scholarly journals Characterization in isogenic lines of oat crown rust resistance genes from four sources

1971 ◽  
Author(s):  
Bhisham Pal Singh
Keyword(s):  
Resistance Genes ◽  
Rust Resistance ◽  
Crown Rust ◽  
Isogenic Lines ◽  
Oat Crown Rust ◽  
Crown Rust Resistance ◽  
Rust Resistance Genes

scholarly journals Virulence Associations in Oat Crown Rust

2005 ◽  
Vol 95 (1) ◽  
pp. 53-61 ◽  
Author(s):  
K. J. Leonard ◽  
Y. Anikster ◽  
J. Manisterski
Keyword(s):  
South Dakota ◽  
Rust Resistance ◽  
Natural Populations ◽  
Crown Rust ◽  
Northern Plains ◽  
Avena Sterilis ◽  
Oat Crown Rust ◽  
Crown Rust Resistance ◽  
Oat Cultivars ◽  
Rust Resistance Genes

Isolates of Puccinia coronata obtained from natural populations of Avena sterilis in Israel, winter oat (A. sativa) cultivars in Texas, and spring oat cultivars in the Northern Plains states of Minnesota, North Dakota, and South Dakota were analyzed for significance of pairwise virulence associations. Isolates from all three regions were tested on 25 oat lines with single P. coronata (Pc) genes for crown rust resistance from A. sterilis and one line with a Pc gene from A. sativa. Isolates from Israel were tested also on 11 Iowa backcross lines with undesignated crown rust resistance genes from A. sterilis. Four associated virulence groups were identified from significant positive virulence associations that were consistent across all three regions. Group 38 included virulence to Pc-38, Pc-39, Pc-55, Pc-63, and Pc-71; group 45 included virulence to Pc-45, Pc-46, Pc-48, Pc-52, Pc-54, and Pc-57; group 58 included virulence to Pc-35, Pc-40, Pc-58, and Pc-59; and group 61 included virulence to Pc- 36, Pc-51, Pc-56, Pc-60, and Pc-61. Virulence to Pc-70 showed the strongest association to virulences in group 38 but also showed significant association with virulence to Pc-45, Pc-35, and Pc-58. Virulences in group 61 were consistently negatively associated with virulences in group 38 in each region. In Israel, virulences to five of the Iowa lines showed positive associations to virulences in group 61 and negative associations to virulences in groups 38 and 45. Close similarity of reactions of nearly all isolates to Pc-39, Pc-55, and Pc-71 suggest that these genes may be identical or nearly identical alleles.

scholarly journals Preliminary screening of Avena sterilis L. for resistance to crown rust

2020 ◽  
Vol 75 (2) ◽  
pp. 37-45
Author(s):  
SYLWIA SOWA
Keyword(s):  
Resistance Genes ◽  
Genetic Background ◽  
Rust Resistance ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
Avena Sterilis ◽  
Preliminary Screening ◽  
Gene Banks ◽  
Crown Rust Resistance ◽  
Rust Resistance Genes

The best source of crown rust resistance genes (Pc) in genus Avena is a wild hexaploid A. sterilis L. In this study, accessions of A. sterilis gathered from European and North American gene banks, originated from 21 countries were evaluated at the seedling stage for crown rust reaction using the host–pathogen test and two Puccinia coronata f. sp. avenae isolates. Of the 45 oat accessions analyzed, 12 were resistant to one crown rust race (3.2). Resistance to both pathotypes used in the study was observed in two of the accessions, first of which was collected in Libya (AVE 2532) and second in Portugal (CN 26036). Further research is required to evaluate the genetic background of the discovered resistance, however, obtained results provide a valuable first step in the identification of new promising crown rust resistance sources.

INHERITANCE OF CROWN RUST RESISTANCE IN THREE ACCESSIONS OF AVENA STERILIS

1980 ◽  
Vol 22 (1) ◽  
pp. 27-33 ◽  
Author(s):  
D. E. Harder ◽  
R. I. H. McKenzie ◽  
J. W. Martens
Keyword(s):  
Rust Resistance ◽  
Dominant Gene ◽  
Crown Rust ◽  
Inheritance Of Resistance ◽  
Single Dominant Gene ◽  
Avena Sterilis ◽  
Oat Crown Rust ◽  
Crown Rust Resistance ◽  
Resistance Spectrum ◽  
Dominant Genes

