scholarly journals Distribution of Pathotypes with Regard to Host Cultivars in French Wheat Leaf Rust Populations

2006 ◽  
Vol 96 (3) ◽  
pp. 264-273 ◽  
Author(s):  
Henriette Goyeau ◽  
Robert Park ◽  
Brigitte Schaeffer ◽  
Christian Lannou
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Wheat Leaf Rust ◽  
Seedling Resistance ◽  
Wheat Leaf ◽  
Selection For

Isolates of wheat leaf rust collected from durum and bread wheat cultivars in France during 1999-2002 were analyzed for virulence on 18 Thatcher lines with single genes for leaf rust resistance (Lr genes). Sampling focused on the five most widely grown bread wheat cultivars (two susceptible and three resistant) to allow statistical comparison of diversity indexes between the cultivars. Leaf rust populations from durum and bread wheats were different. The diversity of the bread wheat leaf rust pathotypes, as measured by the Shannon index, ranged from 2.43 to 2.76 over the 4 years. Diversity for wheat leaf rust resistance was limited in the host since we postulated only seven seedling resistance genes in the 35 cultivars most widely grown during 1999-2002. Leaf rust populations were strongly differentiated for virulence within bread wheat cultivars, and diversity was higher on those that were resistant, mainly due to a more even distribution of virulence phenotypes than on susceptible cultivars. The pathogen population on the susceptible cv. Soissons was largely dominated by a single pathotype (073100), whereas all other pathotypes virulent on cv. Soissons either decreased in frequency or remained at a low frequency during the period studied. Several pathotypes including the most complex one were found only on resistant cultivars, even though most of them were virulent on the susceptible cv. Soissons. Specific interactions were necessary, but not always sufficient, to account for pathotype distribution and frequencies on the cultivars, suggesting that selection for virulence to host resistance genes is balanced by other selective forces including selection for aggressiveness.

Analysis of Wheat Leaf Rust Resistance Genes in 14 Wheat Cultivars or Lines

2012 ◽  
Vol 37 (12) ◽  
pp. 2158-2166 ◽  
Author(s):  
Ya-Ya HU ◽  
Na ZHANG ◽  
Lin-Mao LI ◽  
Wen-Xiang YANG ◽  
Da-Qun LIU
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Wheat Leaf Rust ◽  
Wheat Leaf ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

scholarly journals Molecular identification of wheat leaf rust resistance genes in sixty Chinese wheat cultivars

2018 ◽  
Vol 54 (No. 1) ◽  
pp. 1-8
Author(s):  
Z. Ren ◽  
Z. Li ◽  
L. Shi ◽  
X. Wang ◽  
L. Zhu ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Cultivars ◽  
Wheat Leaf Rust ◽  
Progress Curve ◽  
Wheat Leaf ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

Common wheat (Triticum aestivum L.) is the major crop cultivated in Xinjiang and Anhui provinces of China. The climate in these two provinces is favourable for wheat leaf rust (Puccinia triticina) (Pt) infection. Here, we demonstrate a detailed investigation on the leaf rust resistance of 60 major wheat cultivars cultivated in these two regions. A mixture of high virulent Pt races (THTT, THTS, THTQ and PHPS) were used to phenotype all the collected wheat cultivars at an adult plant stage. Phenotypic disease severity (FDS) and the area under the disease progress curve (AUDPC) for each of these wheat cultivars were calculated. Among all the tested wheat cultivars, three cultivars (Xindong20, Xindong 29 and 99AR142-1) with the lowest FDS and AUDPC may carry major resistance genes. Twenty-seven cultivars (45% of the total tested ones) showed a relatively lower resistance with an average of 12.52% FDS and 126.3 AUDPC. Minor resistance or slow rusting genes may be present in this group of cultivars. Molecular markers for leaf rust resistance genes Lr1, Lr9, Lr19, Lr24, Lr26 and Lr34 were further used for the genotypic screening. Lr1, Lr19, Lr26 and Lr34 were detected in 19 (31.7%), 1 (1.7%), 12 (20%) and 6 (10%) wheat cultivars, respectively. Neither Lr9 nor Lr24 could be detected in any of the tested cultivars. These results will greatly improve wheat molecular breeding for leaf rust resistance in these areas.

scholarly journals Performance of Four New Leaf Rust Resistance Genes Transferred to Common Wheat from Aegilops tauschii and Triticum monococcum

Plant Disease ◽  
1997 ◽  
Vol 81 (6) ◽  
pp. 582-586 ◽  
Author(s):  
T. Hussien ◽  
R. L. Bowden ◽  
B. S. Gill ◽  
T. S. Cox ◽  
D. S. Marshall
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Aegilops Tauschii ◽  
Leaf Rust Resistance ◽  
Wheat Leaf Rust ◽  
Wheat Leaf ◽  
Moderately Resistant ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

