Slow rusting and tolerance to rusts in wheat. II. The progress and effects of epidemics in Puccinia recondita tritici in selected wheat cultivars

1979 ◽  
Vol 30 (3) ◽  
pp. 421 ◽  
Author(s):  
RG Rees ◽  
JP Thompson ◽  
EA Goward
Keyword(s):  
Leaf Rust ◽  
Pattern Analysis ◽  
Puccinia Recondita ◽  
Wheat Cultivars ◽  
Slow Rusting ◽  
Puccinia Recondita Tritici

The progress and effects of epidemics of leaf rust (Puccinia recondita Rob, ex Desm. f, sp. tritici Erikss. & Henn.) have been examined in 45 wheat cultivars over two seasons. The epidemics in each cultivar were compared by various measures and by pattern analysis. The cultivars were separated into groups ranging from highly resistant to highly susceptible with intermediate groups possessing various levels of slow-rusting ability. Cvv. Hopps, Warchief, Huguenot, Pusa 80-5c, Dural, Warput, Koolisie and Puglu were found to possess useful levels of slow-rusting ability. Fast rusting was conspicuous in Gabo and its derivatives Mendos, Mengavi, Gamenya and Gamut. The desirability of not perpetuating this defect is discussed.

Control of wheat leaf rust with 4-n-butyl-1,2,4-triazole

1975 ◽  
Vol 15 (73) ◽  
pp. 276 ◽  
Author(s):  
RG Rees ◽  
GJ Platz
Keyword(s):  
Leaf Rust ◽  
Field Experiments ◽  
Puccinia Recondita ◽  
Wheat Leaf Rust ◽  
Yield Increase ◽  
Boot Stage ◽  
Crop Development ◽  
Wheat Leaf ◽  
Puccinia Recondita Tritici ◽  
Excellent Control

The control of wheat leaf rust (Puccinia recondita tritici) by seed or foliar applications of 4-n-butyl-l,2,4-triazole (RH-124) has been examined in field experiments over three years at Gatton, Queensland. Single foliar sprays of RH-124 at rates as low as 100 g a.i, ha-1 have given excellent control of leaf rust. One such spray resulted in a yield increase of 30 per cent. A spray at 400 g a.i. ha-1 increased yield by 46 per cent compared with an increase of 61 per cent in the rust-free reference. Applications around the early boot stage of crop development were the most effective. Treatment of seed with RH-124 resulted in some control of leaf rust in one season with an associated yield increase of 22 per cent. Although RH-124 appears promising, additional studies are required before use of the fungicide on commercial wheat crops would be accepted.

Slow rusting and tolerance to rusts in wheat I. The progress and effects of epidemics of Puccinia graminis tritici in selected wheat cultivars

1979 ◽  
Vol 30 (3) ◽  
pp. 403 ◽  
Author(s):  
RG Rees ◽  
JP Thompson ◽  
RJ Mayer
Keyword(s):  
Infection Rate ◽  
Pattern Analysis ◽  
Grain Filling ◽  
Disease Assessment ◽  
Tolerance Index ◽  
Puccinia Graminis ◽  
Wheat Cultivars ◽  
Vertical Resistance ◽  
Slow Rusting ◽  
Progress Curve

The effectiveness of vertical resistance to rusts in wheat as generally employed is short-lived and a more durable form of resistance is required. To examine slow rusting and tolerance, the progress and effects of epidemics of stem rust (Puccinia graminis Pers, f. sp. tritici Erikss. & Henn.) in 45 wheat cultivars have been followed during two seasons. The epidemics in each cultivar have been compared by means of the average disease assessment, area below the disease progress curve, apparent infection rate, and intercept of the logit line, and by pattern analysis. Of these measures, the infection rate was the least valuable, whilst pattern analysis allowed useful grouping of cuItivars with similar epidemic patterns. The cultivars were arrayed on a resistance spectrum and ranged from highly resistant to extremely susceptible, those between possessing various levels of slow-rusting ability. Slow rusting was at a comparatively high level in cvv. Hopps, Dural, Lawrence and Celebration. In contrast cv. Mengavi was shown to be a fast ruster. The danger of developing cultivars, such as Mengavi, with a fast-rusting tendency masked by initially effective vertical resistance is discussed. The effects of the epidemics in each cultivar have also been determined to provide a tolerance index. The percentage reduction in grain-filling period, the logit-line intercept value and the delay to 10% disease relative to a susceptible reference cultivar were the main factors associated with the effect of the epidemics on grain yield.

