Race-specific expression of oat crown rust resistance conditioned by major and minor genes

Sebesta, J.

doi:10.1007/bf00042167

Cited by 10 publications

(8 citation statements)

References 4 publications

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“…Na literatura, outros trabalhos também relatam herança monogênica (Harder et al, 1990;Salmeron et al, 1994) e alelos de genes complementares (Gregory & Wise, 1994), como responsáveis pela resistência à ferrugem-da-folha em aveia. A resistência conferida por genes menores já foi observada em aveia por Sebesta (1983); no entanto, é mais comumente observada em cruzamentos envolvendo genótipos com resistência parcial e genótipos suscetíveis (Thomé, 1999).…”

Section: Resultsunclassified

“…A aveia (Avena sativa L.) é um cereal de estação fria, que se apresenta como uma excelente alternati-de uma forma mais séria em condições de umidade elevada (Simons & Murphy, 1961).…”

Section: Introductionunclassified

“…Muitos deles relatam casos de herança monogênica da resistência (Harder et al, 1990;Salmeron et al, 1994), assim como de genes complementares condicionando resistência à ferrugemda-folha da aveia (Gregory & Wise, 1994). A existência de genes menores condicionando resistência raça-específica a esta doença em aveia foi observada por Sebesta (1983). A maioria destes estudos utiliza métodos artificiais de inoculação e raças específicas do patógeno para a avaliação da resistên-cia, sendo normalmente conduzidos sob condições controladas, e as plantas, avaliadas ainda no estádio de plântula, mais ou menos 10 a 12 dias após o procedimento de inoculação do patógeno.…”

Section: Introductionunclassified

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Genética da resistência à ferrugem-da-folha em aveia

Cruz

Federizzi²,

Milach³

2001

Pesq. agropec. bras.

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Resumo A ferrugem-da-folha (Puccinia coronata f. sp. avenae) é a principal doença da cultura da aveia (Avena sativa L.), e o uso de cultivares resistentes é o método de controle mais importante. Este trabalho teve por objetivo determinar o controle genético da resistência à ferrugem-da-folha em aveia e identificar fontes de genes diferentes para resistência a esta doença. Foram utilizados três genótipos resistentes (UFRGS 15, UFRGS 881920 e UFRGS 86A1194-2), três genótipos suscetíveis (UFRGS 7, UFRGS 8 e UFRGS 14) e a geração segregante F 3 proveniente dos cruzamentos entre estes genótipos. As plantas foram avaliadas individualmente quanto à presença ou ausência da ferrugem-da-folha, sendo os dados destas leituras utilizados numa análise genética em que a hipótese de um ou dois genes de resistência foi testada pelo qui-quadrado. Os resultados evidenciaram um gene dominante de resistên-cia no genótipo UFRGS 881920 e dois genes complementares no genótipo UFRGS 15 quando estes foram cruzados com os suscetíveis. A análise genética feita não permitiu determinar se estes dois genótipos são ou não a mesma fonte genética de resistência.Termos para indexação: Avena sativa, resistência a doenças, Puccinia coronata, doenças das plantas, controle genético. Genetics of crown rust resistance in oatAbstract Crown rust (Puccinia coronata f. sp. avenae) is the main disease in the oat crop (Avena sativa L.) and the use of resistant cultivars is the most important control method. This study had as objective to determine the genetic control of resistance to crown rust in oat and to identify different gene sources for resistance to this disease. Three resistant genotypes (UFRGS 15, UFRGS 881920 and UFRGS 86A1194-2), three susceptible genotypes (UFRGS 7, UFRGS 8 and UFRGS 14) and the F 3 progenies derived from crosses between these genotypes were used. The plants were evaluated individually with regard to the presence or absence of crown rust symptoms, and the data from these evaluations were used to perform a genetic analysis in which the hypothesis of one or two resistance genes were tested by the chi-square test. Results showed one dominant resistance gene in UFRGS 881920 and two complementary resistance genes in UFRGS 15, when they were crossed with the susceptible genotypes. The genetic analysis performed did not allow to determine whether these two genotypes are or are not the same source of resistance.

