scholarly journals Oat Lines with Effective Adult Plant Resistance to Crown Rust

Plant Disease ◽  
2002 ◽  
Vol 86 (6) ◽  
pp. 593-598 ◽  
Author(s):  
K. J. Leonard
Keyword(s):  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Specific Resistance ◽  
Field Tests ◽  
Field Resistance ◽  
Crown Rust ◽  
Adult Plant ◽  
Slow Rusting ◽  
Rust Severity ◽  
Field Plots

Race-specific resistance in oat does not provide adequate protection against crown rust because new virulent races of the pathogen often arise within a few years after cultivars with race-specific resistance are released. This study assessed levels of partial resistance in a series of experimental oat lines that showed reduced crown rust severity over 30 years of exposure to a diverse crown rust population. Oat breeding lines with putative adult plant slow-rusting resistance to Puccinia coronata were evaluated in small isolated field plots for crown rust severity in natural epidemics and in controlled inoculations in the greenhouse for infection efficiency with a single virulent P. coronata isolate. Lines were also tested as seedlings against isolates from a local P. coronata population to detect race-specific resistance. In field tests, areas under the disease progress curves for all 14 experimental lines tested were significantly less than for cv. Starter, the susceptible check, and values for nine of the lines were significantly less than for Portage, a standard slow-rusting cultivar. Four lines with good field resistance were susceptible as seedlings to >85% of the local P. coronata population. One of the lines, MN841801, remained relatively free of rust in field plots over 7 years of tests, even in the 3 years when Starter was destroyed by crown rust. In greenhouse inoculations, adult plants of MN841801 developed only 7% as many uredinia as Starter. MN841801 can be an excellent source of effective, durable adult plant resistance to crown rust.

ADULT PLANT RESISTANCE OF SOME OAT VARIETIES TO PHYSIOLOGIC RACES OF CROWN RUST

1944 ◽  
Vol 22c (6) ◽  
pp. 287-289 ◽  
Author(s):  
B. Peturson
Keyword(s):  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Crown Rust ◽  
Seedling Stage ◽  
Puccinia Coronata ◽  
Adult Plant ◽  
Adult Plant Stage ◽  
Plant Stage ◽  
Physiologic Races ◽  
Generalized Type

The reactions of five varieties of oats in the seedling and adult plant stages to seven physiologic races of crown rust, Puccinia coronata Corda var. Avenae Erikss. & Henn. were determined.All five varieties were completely susceptible in the seedling stage to all the races. Two varieties, Erban and Ajax, were resistant in the adult plant stage to some of the races and susceptible or moderately susceptible to others. Two other varieties, R.L. No. 1370 and R.L. No. 1510 were resistant in the adult plant stage to all the races used in this test, and apparently possess a generalized type of adult plant resistance to crown rust.

scholarly journals The Race-Specific Resistance Gene to Powdery Mildew, MlRE, Has a Residual Effect on Adult Plant Resistance of Winter Wheat Line RE714

1999 ◽  
Vol 89 (7) ◽  
pp. 533-539 ◽  
Author(s):  
N. Chantret ◽  
M. T. Pavoine ◽  
G. Doussinault
Keyword(s):  
Powdery Mildew ◽  
Resistance Genes ◽  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Specific Resistance ◽  
Residual Effect ◽  
Wheat Breeding ◽  
Adult Plant ◽  
Specific Gene ◽  
Dominant Type

Race-specific resistance genes to powdery mildew have been extensively used in wheat breeding programs, but the complete resistance they provide breaks down when confronted by pathogen isolates with matching virulence. However, when overcome, some race-specific genes have a residual action leading to a reduction of the symptoms. Our objective was to determine if the resistance genes MlRE and Pm4b have a residual effect on adult plant resistance (APR) and on vernalized seedling plant resistance (VPR) in the line RE714. Individuals from two populations (double haploid [DH] and F3 families) were genotyped for the race-specific genes MlRE and Pm4b and assessed for their resistance under field conditions at the adult plant stage (in 1996 and 1997 for the DH lines and in 1997 for the F3 families). Vernalized seedlings of the DH population were tested with four powdery mildew isolates. Only the MlRE gene had a significant effect (dominant type) on APR. Neither MlRE nor Pm4b had a significant effect on VPR. The dominant residual effect of the defeated race-specific gene MlRE was a component of APR in the line RE714.