Complementary genes for reaction to Puccinia recondita tritici in Triticum aestivum. II. Cytogenetic studies

1984 ◽  
Vol 26 (6) ◽  
pp. 736-742 ◽  
Author(s):  
R. P. Singh ◽  
R. A. McIntosh
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Puccinia Recondita ◽  
Monosomic Analysis ◽  
Complementary Genes ◽  
Cytogenetic Studies ◽  
Puccinia Recondita Tritici

Two complementary genes, A and B, conferring resistance to Puccinia recondita tritici in various wheats were located in chromosomes 4Aβ and 3BS, respectively. In one study gene B showed recombination of 33.6 ± 4.1% with the centromere, and was independent in a second study. Gene B was the same as that designated Lr27. A new designation, Lr31, is proposed for gene A. Both Lr27 and Lr31 must be present for the expression of resistance.Key words: leaf rust, monosomic analysis, aneuploids, wheat.

Number of genes controlling slow rusting resistance to leaf rust in five spring wheat cultivars

2004 ◽  
Vol 145 (1) ◽  
pp. 91-94 ◽  
Author(s):  
M K DAS ◽  
S RAJARAM ◽  
C C MUNDT ◽  
W E KRONSTAD
Keyword(s):  
Leaf Rust ◽  
Spring Wheat ◽  
Wheat Cultivars ◽  
Slow Rusting ◽  
Number Of Genes

Slow leaf rust development on durum wheat

1977 ◽  
Vol 55 (11) ◽  
pp. 1539-1543 ◽  
Author(s):  
G. D. Statler ◽  
J. T. Nordgaard ◽  
J. E. Watkins
Keyword(s):  
Durum Wheat ◽  
Leaf Rust ◽  
Bread Wheat ◽  
Infection Rate ◽  
Wheat Cultivar ◽  
Wheat Cultivars ◽  
Bread Wheat Cultivar ◽  
Slow Rusting ◽  
Apparent Infection Rate ◽  
Rust Severity

Several durum wheat (Triticitm durum) cultivars exhibiting susceptible or moderately susceptible reactions to the leaf rust fungus (Puccinia recondita tritici) were evaluated for slow rusting. Percentage severity and reactions for P. recondita tritici on each cultivar were evaluated periodically after initial infection. Logit analysis of disease progress curves was used to compare cultivars. The durum wheats consistently exhibited low rust severities in the field. The durums were always characterized by lower infection rates than the susceptible bread wheat cultivar Thatcher (Triticum aestivum). The area under the disease progress curve was smaller for the durum wheats than for Thatcher. The high correlation between apparent infection rate and the final rust severity indicated that final rust severity could be used as an indication of infection rate. The high correlation coefficient for the apparent infection rate between the two top leaves indicated that either leaf would provide an accurate evaluation of the cultivar. Yields of the durum wheat cultivars were not increased by controlling leaf rust. Yields of the susceptible bread wheat cultivar Thatcher were significantly increased by controlling leaf rust. The slow rusting displayed by the durum wheat cultivars studied apparently provide adequate protection against leaf rust under North Dakota conditions.

INHERITANCE OF LEAF RUST RESISTANCE IN WHEAT CULTIVARS RAFAELA AND EAP 26127 AND CHROMOSOME LOCATION.OF GENE Lr17

1977 ◽  
Vol 19 (2) ◽  
pp. 355-358 ◽  
Author(s):  
P. L. Dyck ◽  
E. R. Kerber
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Wheat Cultivars ◽  
Seedling Resistance

The inheritance of seedling resistance to leaf rust (Puccinia recondita) was studied in wheat (Triticum aestivum L.) cultivars Rafaela and EAP 26127. Rafaela has genes Lr14b and Lr17 while EAP 26127 has Lr17. Lr17 was located on chromosome 2A, possibly the short arm, and was independent of Lr11.

scholarly journals Seedling and Slow Rusting Resistance to Leaf Rust in Chinese Wheat Cultivars

Plant Disease ◽  
2010 ◽  
Vol 94 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Z. F. Li ◽  
X. C. Xia ◽  
Z. H. He ◽  
X. Li ◽  
L. J. Zhang ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Slow Rusting ◽  
Cropping Seasons ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