The objective of this study was to test the performance of four new wheat leaf rust resistance genes previously transferred from wild relatives of common wheat. Leaf rust resistance gene Lr43, in wheat germplasm line KS92WGRC16, was originally from Aegilops tauschii. A second resistance gene, in line KS92WGRC23, was transferred from Triticum monococcum var. monococcum. Two other genes, in lines KS93U3 and KS96WGRC34, were obtained from T. monococcum var. boeoticum. In greenhouse tests, the typical low infection types produced by these lines were fleck (;), immune (0), fleck with chlorosis (;C), and heterogeneous (X-) for KS92WGRC16, KS92WGRC23, KS96WGRC34, and KS93U3, respectively. In field tests in Kansas and Texas, KS92WGRC23 and KS92WGRC16 were highly resistant. KS93U3 was moderately resistant in Kansas but moderately resistant to moderately susceptible in Texas. KS96WGRC34 was moderately resistant in Kansas but moderately resistant to susceptible in Texas. Greenhouse adult-plant tests with race PBJL of Puccinia recondita f. sp. tritici indicated that KS92WGRC16, KS92WGRC23, and KS96WGRC34 were highly resistant, but KS93U3 gave a moderately resistant reaction. Growth-chamber studies in different environments (12, 16, 20, and 24°C) showed slight temperature effects on the expression of resistance in KS96WGRC34 but not in the other lines. Tests with nine races of P. recondita f. sp. tritici indicated that only KS92WGRC16 was resistant to all the races. Races PNML and PNMQ were virulent on KS92WGRC23, and race TFGL was virulent on both KS93U3 and KS96WGRC34. The genes in the four germplasm lines should be used in combination with other resistance genes to prolong their usefulness.

Evaluation of Wheat Leaf Rust Resistance Genes in 10 Wheat Genotypes

2015 ◽  
Vol 122 (2) ◽  
pp. 91-99
Author(s):  
Xuejun Wei ◽  
Heshan Zhang ◽  
Dongdong Du ◽  
Wenxiang Yang ◽  
Daqun Liu
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Leaf Rust ◽  
Wheat Genotypes ◽  
Wheat Leaf ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

scholarly journals Physiologic Specialization of Puccinia triticina in Canada in 1998

Plant Disease ◽  
2001 ◽  
Vol 85 (2) ◽  
pp. 155-158 ◽  
Author(s):  
J. A. Kolmer
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Wheat Cultivars ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

In 1998, leaf rust of wheat (Triticum aestivum), caused by Puccinia triticina, was widespread throughout the prairies of western Canada. Warm summer temperatures with frequent dew periods favored spread of the disease in wheat fields in Manitoba and Saskatchewan. The Canada Prairie Spring wheat cultivars (AC Vista, AC Foremost, AC Crystal) were susceptible to leaf rust, while the bread wheat cultivars with leaf rust resistance genes Lr16 and Lr13 or Lr34 (AC Majestic, AC Domain, AC Barrie) had high to moderate levels of leaf rust infections. Bread wheat cultivars AC Cora, AC Minto, Pasqua, and McKenzie had trace to low levels of leaf rust infection. Thirty-four virulence phenotypes of P. triticina were identified on 16 Thatcher lines, which are near-isogenic for leaf rust resistance genes. Phenotypes with virulence to Lr16 increased to 25% of isolates in Manitoba and Saskatchewan in 1998. Forty-three isolates were also tested for virulence to plants with the adult plant resistance genes Lr12, Lr13, Lr34, and Lr13,34. Most isolates had virulence to Lr12 and Lr13. All isolates had lower infection type on adult plants with Lr34 compared with Thatcher.

scholarly journals Genetic analysis of leaf rust resistance in three common wheat cultivars MP 3288, HI 784 and HI 1418 under field conditions

2019 ◽  
Vol 79 (01) ◽  
Author(s):  
T. L. Prakasha ◽  
S. Chand ◽  
A. N. Mishra ◽  
K. S. Solanki ◽  
J. B. Singh ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Bread Wheat ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
The Other ◽  
Adult Plant ◽  
Wheat Cultivars ◽  
Seedling Resistance

This study aimed to investigate the genetic basis of leafrust resistance in three bread wheat cultivars viz., MP 3288, HI 1418 and HI 784 which have been maintaining high levels of resistance to leaf rust since their release in 2011, 2000, and 1983, respectively. These cultivars also possess leaf tip necrosis phenotype. These were crossed with a susceptible bread wheat cultivar Lal Bahadur and also among themselves in non-reciprocal manner.The F1 , F2 and F3 populations were raised and the inheritance of leaf rust resistance was studied using prevalent and highly virulent Puccinia triticina pathotype 77-5 (121R63-1) during 2014- 17. These studies showed that the field (adult-plant) resistance of these cultivars is governed by two dominant genes each. Closely linked molecular markers L34DINT9F and L34PLUSR revealed the presence of non-race specific adult-plant leaf rust resistance gene Lr34 in all cultivars of present study. Absence of the other documented race nonspecific APR genes viz., Lr46, Lr67 and Lr68 was indicated in all the three test cultivars based on genotyping with closely linked molecular markers WMC44, CFD71 and csgs, respectively. The other dominant gene appears to be an allstage resistance gene since all the three cultivars displayed high levels of seedling resistance to the test pathotype. Stable resistance of these cultivars could be due to synergistic/additive or complementary effects resulting from the combination of Lr34 and the all-stage resistance gene.