Genetics of adult-plant resistance of leaf rust in 'Frontana' and three CIMMYT wheats

Genome ◽  
1992 ◽  
Vol 35 (1) ◽  
pp. 24-31 ◽  
Author(s):  
R. P. Singh ◽  
S. Rajaram
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Plant Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Field Resistance ◽  
Puccinia Recondita ◽  
Adult Plant ◽  
Leaf Rust Resistance Gene ◽  
Additive Genes

Wheat (Triticum aestivum L.) cultivar 'Frontana' and three globally leaf rust resistant CIMMYT spring bread wheats, 'Parula', 'Trap', and 'Mango', which displayed seedling susceptibility to Mexican pathotypes TCB/TD and (or) TBD/TM of Puccinia recondita f.sp. tritici and which displayed high levels of adult-plant resistance, were genetically analyzed. The four wheats were intercrossed and crossed with seedling and adult-plant susceptible cultivars 'Inia 66' or 'Yecora 70', and also with 'RL6058', a tester for leaf rust resistance gene Lr34. Adult-plant resistance to leaf rust appeared to be based on four additive genes in 'Frontana' and three additive genes in each of the other resistant wheats. Gene Lr34 was confirmed to be present in all four wheats and appeared to be important in conferring adult-plant resistance in conjunction with other partially effective adult-plant resistance genes. Some of these latter genes appeared to be common in the four wheats, since limited segregation occurred when intercrossed. Genes Lr3, Lr10, Lr13, and Lr26 appeared to be independent of the adult-plant resistance. The resistance is expected to be durable, since the source of Lr34 and the additional genes was traced to 'Frontana', which has retained its field resistance since its release in 1943.Key words: adult-plant resistance, genetics, Puccinia recondita f.sp. tritici, Triticum aestivum.

scholarly journals Durability of Adult Plant Resistance Gene Yr18 in Partial Resistance Behavior of Wheat (Triticum aestivum) Genotypes with Different Degrees of Tolerance to Stripe Rust Disease, Caused by Puccinia striiformis f. sp. tritici: A Five-Year Study

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2262
Author(s):  
Ghady E. Omar ◽  
Yasser S. A. Mazrou ◽  
Mohammad K. EL-Kazzaz ◽  
Kamal E. Ghoniem ◽  
Mammduh A. Ashmawy ◽  
...  
Keyword(s):  
Stripe Rust ◽  
Plant Resistance ◽  
Partial Resistance ◽  
Adult Plant Resistance ◽  
Puccinia Striiformis ◽  
Field Conditions ◽  
Adult Plant ◽  
Infection Frequency ◽  
Rust Disease ◽  
Slow Rusting

Adult plant resistance in wheat is an achievement of the breeding objective because of its durability in comparison with race-specific resistance. Partial resistance to wheat stripe rust disease was evaluated under greenhouse and field conditions during the period from 2016 to 2021. Misr 3, Sakha 95, and Giza 171 were the highest effective wheat genotypes against Puccinia striiformis f. sp. tritici races. Under greenhouse genotypes, Sakha 94, Giza 168, and Shandaweel1 were moderately susceptible, had the longest latent period and lowest values of the length of stripes and infection frequency at the adult stage. Partial resistance levels under field conditions were assessed, genotypes Sakha 94, Giza 168, and Shandaweel1 exhibited partial resistance against the disease. Leaf tip necrosis (LTN) was noted positively in three genotypes Sakha 94, Sakha 95, and Shandaweel1. Molecular analyses of Yr18 were performed for csLV34, cssfr1, and cssfr2 markers. Only Sakha 94 and Shandaweel1 proved to carry the Yr18 resistance allele at both phenotypic and genotypic levels. Scanning electron microscopy (SEM) observed that the susceptible genotypes were colonized extensively on leaves, but on the slow-rusting genotype, the pustules were much less in number, diminutive, and poorly sporulation, which is similar to the pustule of NIL Jupateco73 ‘R’.

Cytogenetical studies in wheat. XIV. Sr8b for resistance to Puccinia graminis tritici

1986 ◽  
Vol 28 (2) ◽  
pp. 189-197 ◽  
Author(s):  
R. P. Singh ◽  
R. A. McIntosh
Keyword(s):  
Key Words ◽  
Plant Resistance ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Field Tests ◽  
Gene Location ◽  
Adult Plant ◽  
Puccinia Graminis ◽  
Puccinia Graminis Tritici

A recessive, hemizygous-ineffective gene for resistance to Puccinia graminis tritici in 'Barleta Benvenuto', 'Klein Titan', and 'Klein Cometa' was located on chromosome 6AS, was genetically independent of the 6A centromere and failed to recombine with Sr8 (r < 0.3% at P = 0.05). It was therefore designated Sr8b. The gene formerly known as Sr8 was redesignated Sr8a. Sr8b conferred adult-plant resistance to the strains used for field tests. 'Klein Cometa' possessed a second gene in chromosome 5D; this was identified as Sr30.Key words: Puccinia, Triticum, gene location, linkage, wheat, cytogenetics, rust resistance.

