scholarly journals Priming Is a Suitable Strategy to Enhance Resistance Towards Leaf Rust in Barley

2019 ◽  
Vol 3 (1) ◽  
pp. 46-51 ◽  
Author(s):  
Gwendolin Wehner ◽  
Doris Kopahnke ◽  
Klaus Richter ◽  
Steffen Kecke ◽  
Adam Schikora ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Infection Type ◽  
Homoserine Lactone ◽  
Negative Control ◽  
Puccinia Hordei ◽  
Resistance Level ◽  
Biotic Stresses ◽  
First Results ◽  
Meliloti Strain ◽  
Open Access Article

Priming allows plants to respond faster and stronger to abiotic or biotic stresses. Leaf rust (Puccinia hordei) is an important pathogen of barley (Hordeum vulgare), for which resistance genes are known, but mostly overcome. Therefore, the aims of this study were (i) to establish a priming system in barley, based on bacterial N-acyl homoserine lactone (AHL), and (ii) to get information on the effect of priming on the reaction to leaf rust. Plants were inoculated with bacteria, i.e., Ensifer meliloti with repaired expR copy, producing the oxo-C14-homoserine lactone (AHL) and an E. meliloti strain carrying the attM lactonase gene from Agrobacterium tumefaciens, which cleaves the AHL and acts here as negative control. After three bacterial inoculations, plants were challenged with P. hordei strain I-80 at the three leaves stage. Twelve days after infection, scoring of the leaf area diseased and the infection type was conducted followed by the calculation of the relative susceptibility. First results indicate a significantly (P < 0.001) higher resistance level to P. hordei after inoculation with E. meliloti. Furthermore, significant (P < 0.001) differences were detected between the accessions tested for priming efficiency, which can be the basis to screen a larger set of barley accessions to detect quantitative trait loci or candidate genes involved in priming. [Formula: see text] Copyright © 2019 The Author(s). This is an open access article distributed under the CC BY 4.0 International license .

Early abortion of colonies of leaf rust, Puccinia hordei, in partially resistant barley seedlings

1982 ◽  
Vol 60 (5) ◽  
pp. 714-723 ◽  
Author(s):  
R. E. Niks
Keyword(s):  
Leaf Rust ◽  
Infection Type ◽  
Durable Resistance ◽  
Infection Process ◽  
Host Cells ◽  
Puccinia Hordei ◽  
Pr Genes ◽  
Mother Cells ◽  
Early Abortion ◽  
Barley Genotypes

Partial resistance (PR) in barley to leaf rust is assumedly a case of durable resistance. PR is characterized by a reduced rate of epidemic development in spite of a susceptible infection type. One of the components of PR, low infectibility, was studied histologically by means of fluorescence microscopy. Quantitative analyses of the phases of the infection process beyond appressorium formation showed that the reduced infectibility of partially resistant barley seedlings rests on a significant "early abortion" of colonies. This type of abortion occurs at about the moment of the formation of the first haustoria, when the young colonies have formed up to five or six haustorial mother cells. Early abortion is only incidentally associated with the collapse of host cells. Not only the variation in infectibility among barley genotypes but also the variation in infectivity among leaf rust isolates is based mainly on differences in the degree of early abortion. The occurrence of a high degree of early abortion in several unrelated barley genotypes indicates that the PR genes are part of a generally occurring system.

scholarly journals Non-hypersensitive leaf rust resistance of bread wheat cultivar PBW65 conditioned by genes different fromLr34

2009 ◽  
Vol 45 (No. 1) ◽  
pp. 26-30 ◽  
Author(s):  
M.A. Khan ◽  
R.G. Saini
Keyword(s):  
Leaf Rust ◽  
Bread Wheat ◽  
Rust Resistance ◽  
Wheat Cultivar ◽  
Infection Type ◽  
Puccinia Triticina ◽  
Leaf Rust Resistance ◽  
Triticum Aestivum L ◽  
Resistance Level ◽  
Highly Virulent

: The bread wheat (Triticum aestivum L.) cultivar PBW65 has shown hight levels of resistance to the most frequent and highly virulent Indian race 77-5 of leaf rust (Puccinia triticina). The infection type and disease severity indicated a non-hypersensitive type of resistance against the race 77-5 in PBW65. The cultivar PBW65 was crossed with the leaf rust susceptible cultivar WL711 to determine the mode of inheritance of the resistance. The segregation for resistant and susceptible plants in the F<sub>2</sub> and F<sub>3</sub> generations revealed, that two genes, each showing additive effects, were likely to confer resistance to leaf rust in PBW65. Intercrossing of PBW65 with Cook (Lr34), RL6058 (Lr34) and HD2009, possessing a similar resistance level like PBW65, revealed that the genes for leaf rust resistance in PBW65 were non-allelic to Cook (Lr34), RL6058 (Lr34) as well as to the gene(s) in HD2009. It is concluded that the cultivar PBW65 is a novel source of non-hypersensitive leaf rust resistance.

Tolerance of spring barley cultivars to leaf rust, Puccinia hordei

Euphytica ◽  
1980 ◽  
Vol 29 (2) ◽  
pp. 209-216 ◽  
Author(s):  
Th. Kramer ◽  
B. H. Gildemacher ◽  
M. Van der Ster ◽  
J. E. Parlevliet
Keyword(s):  
Leaf Rust ◽  
Spring Barley ◽  
Puccinia Hordei ◽  
Barley Cultivars

GENETICS OF LEAF RUST REACTION IN THREE INTRODUCTIONS OF COMMON WHEAT

1977 ◽  
Vol 19 (4) ◽  
pp. 711-716 ◽  
Author(s):  
P. L. Dyck
Keyword(s):  
Triticum Aestivum ◽  
Disease Resistance ◽  
Leaf Rust ◽  
Resistance Gene ◽  
Common Wheat ◽  
Infection Type ◽  
Triticum Aestivum L ◽  
Puccinia Recondita ◽  
Seedling Resistance

The genetics of seedling resistance to leaf rust (Puccinia recondita Rob. ex. Desm.) was investigated in what (Triticum aestivum L.) introductions PI 268454, PI 58548 and PI 268316, originally collected in Afghanistan, China and Iran, respectively. PI 268454 was heterogeneous for resistance. A selection (PI 268454a) has a gene that confers a 1+ reaction while a second selection (PI 268454b) probably has resistance gene Lr2b. PI 58548 has two genes for resistance, one giving a 1+ reaction and the second a 2+. These two genes interact to produce a; 1 reaction. PI 268316 has three interacting genes, one giving a 1+ reaction, the second a 2+ and a third resistance gene similar to LrB. The gene giving the 1+ reaction was common to all three introductions. PI 58548 and PI 268316 carry different genes for infection type 2+. Backcross lines of the single genes were produced. Implications to breeding for disease resistance of genes interacting to produce different phenotype are discussed.

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