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Section: Resultsunclassified

“…A aveia (Avena sativa L.) é um cereal de estação fria, que se apresenta como uma excelente alternati-de uma forma mais séria em condições de umidade elevada (Simons & Murphy, 1961).…”

Section: Introductionunclassified

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Genética da resistência à ferrugem-da-folha em aveia

Cruz

Federizzi²,

Milach³

2001

Pesq. agropec. bras.

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“…The latter authors observed segregation within the Pc50 line and reselected Pc50-2 and Pc50-4. Genetic analysis based on crosses indicated that each of the reselected lines contained a different major resistance gene [ 25 ].…”

Section: Discussionmentioning

confidence: 99%

“…The differential line Pc50 belongs to the set of nearly isogenic lines of the A. sativa cultivar Pendek, into which crown rust resistance genes were introgressed from A. sterilis CW 486-1 by backcrossing [ 23 ]. Šebesta and Harder [ 24 ] used Polish P. coronata isolates and reselected two lines from Pc50 differential: Pc50-2 and Pc50-4, each carrying a distinct major gene [ 25 , 26 ]. In our study, we also found segregation of some P. coronata races originated from Poland within the Pc50 line derived from the Canadian Pc differential set, suggesting the presence of another previously unidentified resistance gene, designated here as Pc50-5 .…”

Section: Introductionmentioning

confidence: 99%

Discovery and Chromosomal Location a Highly Effective Oat Crown Rust Resistance Gene Pc50-5

Toporowska

Sowa

Kilian

et al. 2021

IJMS

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Crown rust, caused by Puccinia coronata f. sp. avenae, is one of the most destructive fungal diseases of oat worldwide. Growing disease-resistant oat cultivars is the preferred method of preventing the spread of rust and potential epidemics. The object of the study was Pc50-5, a race-specific seedling crown rust resistant gene, highly effective at all growth stages, selected from the differential line Pc50 (Avena sterilis L. CW 486-1 × Pendek). A comparison of crown rust reaction as well as an allelism test showed the distinctiveness of Pc50-5, whereas the proportions of phenotypes in segregating populations derived from a cross with two crown rust-susceptible Polish oat cultivars, Kasztan × Pc50-5 and Bingo × Pc50-5, confirmed monogenic inheritance of the gene, indicating its usefulness in oat breeding programs. Effective gene introgression depends on reliable gene identification in the early stages of plant development; thus, the aim of the study was to develop molecular markers that are tightly linked to Pc50-5. Segregating populations of Kasztan × Pc50-5 were genotyped using DArTseq technology based on next-generation Illumina short-read sequencing. Markers associated with Pc50-5 were located on chromosome 6A of the current version of the oat reference genome (Avena sativa OT3098 v2, PepsiCo) in the region between 434,234,214 and 440,149,046 bp and subsequently converted to PCR-based SCAR (sequence-characterized amplified region) markers. Furthermore, 5426978_SCAR and 24031809_SCAR co-segregated with the Pc50-5 resistance allele and were mapped to the partial linkage group at 0.6 and 4.0 cM, respectively. The co-dominant 58163643_SCAR marker was the best diagnostic and it was located closest to Pc50-5 at 0.1 cM. The newly discovered, very strong monogenic crown rust resistance may be useful for oat improvement. DArTseq sequences converted into specific PCR markers will be a valuable tool for marker-assisted selection in breeding programs.

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Diseases of Oats

Simons

1986

Proceedings of the Second International Oats Conference

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Race-specific expression of oat crown rust resistance conditioned by major and minor genes

Cited by 10 publications

References 4 publications

Genética da resistência à ferrugem-da-folha em aveia

Genética da resistência à ferrugem-da-folha em aveia

Discovery and Chromosomal Location a Highly Effective Oat Crown Rust Resistance Gene Pc50-5

Diseases of Oats

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