Genetics of leaf-rust resistance in three spelt wheats

1994 ◽  
Vol 74 (2) ◽  
pp. 231-233 ◽  
Author(s):  
P. L. Dyck ◽  
E. E. Sykes
Keyword(s):  
Leaf Rust ◽  
Plant Resistance ◽  
Rust Resistance ◽  
Adult Plant Resistance ◽  
Leaf Rust Resistance ◽  
Field Resistance ◽  
Adult Plant ◽  
Seedling Resistance ◽  
Field Reaction ◽  
High Level

The inheritance of leaf-rust resistance was studied in three accessions of spelt wheat (Triticum aestivum ssp. spelta L.). Accession 7831 has a gene for seedling resistance to leaf rust that is linked with Lr33 (5.4 ± 1.05%), which is known to he on the long arm of chromosome 1B. This gene, which was either recessive or partially dominant, is designated Lr44, and because of its field reaction, should be useful in breeding rust-resistant wheats. Accession 7839 may also have this gene and an additional gene that in the seedling stage conditioned a type 2 infection to many races but little field resistance. Accessions 7831, 7839 and 7825 also have possibly in common a gene for adult-plant resistance. This gene, which did not give a high level of field resistance, was independent of Lr12, Lr13, Lr22, Lr34 and Lr35, other genes for adult-plant resistance. Key words:Triticum, wheat, leaf-rust resistance

scholarly journals Characterization of Novel Gene Yr79 and Four Additional Quantitative Trait Loci for All-Stage and High-Temperature Adult-Plant Resistance to Stripe Rust in Spring Wheat PI 182103

2018 ◽  
Vol 108 (6) ◽  
pp. 737-747 ◽  
Author(s):  
Junyan Feng ◽  
Meinan Wang ◽  
Deven R. See ◽  
Shiaoman Chao ◽  
Youliang Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Stripe Rust ◽  
Spring Wheat ◽  
Plant Resistance ◽  
Quantitative Trait ◽  
Adult Plant Resistance ◽  
Field Tests ◽  
Adult Plant ◽  
Wheat Cultivars ◽  
New Gene

Stripe rust, caused by Puccinia striiformis f. sp. tritici, is an important disease of wheat worldwide. Exploring new resistance genes is essential for breeding resistant wheat cultivars. PI 182103, a spring wheat landrace originally from Pakistan, has shown a high level of resistance to stripe rust in fields for many years, but genes for resistance to stripe rust in the variety have not been studied. To map the resistance gene(s) in PI 182103, 185 recombinant inbred lines (RILs) were developed from a cross with Avocet Susceptible (AvS). The RIL population was genotyped with simple sequence repeat (SSR) and single nucleotide polymorphism markers and tested with races PST-100 and PST-114 at the seedling stage under controlled greenhouse conditions and at the adult-plant stage in fields at Pullman and Mt. Vernon, Washington under natural infection by the stripe rust pathogen in 2011, 2012, and 2013. A total of five quantitative trait loci (QTL) were detected. QyrPI182103.wgp-2AS and QyrPI182103.wgp-3AL were detected at the seedling stage, QyrPI182103.wgp-4DL was detected only in Mt. Vernon field tests, and QyrPI182103.wgp-5BS was detected in both seedling and field tests. QyrPI182103.wgp-7BL was identified as a high-temperature adult-plant resistance gene and detected in all field tests. Interactions among the QTL were mostly additive, but some negative interactions were detected. The 7BL QTL was mapped in chromosomal bin 7BL 0.40 to 0.45 and identified as a new gene, permanently designated as Yr79. SSR markers Xbarc72 and Xwmc335 flanking the Yr79 locus were highly polymorphic in various wheat genotypes, indicating that the molecular markers are useful for incorporating the new gene for potentially durable stripe rust resistance into new wheat cultivars.

QTL mapping of slow-rusting, adult plant resistance to race Ug99 of stem rust fungus in PBW343/Muu RIL population

2013 ◽  
Vol 126 (5) ◽  
pp. 1367-1375 ◽  
Author(s):  
Sukhwinder Singh ◽  
Ravi P. Singh ◽  
Sridhar Bhavani ◽  
Julio Huerta-Espino ◽  
Lopez-Vera Eric Eugenio
Keyword(s):  
Qtl Mapping ◽  
Plant Resistance ◽  
Stem Rust ◽  
Adult Plant Resistance ◽  
Rust Fungus ◽  
Adult Plant ◽  
Slow Rusting ◽  
Ril Population
Sign in / Sign up

Export Citation Format

Share Document