, Gray Leaf Spot and Common Rust and Yield

Research Article Genetic control and combining ability of agronomic attributes and northern leaf blight-related attributes in popcorn.

Genetic resistance of new popcorn hybrids to foliar diseases

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