Oat Stem Rust

Martens, J. W.

doi:10.1016/b978-0-12-148402-6.50012-2

Cited by 23 publications

(9 citation statements)

References 44 publications

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“…Earlier literature on pathogenicity genetics of cereal rust fungi is reviewed by several researchers (81,82,116). Although avirulence can be either dominant or recessive, most avirulence genes in Pgt, Pga, Pt, and Pc are dominant and controlled by single loci (52,91,94,120,121,147).…”

Section: Inheritance Of Avirulence/virulencementioning

confidence: 99%

Role of Alternate Hosts in Epidemiology and Pathogen Variation of Cereal Rusts

Zhao

Wang

Chen

et al. 2016

Annu. Rev. Phytopathol.

128

104

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Cereal rusts, caused by obligate and biotrophic fungi in the genus Puccinia, are important diseases that threaten world food security. With the recent discovery of alternate hosts for the stripe rust fungus (Puccinia striiformis), all cereal rust fungi are now known to be heteroecious, requiring two distinct plant species serving as primary or alternate hosts to complete their sexual life cycle. The roles of the alternate hosts in disease epidemiology and pathogen variation vary greatly from species to species and from region to region because of different climatic and cropping conditions. We focus this review on rust fungi of small grains, mainly stripe rust, stem rust, leaf rust, and crown rust of wheat, barley, oat, rye, and triticale, with emphases on the contributions of alternate hosts to the development and management of rust diseases.

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Section: Inheritance Of Avirulence/virulencementioning

confidence: 99%

Role of Alternate Hosts in Epidemiology and Pathogen Variation of Cereal Rusts

Zhao

Wang

Chen

et al. 2016

Annu. Rev. Phytopathol.

128

104

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“…Gene Pg9 does provide back-up resistance to gene Pg13, which is the only gene in current cultivars providing a high level of resistance. Given the paucity of genes for resistance to the oat stem rust pathogen (Martens 1985), it is important to retain both Pg9 and Pg13 in the breeding lines. There are, however, no available stem rust races that will detect the presence of Pg9 in the presence of Pg13.…”

Section: Mckenzie Et Al (1965) Previously Had Indicated That Genementioning

confidence: 99%

Identification of the stem rust resistance gene Pg9 and its association with crown rust resistance and endosperm proteins in 'Dumont' oat

Chong¹,

Howes²,

Brown³

et al. 1994

Genome

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The Canadian oat cultivar 'Dumont' is known to have genes Pc38 and Pc39 for crown rust resistance and genes Pg2 and Pg13 for stem rust resistance. When crossed to a susceptible oat line OT328, 'Dumont' was shown to have an additional dominant gene for crown rust resistance, designated PcX. Tests of segregating progeny indicated that the stem rust resistance gene Pg9 is present and is tightly linked in coupling to PcX. The presence of Pg9 in 'Dumont' was confirmed in crosses involving the cultivar 'Ukraine', which has Pg9 and a crown rust resistance gene tightly linked to it. The association of rust resistance with endosperm proteins in 'Dumont' was investigated. The linkage of gene Pg13 with a 56.6-kDa polypeptide locus (map distance of 10.47 +/- 2.70 cM) was demonstrated using sodium dodecylsulfate - polyacrylamide gel electrophoresis (SDS-PAGE). A 27.9-kDa polypeptide was shown to be associated with the linked PcX/Pg9 loci by SDS-PAGE but appeared to be more reliably separated as an avenin band, designated B4, using acid-PAGE. Another avenin band, designated B2, also was shown to be associated with the PcX/Pg9 loci using acid-PAGE. The loci conditioning the B2 and B4 bands appeared to be tightly linked or allelic and are separated from the linked PcX/Pg9 loci by a map distance of 1.03 +/- 0.36 cM. The association of Pg13 with a 56.6-kDa polypeptide and the tight linkage between PcX/Pg9 and the B2 (in coupling) and B4 (in repulsion) avenin loci offer a useful tool to breeders to detect the presence of these genes in oat breeding.

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“…and Henning (Pga) is an economically important foliar disease of oat. Urediniospores of Pga rapidly proliferate on susceptible oat cultivars and can cause severe yield and quality losses under favorable environmental conditions (Roelfs and Long 1980;Martens 1985). Van Niekerk et al (2001) demonstrated that after an experimental stem rust epidemic, oat grain yield and test weight were reduced by 85% and 45%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Comparative sequencing and SNP marker validation for oat stem rust resistance gene Pg6 in a diverse collection of Avena accessions

Gordon¹,

Jin

Tinker

et al. 2022

Theor Appl Genet

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Key message Comparative sequence analysis was used to design a SNP marker that aided in the identification of new sources of oat stem rust resistance. Abstract New races of Puccinia graminis f. sp. avenae (Pga) threaten global oat production. An A. strigosa accession known to carry the broadly effective oat stem rust resistance gene, Pg6, was crossed with two susceptible A. strigosa accessions to generate 198 F2:3 families and 190 F5:6 RILs. The RIL population was used to determine that Pg6 was a single dominant gene located between 475 and 491 Mbp on diploid chromosome AA2 of the A. atlantica genome. This region was further refined by identifying SNPs associated with Pg6 resistance in a panel of previously sequenced A-genome accessions. Twenty-four markers were developed from SNPs that showed perfect association between the Pg6 phenotype and 11 sequenced Avena diploid accessions. These markers were validated in the RILs and F2:3 families, and the markers most closely linked with resistance were tested in a diverse panel of 253 accessions consisting of oat stem rust differentials, all available diploid Avena spp. accessions, and 41 A. vaviloviana accessions from the National Small Grains Collection. One SNP marker located at 483, 439, 497 bp on AA2, designated as AA2_483439497, was perfectly associated with the Pg6 phenotype in Avena strigosa diploids and was within several Kb of a resistance gene analog, RPP13. The marker results and seedling testing against Pga races DBD, KBD, TJS, and TQL enabled the postulation of Pg6 and potential new sources of resistance in the Avena panel. These results will be used to infer Pg6 presence in other germplasm collections and breeding programs and can assist with introgression, gene pyramiding, and cloning of Pg6.

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Oat Stem Rust

Cited by 23 publications

References 44 publications

Role of Alternate Hosts in Epidemiology and Pathogen Variation of Cereal Rusts

Role of Alternate Hosts in Epidemiology and Pathogen Variation of Cereal Rusts

Identification of the stem rust resistance gene Pg9 and its association with crown rust resistance and endosperm proteins in 'Dumont' oat

Comparative sequencing and SNP marker validation for oat stem rust resistance gene Pg6 in a diverse collection of Avena accessions

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