Alien genetic resources for wheat leaf rust resistance, cytogenetic transfer, and molecular analysis

2008 ◽  
Vol 59 (3) ◽  
pp. 197 ◽  
Author(s):  
B. S. Gill ◽  
L. Huang ◽  
V. Kuraparthy ◽  
W. J. Raupp ◽  
D. L. Wilson ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Common Wheat ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Wheat Leaf Rust ◽  
D Genome ◽  
Wheat Leaf ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

Wild relatives of wheat are useful sources of alien resistance genes for wheat breeding. The objective of this review is to document research on the evaluation, transfer, and molecular analysis of alien resistance to wheat leaf rust especially in Aegilops tauschii, the diploid D-genome donor of common wheat. Nine named resistance genes (Lr1, Lr2, Lr15, Lr21, Lr22, Lr32, Lr34, Lr39, and Lr42) occur in the D genome. Twelve new leaf rust resistance genes have been documented in Ae. tauschii. The south-west Caspian Sea region is the centre of genetic diversity for seedling resistance. Adult-plant resistance is widespread in all geographic regions and should be exploited more in the future. Lr1 and Lr21 have been cloned and are typical NBS-LRR genes. The recent documentation of cryptic introgressions of Lr57/Yr40 from Ae. geniculata and Lr58 from Ae. triuncialis offers exciting possibilities for transferring alien genes without linkage drag. Both Lr21 and Lr34 presumably arose during or following the origin of common wheat ~8000 years ago. Leaf rust resistance genes often are located towards the physical ends of wheat chromosomes. These regions are known to be high in recombination, and this may explain their rapid rate of evolution.

scholarly journals Race and Virulence Dynamics of Puccinia triticina in China During 2000–2006

Plant Disease ◽  
2012 ◽  
Vol 96 (11) ◽  
pp. 1601-1607 ◽  
Author(s):  
T. G. Liu ◽  
W. Q. Chen
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Code System ◽  
Wheat Leaf Rust ◽  
Wheat Leaf ◽  
Rust Resistance Genes ◽  
Leaf Rust Resistance Genes

Wheat leaf rust, caused by Puccinia triticina, is an important foliar disease of wheat in China. The dynamics of races and virulence in P. triticina populations in China during 2000 to 2006 were studied. Leaf rust samples were collected during surveys of wheat fields and trap nurseries in 16 provinces, and provided by coworkers throughout China. The virulence of single-pustule isolates was determined on near-isogenic Thatcher lines for leaf rust resistance genes Lr1, Lr2a, Lr2c, Lr3, Lr9, Lr16, Lr24, Lr26, Lr3ka, Lr11, Lr17, and Lr30, and races were denominated using the Prt code system. During 2000 to 2006, 79 races were identified from a total of 613 isolates. Races PHT (23.7%), THT (14.7%), PHJ (11.4%), and THJ (4.2%) were the four common races, all avirulent to Lr9 and Lr24. The frequency of isolates with virulence to Lr1, Lr2c, Lr3, Lr11, Lr16, Lr17, and Lr26 was over 80%, and these isolates were widely distributed in China, whereas the frequencies of virulence to Lr9, Lr19, Lr24, Lr25, Lr28, and Lr29 were 0.2 to 2.5%. The diversity of virulence phenotypes of Chinese P. triticina populations appeared to increase from 2000 to 2006. P. triticina races and virulences in China appear to be isolated from those in other countries.

Genetics of adult-plant leaf-rust resistance in four Indian and two Australian bread wheat cultivars

Genome ◽  
1994 ◽  
Vol 37 (3) ◽  
pp. 436-439 ◽  
Author(s):  
F Shiwani ◽  
R. G. Saini
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Resistance Genes ◽  
Plant Resistance ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Adult Plant ◽  
Wheat Cultivars ◽  
Partial Dominance

Genetic studies for leaf-rust resistance were conducted on four Indian (CPAN1235, HD2135, HP1209, and VL404) and two Australian (CSP44 and Oxley) bread wheat cultivars. The F2 and F3 plants from their crosses with each other and with susceptible cultivar Agra Local were tested against a mixture of pathotypes 77-1 and 77-2 (variants of race 77). Disease scores on F1's from resistant/susceptible parent crosses indicated partial dominance of resistance in these wheats. The six cultivars have two adult-plant resistance genes each. Their intercrosses revealed similar resistance gene(s) in CSP44 and Oxley, and CPAN1235 and HP1209. The six wheats appear to carry at least seven diverse leaf-rust resistance genes (temporarily named LrI to LrO) against pathotypes 77-1 + 77-2. Adult-plant resistance is additive and therefore the combinations of partially effective resistance genes identified in this study can provide higher levels of resistance. Because these genes are of hexaploid origin, they can be easily exploited in breeding programs. Furthermore, two or more resistance genes from the six wheat cultivars when combined with Lr34 are likely to impart durable resistance to leaf rust.Key words: adult-plant resistance, leaf-rust resistance, wheat, Puccinia recondita, Triticum aestivum.

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