PRODUCTION OF TELIA OF PURE RACES OF OAT CROWN RUST FOR GENETIC STUDIES OF VIRULENCE

1964 ◽  
Vol 42 (10) ◽  
pp. 1457-1458 ◽  
Author(s):  
George Fleischmann
Keyword(s):  
Crown Rust ◽  
Genetic Studies ◽  
Oat Crown Rust

Hypersensitive lignification response as the mechanism of non-host resistance of wheat against oat crown rust

1990 ◽  
Vol 78 (4) ◽  
pp. 609-615 ◽  
Author(s):  
Bruno M. Moerschbacher ◽  
Ulrike Noll ◽  
Carlos A. Ocampo ◽  
Berenike E. Flott ◽  
Uwe Gotthardt ◽  
...  
Keyword(s):  
Host Resistance ◽  
Crown Rust ◽  
Oat Crown Rust

scholarly journals Virulence of Oat Crown Rust in Brazil and Uruguay

Plant Disease ◽  
2005 ◽  
Vol 89 (8) ◽  
pp. 802-808 ◽  
Author(s):  
K. J. Leonard ◽  
J. A. Martinelli
Keyword(s):  
Avena Sativa ◽  
Western Siberia ◽  
Specific Resistance ◽  
The United States ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
South American ◽  
Oat Crown Rust ◽  
High Virulence ◽  
Important Disease

Race-specific resistance to crown rust, the most important disease of oat (Avena sativa) in Bra-zil, often fails within a few years of use in Brazilian cultivars. Virulence of 144 isolates of Puccinia coronata from cultivated oat in Brazil in 1997 to 1999 and 36 isolates from Uruguay in 1994-95 and 1998 was tested on a set of 27 oat crown rust differentials lines, each with a different Pc gene for race-specific resistance. Frequencies of virulence and mean virulence complexity were compared among these five collections from Brazil and Uruguay as well as with mean virulence complexity for a collection of 17 isolates from cultivated oat in western Siberia in Russia. Virulence-avirulence for each of the 27 Pc genes was polymorphic in both Brazil and Uruguay. Virulence frequencies were similar for collections from Brazil in 1998 and 1999 and for the collection from Uruguay from 1998, but there were large differences between the 1997 collection and the 1998 and 1999 collections from Brazil. Mean virulence complexity in both Brazil and Uruguay was greater than reported in the United States and much greater than in the Russian collection of P. coronata. A large number of races of P. coronata were found, with no more than five isolates of any race found in a single year in Brazil or Uruguay. The high virulence complexity and great diversity of virulence polymorphisms in Brazil and Uruguay make it unlikely that race-specific resistance can be effective there even though the South American populations of P. coronata are apparently entirely asexual.

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.

Assessment of virulence patterns in crown rust populations

1968 ◽  
Vol 46 (5) ◽  
pp. 613-617 ◽  
Author(s):  
George Fleischmann
Keyword(s):  
Crown Rust ◽  
Puccinia Coronata ◽  
Western Canada ◽  
Differential Host ◽  
Oat Crown Rust ◽  
Virulence Pattern ◽  
Continued Use ◽  
Race Identification

Two methods of determining the virulence pattern of oat crown rust, Puccinia coronata f. sp. avenae, populations collected in 1965, 1966, and 1967, in Eastern and Western Canada were compared. The results with a single-pustule isolate from each of 50 field collections were as accurate as those obtained with two single-pustule isolates from 100 or more field collections. The continued use of Bond and Ukraine as differential host varieties is of little value except for purposes of race identification, because they are attacked by most of the isolates.

Hypersensitive lignification response as the mechanism of non-host resistance of wheat against oat crown rust

1990 ◽  
Vol 78 (4) ◽  
pp. 609-615 ◽  
Author(s):  
Bruno M. Moerschbacher ◽  
Ulrike Noll ◽  
Carlos A. Ocampo ◽  
Berenike E. Flott ◽  
Uwe Gotthardt ◽  
...  
Keyword(s):  
Host Resistance ◽  
Crown Rust ◽  
Oat Crown Rust

PARATHION, A SELECTIVE RUST FUNGICIDE, COMPARED WITH MANEB IN THE CONTROL OF CEREAL RUSTS

1968 ◽  
Vol 48 (3) ◽  
pp. 261-265
Author(s):  
G. Fleischmann ◽  
J. W. Martens ◽  
R. I. H. McKenzie
Keyword(s):  
Stem Rust ◽  
Field Tests ◽  
Crown Rust ◽  
Wheat Leaf Rust ◽  
Wheat Stem Rust ◽  
Oat Crown Rust ◽  
Wheat Leaf ◽  
Excellent Control ◽  
Significant Yield ◽  
Cereal Rusts

Parathion, an organophosphorus insecticide, controlled oat crown rust, Puccinia coronata Corda f. sp. avenae Erikss., in the greenhouse at a concentration of 0.32 g/liter when applied to oats before inoculation with rust urediospores. Slight reductions in the amount of oat stem rust, P. graminis Pers. f. sp. avenae Erikss. and Henn., wheat stem rust, P. graminis Pers. f. sp. tritici Erikss. and Henn., and wheat leaf rust, P. recondita Rob. ex. Desm., were achieved at higher concentrations. In field tests, three applications of parathion gave excellent control of oat crown rust. Late infections of oat stem rust, which caused significant yield reductions, were unaffected by parathion, but were effectively controlled by maneb.

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