Identification of resistance genes is important for developing leaf rust resistant wheat (Triticum aestivum) cultivars. A total of 102 Chinese winter wheat cultivars and advanced lines were inoculated with 24 pathotypes of Puccinia triticina for postulation of leaf rust resistance genes effective at the seedling stage. These genotypes were also planted in the field for characterization of slow rusting responses to leaf rust in the 2006–07 and 2007–08 cropping seasons. Fourteen leaf rust resistance genes—Lr1, Lr2a, Lr3bg, Lr3ka, Lr14a, Lr16, Lr17a, Lr18, Lr20, Lr23, Lr24, Lr26, Lr34, and LrZH84—either singly or in combinations, were postulated in 65 genotypes, whereas known resistance genes were not identified in the other 37 accessions. Resistance gene Lr26 was present in 44 accessions. Genes Lr14a and Lr34 were each detected in seven entries. Lr1 and Lr3ka were each found in six cultivars, and five lines possessed Lr16. Lr17a and Lr18 were each identified in four lines. Three cultivars were postulated to possess Lr3bg. Genes Lr20, Lr24, and LrZH84 were each present in two cultivars. Each of the genes Lr2a and Lr23 may exist in one line. Fourteen genotypes showed slow leaf rusting resistance in two cropping seasons.

scholarly journals Número de genes involucrados en el desarrollo lento de la Roya de la Hoja (Puccinia recondita f. sp. Tritici) en trigo

1999 ◽  
Vol 3 (1) ◽  
pp. 25
Author(s):  
Luis Fernando Campuzano Duque
Keyword(s):  
Leaf Rust ◽  
Block Design ◽  
Genetic Resistance ◽  
Leaf Rust Resistance ◽  
Puccinia Recondita ◽  
Wheat Varieties ◽  
Slow Rusting ◽  
Progress Curve ◽  
Randomized Block Design ◽  
Number Of Genes

<p>Con el fin de determinar el número de genes involucrados en el tipo de resistencia de desarrollo lento de la roya de la hoja en las variedades de trigo Pavón 76,Hermosillo 77 y Nacozari 76, se realizó un estudio en el Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) localizado en Texcoco, Estado de Méjico. Para el efecto, se obtuvieron las cruzas simples posibles de estas tres variedades con una variedad susceptible carente de genes de resistencia, denominada Jupateco 73<sup>S</sup>. Los progenitores y 74 familias F<sub>5</sub>, de cada una de las seis cruzadas, fueron sembradas en un diseño de bloques completos aI azar con un arreglo de parcelas divididas con tres repeticiones. La respuesta a la enfermedad en las familias F<sub>5</sub>, se evaluó calculando el Área Bajo la Curva de Progreso de la Roya de la Hoja (ABCPRH). El estudio genético se realizó mediante el análisis dialélico de Griffing, (1986) (Modelo 2, Método 4), a partir del cual se estimaron las varianzas requeridas para calcular el número de genes involucrados en cada cruza mediante la fórmula de Wright, (1968). La resistencia genética a la roya de la hoja fue controlada por dos genes en las variedades Pavón 76 y Hermosillo 77 y por tres genes en Nacozari 76, sobre la base de que Jupateco 73<sup>S</sup> no posee genes efectivos de resistencia.</p><p> </p><p><strong>Number of genes involved in slow-rusting to leaf rust (Puccinia recondita f. sp. tritici) in wheat.</strong></p><p> In order to determine the number of genes involved in the type of leaf rust resistance called "slow rusting" in Pavón76, Hermosillo 77 and Nacozari 76 wheat varieties a study was carried out at the International Maize and Wheat Improvement Center (CIMMYT) located in Texcoco, State of Mexico. All possible single crosses were entered into these three varieties with a susceptible lacking variety genes resistance called Jupateco 73<sup>S</sup>.Parents and 74 F<sub>5</sub> families of each cross were planted in a split plot randomized block design with three replications. The disease was evaluated using the Area Under the Leaf Rust Progress Curve (AULRPC). The genetic studies were achieved according to the model 2 Method 4 of Griffing,(1956) aiming the required variances to calculate the number of genes involved in each cross, according to Wright's (1968) formula. The leaf rust genetic resistance was controlled by two genes in Pavón76 and Hermosillo 77 varieties and by three genes in Nacozari 76, based on Jupateco 73<sup>S</sup> does not possess effective genes of resistance.</p>

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