scholarly journals Efficacy of plant extracts in controlling wheat leaf rust disease caused by Puccinia triticina

2017 ◽  
Vol 4 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Yasser M. Shabana ◽  
Mohamed E. Abdalla ◽  
Atef A. Shahin ◽  
Mohammed M. El-Sawy ◽  
Ibrahim S. Draz ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Plant Extracts ◽  
Puccinia Triticina ◽  
Wheat Leaf Rust ◽  
Rust Disease ◽  
Wheat Leaf

Virulence and molecular polymorphisms of the wheat leaf rust fungus Puccinia triticina in Canada from 1997 to 2007

Botany ◽  
2010 ◽  
Vol 88 (6) ◽  
pp. 575-589 ◽  
Author(s):  
Xiben Wang ◽  
Guus Bakkeren ◽  
Brent McCallum
Keyword(s):  
Leaf Rust ◽  
Expressed Sequence Tag ◽  
Rust Fungus ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Significant Shift ◽  
Wheat Leaf Rust ◽  
Rust Disease ◽  
The Pacific ◽  
Wheat Leaf

Populations of Puccinia triticina , one of the casual agents of wheat leaf rust disease, in the pacific (British Columbia and Alberta), prairie (Manitoba and Saskatchewan), and eastern regions (Quebec and Ontario) of Canada from 1997 to 2007 were analyzed for virulence and genetic diversity by revealing expressed sequence tag derived simple sequence repeat (EST-SSR) polymorphisms. Since 1997, a significant shift in the virulence of P. triticina occurred across Canada. The diversity of P. triticina virulence phenotypes in Manitoba and Saskatchewan, as measured by Shannon and Simpson indexes, decreased due to the directional selection toward predominant virulence phenotypes, whereas it remained relatively constant in Quebec and Ontario. The clustering of P. triticina virulence phenotypes from 1997 to 2007 was similar to that found in previous years, and was correlated with virulence to leaf rust resistance genes Lr2a, Lr2c, and Lr17a. Distinct EST-SSR profiles were found in different groups of P. triticina virulence phenotypes based on virulence to Lr2a, Lr2c, and Lr17a. In addition, the population of P. triticina in Manitoba and Saskatchewan was different from that in Quebec and Ontario from 1997 to 2007, based on both virulence characteristics and EST-SSR genotypes.

scholarly journals Geographical Distribution of Physiologic Races of Puccinia triticina and Postulation of Resistance Genes in New Wheat Cultivars in Egypt

2012 ◽  
Vol 1 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Nour E. K. Soliman ◽  
Ashraf M. M. Abdelbacki ◽  
Mohammad A.A. Najeeb ◽  
Reda I. Omara
Keyword(s):  
Leaf Rust ◽  
Geographical Distribution ◽  
Resistance Genes ◽  
Puccinia Triticina ◽  
Wheat Cultivars ◽  
Wheat Leaf Rust ◽  
Rust Disease ◽  
Lr Genes ◽  
Wheat Leaf ◽  
Physiologic Races

Knowledge of the geographical distribution for physiologic races of Puccinia triticina and identification of leaf rust resistance genes (Lr ,s) in the recent Egyptian wheat cultivars are essential for maximizing resistance in future-bred cultivars. The  aim   of   this   study   was   to   know   the   status  of resistance in Egyptian wheat cultivars against wheat leaf rust and the most frequent race distributed. Infected samples were collected from five Governorates, i.e.,  Dakahlia,  Kafr el-Sheikh,  Beheira,  Sharqia  and  Sohag comprised the wheat growing area in Egypt. These samples were isolated, purified and identified on the differential stes. Gene postulation was done using fifteen identified races on Egyptian wheat cultivars correlated with Lr genes. Thirty three races identified during three seasons 2009/2010, 2010/2011 and 2011/2012. The most frequent race was TK (10%) followed by race BB (7.58%), PK (6.55%), TT (4.82%), PT (3.79%) and MT (3.44%). Moreover, races; BB, TT and PT were present during three seasons while these races appeared in some Governorates and disappeared in other Governorates. On the other hand, the most frequently occurring gene in ten Egyptian wheat cultivars was Lr35 (70%), followed by Lr22 (60%), Lr27 (40%), Lr34 (30%), Lr19 (30%),Lr18 (10%),Lr36 (10%) and Lr46 (10%), eight out of sixteen Lr genes were not present in the tested cultivars. It is concluded that there was a good variation in Lr genes carried by wheat cultivars commercially grown in Egypt. Therefore, strategies for deploying resistance genes to prolong effective disease resistance are suggested to control wheat leaf rust disease.

scholarly journals A Chromosome-Scale Assembly of the Wheat Leaf Rust Pathogen Puccinia triticina Provides Insights Into Structural Variations and Genetic Relationships With Haplotype Resolution

2021 ◽  
Vol 12 ◽  
Author(s):  
Jing Qin Wu ◽  
Long Song ◽  
Yi Ding ◽  
Chongmei Dong ◽  
Mafruha Hasan ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Molecular Mechanisms ◽  
Genetic Relationships ◽  
Durable Resistance ◽  
Puccinia Triticina ◽  
Wheat Leaf Rust ◽  
Structural Variations ◽  
Rust Disease ◽  
Rust Pathogen ◽  
Wheat Leaf

