Association between avenalumin accumulation, infection hypha length and infection type in oat crosses segregating for resistance to Puccinia coronata f.sp. avenae race 226

1995 ◽  
Vol 46 (4) ◽  
pp. 255-261 ◽  
Author(s):  
S. Mayama ◽  
A.P.A. Bordin ◽  
T. Morikawa ◽  
H. Tanpo ◽  
H. Kato
Keyword(s):  
Infection Type ◽  
Puccinia Coronata ◽  
Infection Hypha

scholarly journals Host Range and Alternate Host of a Puccinia coronata Population from Smooth Brome Grass

Plant Disease ◽  
2001 ◽  
Vol 85 (5) ◽  
pp. 513-516 ◽  
Author(s):  
N. J. Delgado ◽  
C. R. Grau ◽  
M. D. Casler
Keyword(s):  
Host Range ◽  
Agricultural Research ◽  
Infection Type ◽  
Disease Incidence ◽  
Puccinia Coronata ◽  
Grass Species ◽  
Research Station ◽  
Alternate Host ◽  
Smooth Brome ◽  
Brome Grass

A rust fungus was observed on smooth brome grass (Bromus inermis Leyss.) leaves growing in the fields of the University of Wisconsin (UW) Agricultural Research Station at Arlington, WI. The population (WPc-95A) was classified as Puccinia coronata Corda. Reports of P. coronata on B. inermis are rare, so a study of the pathogen host range, alternate host, and morphology of urediniospores and teliospores was undertaken. Fourteen grass species representing 10 genera were inoculated with P. coronata WPc-95A, which was maintained with repeated inoculations on B. inermis cv. PL-BDR1. Seventy-two 30-day-old seedlings of B. inermis were inoculated with urediniospores of the fungus. Infection type, pustule density, and disease incidence were recorded 15 days after inoculation. The same grass cultivars were also inoculated with aecio-spores collected from Rhamnus cathartica L. located on the UW campus. To test for host specificity, urediniospores produced on aeciospore-susceptible grass species were used to reinoculate plants of B. inermis and the host species from which the urediniospores were derived. B. inermis, B. riparius Rehm., Festuca pratensis Huds., and Lolium perenne L. were susceptible to P. coronata WPc-95A. The two Bromus spp. had the highest disease incidence. R. cathartica was found to be an alternate host of P. coronata WPc-95A, as it is for P. coronata isolates found on F. pratensis. However, cross-inoculations with urediniospores from R. cathartica-derived aeciospore infections indicated that only urediniospores of B. inermis origin were capable of infecting B. inermis. Thus, P. coronata WPc-95A appears to belong to a forma speciales previously undescribed in North America.

A single-spore analysis of rust pustules produced by mixing isolates of two races of Puccinia coronata var. avenue

1968 ◽  
Vol 46 (11) ◽  
pp. 1455-1458
Author(s):  
A. Dinoor ◽  
J. Khair ◽  
G. Fleischmann
Keyword(s):  
Infection Type ◽  
The Other ◽  
Puccinia Coronata ◽  
Masking Effect ◽  
Single Spore ◽  
New Race ◽  
Infection Types ◽  
Differential Varieties ◽  
Parent Race

Urediospores of pairs of isolates of Puccinia coronata var. avenae were simultaneously inoculated side by side on a susceptible oat leaf to produce a common pustule. The infection types of the culture from the single pustule, and from single-spore isolates of the pustule, were determined on key differential varieties distinguishing the component biotypes. The composition of the pustule was found to vary with the component races involved, and among pustules established from the same components.One pair of component races produced pustules which were phenotypically like one or the other of the isolates used in the mixture. Single-spore isolates from these pustules gave the same infection type as the pustule from which they were isolated, indicating that either one isolate alone produced the pustule, or that it predominated in what would then be a compound pustule.Another pair produced infection types unlike those of either parent race, and thus behaved phenotypically as a new race on the differential varieties. However, single-spore isolates from such pustules behaved as one or the other of the components. The masking effect of virulence over avirulence was also demonstrated by single-spore analysis of these compound pustules.

scholarly journals Virulence Variability of Puccinia coronata f. sp. avenae Isolates Collected in Three Counties from Rio Grande do Sul State, Brazil

Plant Disease ◽  
2007 ◽  
Vol 91 (1) ◽  
pp. 66-70 ◽  
Author(s):  
E. A. Vieira ◽  
F. I. F. Carvalho ◽  
M. S. Chaves ◽  
A. Costa de Oliveira ◽  
G. Benin ◽  
...  
Keyword(s):  
North American ◽  
Infection Type ◽  
Rio Grande ◽  
High Variability ◽  
Puccinia Coronata ◽  
Rio Grande Do Sul ◽  
American System ◽  
The North ◽  
High Infection ◽  
High Level