The inheritance of resistance to oat crown rust was studied in three accessions of Avena sterilis L. Accession CAV 4274 originated from Morocco, CAV 4540 from Algeria, and CAV 3695 from Tunisia. Seedling rust tests on F2 backcross families indicated the presence of two dominant genes for crown rust resistance in CAV 4274. One of these, a gene conditioning resistance to most races tested, was linked or allelic to gene Pc-38, and was designated gene Pc-62. The second gene conferred resistance only to one of the six races studied, and was not tested further. In CAV 4540, a single dominant gene, Pc-63 was possibly allelic with Pc-62 and linked or allelic to Pc-38. Genes Pc-62 and 63 are generally similar to Pc-38 in their resistance spectrum, but these three genes are differentiated by races CR 102, CR 103, and CR 107. A single dominant gene in CAV 3695 appeared to be Pc-50.

INHERITANCE OF CROWN RUST RESISTANCE GENES IN AVENA STERILIS COLLECTIONS FROM ISRAEL, PORTUGAL, AND TUNISIA

1971 ◽  
Vol 13 (2) ◽  
pp. 251-255 ◽  
Author(s):  
G. Fleischmann ◽  
R. I. H. McKenzie ◽  
W. A. Shipton
Keyword(s):  
Resistance Genes ◽  
Rust Resistance ◽  
Dominant Gene ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
Avena Sterilis ◽  
Wild Oats ◽  
Puccinia Coronata Avenae ◽  
Dominant Genes ◽  
Rust Resistance Genes

The inheritance of genes in three collections of Avena sterilis wild oats conferring resistance to races 216, 264, 295, 305, 326, 330, 332, and 446 of crown rust, Puccinia coronata avenae, was investigated. C. I. 8081 from Portugal contained a partially dominant gene, designated Pc47, which conferred resistance to all eight races. CW486 from Tunisia had a dominant gene, designated Pc50, which gave resistance to all races except 295, 326, and 446. F158 from Israel had two dominant genes; one, designated Pc48, conferred resistance to all the races but 305, while the second, designated Pc49, conferred resistance to races 216, 326, 330, 332, and 446. Genes Pc47, Pc48, Pc49, and Pc50 were inherited independently of each other and of those genes previously isolated from A. sterilis.

scholarly journals Characteristics of Resistance to Puccinia coronata f. sp. avenae in Avena fatua

Plant Disease ◽  
2018 ◽  
Vol 102 (12) ◽  
pp. 2616-2624 ◽  
Author(s):  
Edyta Paczos-Grzeda ◽  
Sylwia Sowa ◽  
Aneta Koroluk ◽  
Tim Langdon
Keyword(s):  
Resistance Genes ◽  
Rust Resistance ◽  
The United States ◽  
Avena Fatua ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
United States Department ◽  
Seedling Resistance ◽  
Infection Pattern ◽  
Crown Rust Resistance

Crown rust, caused by Puccinia coronata f. sp. avenae, is the most widespread and harmful fungal disease of oat. The best defense against the pathogen is use of cultivars with genetic resistance, which is effective, economic, and an environmentally friendly alternative to chemical control. However, the continuous evolution of the pathogen can rapidly overcome major gene resistance, creating an urgent need to identify new sources. Wild oat accessions have already proven to be valuable donors of many resistance genes, but the weed species Avena fatua remains underexploited. Its abundance across multiple environments and the frequent occurrence of herbicide-resistant populations demonstrate its ready ability to adapt to biotic and abiotic stresses; yet, surprisingly, there are no extensive studies which describe crown rust resistance occurrence in gene bank stocks of A. fatua. In this study, 204 accessions of A. fatua maintained in the collections of the United States Department of Agriculture (USDA) and Polish National Centre for Plant Genetic Resources were evaluated at the seedling stage for crown rust reaction using host–pathogen tests with five highly diverse and virulent races of P. coronata. Of tested genotypes, 85% showed a heterogeneous infection pattern, while 61% were susceptible or moderately susceptible to all races. Of the 79 resistant A. fatua accessions, seedling resistance to at least two P. coronata isolates was recognized within 19 accessions, with 13 displaying a homogeneously resistant phenotype to one or two races. Accessions showing multiple single seedling resistance to three or four isolates were observed. Based on the seedling reaction to isolates used in the study, 18 infection profiles (IP) were determined. Using UPGMA clustering, resistant accessions were divided into six main clusters encompassing samples with similar IPs. Twelve of 18 patterns allowed us to postulate the likely presence of novel crown rust resistance genes, whose origin was predominantly from Kenya or Egypt. Future work will clarify the genetic basis of the resistances observed here, as well as confirm their potential utility in breeding resistant oat cultivars.

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