Despite the global economic importance of the wheat leaf rust pathogen Puccinia triticina (Pt), genomic resources for Pt are limited and chromosome-level assemblies of Pt are lacking. Here, we present a complete haplotype-resolved genome assembly at a chromosome-scale for Pt using the Australian pathotype 64-(6),(7),(10),11 (Pt64; North American race LBBQB) built upon the newly developed technologies of PacBio and Hi-C sequencing. PacBio reads with ∼200-fold coverage (29.8 Gb data) were assembled by Falcon and Falcon-unzip and subsequently scaffolded with Hi-C data using Falcon-phase and Proximo. This approach allowed us to construct 18 chromosome pseudomolecules ranging from 3.5 to 12.3 Mb in size for each haplotype of the dikaryotic genome of Pt64. Each haplotype had a total length of ∼147 Mb, scaffold N50 of ∼9.4 Mb, and was ∼93% complete for BUSCOs. Each haplotype had ∼29,800 predicted genes, of which ∼2,000 were predicted as secreted proteins (SPs). The investigation of structural variants (SVs) between haplotypes A and B revealed that 10% of the total genome was spanned by SVs, highlighting variations previously undetected by short-read based assemblies. For the first time, the mating type (MAT) genes on each haplotype of Pt64 were identified, which showed that MAT loci a and b are located on two chromosomes (chromosomes 7 and 14), representing a tetrapolar type. Furthermore, the Pt64 assembly enabled haplotype-based evolutionary analyses for 21 Australian Pt isolates, which highlighted the importance of a haplotype resolved reference when inferring genetic relationships using whole genome SNPs. This Pt64 assembly at chromosome-scale with full phase information provides an invaluable resource for genomic and evolutionary research, which will accelerate the understanding of molecular mechanisms underlying Pt-wheat interactions and facilitate the development of durable resistance to leaf rust in wheat and sustainable control of rust disease.

scholarly journals Potential of some plant extracts in controlling wheat leaf rust caused by Puccinia triticina Eriks.

2018 ◽  
Vol 2 (1) ◽  
pp. 66-67
Author(s):  
Amal Elkhwaga ◽  
Abdelnaser Elzaawely ◽  
Ibrahim Draz ◽  
Abdelwahab Ismail ◽  
Hassan El-Zahaby
Keyword(s):  
Leaf Rust ◽  
Plant Extracts ◽  
Puccinia Triticina ◽  
Wheat Leaf Rust ◽  
Wheat Leaf

scholarly journals Effect of Resistance Inducing Chemicals on Wheat Leaf Rust Caused by Puccinia triticina

2013 ◽  
Vol 41 (2) ◽  
pp. 121-133
Author(s):  
Nour El-Din Soliman ◽  
Magdy Saber ◽  
Alaa Abd-Elaziz ◽  
Ibrahim Imbabi
Keyword(s):  
Leaf Rust ◽  
Puccinia Triticina ◽  
Wheat Leaf Rust ◽  
Wheat Leaf

scholarly journals Physiologic Specialization of Puccinia triticina on Wheat in the United States in 2002

Plant Disease ◽  
2004 ◽  
Vol 88 (10) ◽  
pp. 1079-1084 ◽  
Author(s):  
J. A. Kolmer ◽  
D. L. Long ◽  
M. E. Hughes
Keyword(s):  
United States ◽  
Leaf Rust ◽  
Great Plains ◽  
Puccinia Triticina ◽  
The United States ◽  
Wheat Leaf Rust ◽  
Ohio Valley ◽  
Virulence Phenotype ◽  
Common Phenotype ◽  
Wheat Leaf

Collections of Puccinia triticina were obtained from rust-infected wheat leaves by cooperators throughout the United States and from surveys of wheat fields and nurseries in the Great Plains, Ohio Valley, Southeast, California, and the Pacific Northwest, in order to determine the virulence of the wheat leaf rust fungus in 2002. Single uredinial isolates (785 in total) were derived from the wheat leaf rust collections and tested for virulence phenotype on lines of Thatcher wheat that are near-isogenic for leaf rust resistance genes Lr1, Lr2a, Lr2c, Lr3, Lr9, Lr16, Lr24, Lr26, Lr3ka, Lr11, Lr17, Lr30, LrB, Lr10, Lr14a, and Lr18. In the United States in 2002, 52 virulence phenotypes of P. triticina were found. Virulence phenotype MBDS, which is virulent to resistance gene Lr17, was the most common phenotype in the United States. MBDS was found in the Southeast, Great Plains, and the Ohio Valley regions, and also in California. Phenotype MCDS, virulent to Lr17 and Lr26, was the second most common phenotype and occurred in the same regions as MBDS. Virulence phenotype THBJ, which is virulent to Lr16 and Lr26, was the third most common phenotype, and was found in the southern and northern central Great Plains region. Phenotype TLGJ, with virulence to Lr2a, Lr9, and Lr11, was the fourth most common phenotype and was found primarily in the Southeast and Ohio Valley regions. The Southeast and Ohio Valley regions differed from the Great Plains regions for predominant virulence phenotypes, which indicate that populations of P. triticina in those areas are not closely connected. The northern and southern areas of the Great Plains were similar for frequencies of predominant phenotypes, indicating a strong south to north migration of urediniospores.

scholarly journals Induction of the defence responses and resistance to wheat leaf rust by plant extracts

2009 ◽  
Vol 75 (2) ◽  
pp. 431
Author(s):  
M.E. Cawood ◽  
J.C. Pretorius ◽  
A.J. Van der Westhuizen
Keyword(s):  
Leaf Rust ◽  
Plant Extracts ◽  
Wheat Leaf Rust ◽  
Wheat Leaf ◽  
Defence Responses

Generation of a wheat leaf rust, Puccinia triticina, EST database from stage-specific cDNA libraries

2007 ◽  
Vol 8 (4) ◽  
pp. 451-467 ◽  
Author(s):  
GUANGGAN HU ◽  
ROB LINNING ◽  
BRENT MCCALLUM ◽  
TRAVIS BANKS ◽  
SYLVIE CLOUTIER ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Puccinia Triticina ◽  
Cdna Libraries ◽  
Wheat Leaf Rust ◽  
Est Database ◽  
Wheat Leaf
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