Using isolates collected in three counties of Rio Grande do Sul State, Brazil, the goals of this work were to determine (i) the pattern of virulence or avirulence of the isolates to 25 Pc resistance genes, (ii) the similarity in virulence among Puccinia coronata f. sp. avenae isolates considering their pattern of virulence or avirulence, (iii) the race code for each isolate by the North American system of nomenclature, and (iv) the supplemental Pc genes potentially useful as local differentials for P. coronata f. sp. avenae races. The results indicate that the southern Brazilian rust isolates presented a high level of virulence, because 66% of inoculations manifested the high infection type. Only the Pc 68 gene was effective against all tested isolates. In general, each isolate presented a different pattern of virulence or avirulence, which indicates the high variability for virulence that the fungus presents at the sampled sites. However, the North American system of nomenclature was not completely sufficient in distinguishing southern Brazilian races. Thus, the genes Pc 36, Pc 53, Pc 55, and Pc 63 represent a possible gene combination to be incorporated into the North American system of nomenclature.

Diversity for virulence in a sexually reproducing population of Puccinia coronata

1987 ◽  
Vol 65 (5) ◽  
pp. 994-998 ◽  
Author(s):  
S. M. Al-Kherb ◽  
A. P. Roelfs ◽  
J. V. Groth
Keyword(s):  
Infection Type ◽  
Sampling Period ◽  
Wiener Index ◽  
Puccinia Coronata ◽  
Host Responses ◽  
Regression Analyses ◽  
Type Classes ◽  
Oat Cultivars ◽  
The Mean ◽  
Index Of Diversity

Diversity for virulence in a sexually reproducing population of Puccinia coronata Cda. was studied among isolates collected at three distances from a buckthorn hedge at six sampling periods during the summer. Among 360 isolates, 155 distinct phenotypes were identified on 28 differential oat cultivars. About 60% of the phenotypes were represented by a single isolate. The number of phenotypes found decreased with time and distance from the hedge. Host responses were classified into low (0 and 0;), intermediate (1 and 2), and high (3 and 4) infection type classes. The Shannon–Wiener index of diversity decreased with distance from the buckthorn hedge from 2.58 at the 1-m site to 1.35 at the 10-m site and decreased with time from 3.42 in the second to 2.71 in the sixth sampling period. The mean number of virulence differences among phenotypes in each collection ranged from 4 to 12 with 28 hosts. Both distance and time contributed significantly to the decrease in Shannon–Wiener index and number of phenotypes in multiple regression analyses.

scholarly journals Quantitative Trait Loci in the Ogle/TAM O-301 Oat Mapping Population Controlling Resistance to Puccinia coronata in the Field

2010 ◽  
Vol 100 (5) ◽  
pp. 484-492 ◽  
Author(s):  
E. W. Jackson ◽  
D. E. Obert ◽  
J. B. Avant ◽  
S. A. Harrison ◽  
J. Chong ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Mapping Population ◽  
Infection Type ◽  
Crown Rust ◽  
Puccinia Coronata ◽  
Effective Control ◽  
Single Marker Analysis ◽  
Genetic Region ◽  
Trait Loci

Crown rust is the most damaging disease of cultivated oat (Avena sativa) and genetic resistance is the primary means of controlling the disease. Quantitative trait loci (QTL) with major and minor effects have been identified in Ogle1040 and TAM O-301 (most notably, Pc58 and PcNQMG/LGCG from TAM O-301 and OT-27 from Ogle1040) through single-isolate greenhouse and field tests. To map loci and determine the effectiveness of previously identified QTL against naturally occurring pathogen populations in highly disease-conducive environments, the Ogle/TAM O-301 (OT) recombinant inbred line (RIL) population was grown in Texas and Louisiana over 2 years and in Manitoba, Canada. The genetic region characterized by the Pc58 resistance gene complex, particularly Pc58a, accounted for most of the diseased leaf area (DLA) and infection type (IT) variance in all five experiments. Additionally, the genetic region characterized by PcNQMG/LGCG accounted for a portion of the IT variance in three experiments. Although no QTL was detected on OT-27 in this study, all the markers on this linkage group were associated (P < 0.0001) with reducing both IT and DLA using single-marker analysis. Screening with 25 Puccinia coronata isolates from six different states indicated that Pc58abc and Pc58a were highly effective, while characterization using F2 populations derived from OT RILs containing the two main genetic regions responsible for crown rust resistance in TAM O-301 (Pc58 and PcNQMG/LGCG) and a minor QTL in Ogle (OT-27) indicated that Pc58a, in combination with a locus in Ogle1040, provided high levels of resistance to natural races in Texas. This study provides new information and key loci in OT mapping population and may be useful for effective control of crown rust in North America.

Infection Type Should Dictate Antibiotic Choice

2005 ◽  
Vol 36 (6) ◽  
pp. 22
Author(s):  
DAMIAN MCNAMARA
Keyword(s):  
Infection Type
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