Inheritance pattern of downy mildew resistance in advanced generations of sorghum*

Reddy, B V S; Mughogho, L.K.; Narayana, Y. D.; Nicodemus, K. D.; Stenhouse, J W

doi:10.1111/j.1744-7348.1992.tb03437.x

Cited by 17 publications

(13 citation statements)

References 2 publications

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“…Genetic variation for resistance to this pathogen has also been reported [112][113][114]. Multiple races of downy mildew that infect sorghum have been identified and, consequently, resistance genes have come from multiple sources [113].…”

Section: Breeding For Stress Tolerancementioning

confidence: 99%

“…Resistance to single races of this pathogen is reported as simply inherited and, therefore, resistance to the pathogen in general is described as oligogenic in most cases [115]. For example, resistance to the ICRISAT Centre race has been described as fitting the expected ratio of a two locus model with complementary and inhibitory interactions [114]. Thus, it is feasible to pyramid resistance genes for multiple races as new ones are identified.…”

Section: Breeding For Stress Tolerancementioning

confidence: 99%

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Sorghum

Rooney

2014

Cellulosic Energy Cropping Systems

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Section: Breeding For Stress Tolerancementioning

confidence: 99%

Section: Breeding For Stress Tolerancementioning

confidence: 99%

Sorghum

Rooney

2014

Cellulosic Energy Cropping Systems

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“…Alguns pesquisadores propuseram a hipótese de que a linhagem de sorgo QL-3, resistente às três raças identificadas no Texas, possui dois genes dominantes condicionando resistência, enquanto a linhagem SC414-12, possui um ou dois genes dominantes controlando a resistência às três raças (Craig & Schertz, 1985;Sifuentes & Frederiksen, 1988;Reddy et al, 1992). Em trabalho realizado anteriormente na �ndia, concluiu-se que a resistência da cultivar QL3 era condicionada por 6 genes (Bhat, 1981).…”

Section: Genética E Herança Da Resistênciaunclassified

Peronosclerospora sorghi, o agente etiológico do míldio do sorgo

Barbosa

Pfenning

Casela³

2006

Fitopatol. bras.

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RESUMOO agente etiológico do míldio do sorgo, Peronosclerospora sorghi, infecta as culturas do sorgo (Sorghum spp.) e do milho (Zea mays). Esse patógeno encontra-se disseminado em muitas regiões tropicais e subtropicais do mundo e pode ocasionar danos significativos na produção de sorgo quando as condições climáticas são favoráveis à sua ocorrência e em cultivares de alta susceptibilidade. No Brasil, antes restrito aos estados da região Sul, o míldio foi registrado também nos estados da região Sudeste e Centro-Oeste, causando prejuízos principalmente em áreas de produção de sementes. O cultivo de genótipos resistentes é o método mais eficiente para o controle da doença. Entretanto, essa estratégia é dificultada pela alta variabilidade genética apresentada pelo patógeno. Essa revisão aborda aspectos da taxonomia, biologia e distribuição geográfica do míldio do sorgo e discute questões relacionadas com a sua epidemiologia e controle, enfatizando estratégias que utilizam resistência genética.Palavras-chave adicionais: Straminipila, Sclerosporales, oomiceto, fitodoença, epidemiologia, controle, resistência. ABSTRACT Peronosclerospora sorghi, the causal agent of sorghum downy mildewThe causal agent of sorghum downy mildew, Peronosclerospora sorghi, is a pathogen of sorghum species (Sorghum spp.) and corn (Zea mays). The pathogen is disseminated in many tropical and subtropical regions all around the world, causing considerable losses when conditions are favorable for its development or susceptible cultivars are used. Within Brazil it was initially restricted to the Southern region but has now also spread to the Southeast and Middle-West, causing significant losses specifically in areas of seed production. The use of resistant genotypes is the most efficient method to control the disease. Nevertheless, a high genetic variability of the pathogen makes it difficult to use resistant cultivars. This revision considers aspects of taxonomy and biology of sorghum downy mildew and discusses questions related to geographic distribution, epidemiology and control, focusing on strategies that use genetic resistance.

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“…A further study by Reddy et al, (1992) also found resistance in QL-3 was dominant over susceptibility; a two-locus model with independent segregation and a combination of complementary and inhibitory interallelic interaction explained the inheritance pattern they observed. However, most resistance in sorghum is presumed to be monogenic, some possibly oligogenic, which implies a threat of resistance breaking down (Craig and Odvody, 1992).…”

Section: Inheritance Of Resistance To Sorghum Downy Mildewmentioning

confidence: 99%

“…Nevertheless in two crosses additive gene effect was also significant in addition to dominant gene effect (Krishnappa et al, 1995). Susceptibility to SDM infection was found to be partially dominant over resistance and resistance to SDM controlled by polygenes where as in sorghum resistance to SDM was found to be dominant (Reddy et al, 1992). No attempt has been reported in maize regarding number of genes involved for resistance to SDM using a chi-square test so far.…”

Section: Inheritance Of Resistance To Sorghum Downy Mildewmentioning

confidence: 99%