Colin Wellings

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Mapping genes for resistance to net form of net blotch and strip rust in barley (Hordeum vulgare L.)

A dihaploid mapping population comprising 65 lines was developed between barley parent varieties ... more A dihaploid mapping population comprising 65 lines was developed between barley parent varieties Tallon and Kaputar and used to construct a genetic linkage map. This map, comprising 195 amplified fragment length polymorphism and 38 simple sequence repeat markers, was used to identify markers linked to the net form of net blotch (Pyrenophora teres f.sp. teres) and to stripe rust (Puccinia striiformis f.sp. hordei) in barley. The population was screened with five pathotypes of net blotch at the seedling stage in the glasshouse and subjected to a natural inoculation in Hermitage, Queensland. Stripe rust screening was conducted at the adult plant stage in Toluca, Mexico. Analyses of the markers were performed using Mapmanager and Qgene software. One region on chromosome 6H was highly significantly associated with resistance to the net blotch (R2 = 79%). This association was consistent for all pathotypes studied. One region on chromosome 5H was found to be highly significantly associated...

The Genes for Resistance to Stem Rust in Wheat and Triticale

Wheat Rusts, 1995

The Genes for Resistance to Leaf Rust in Wheat and Triticale

Wheat Rusts, 1995

An accelerated method for evaluating adult-plant resistance to leaf and stripe rust in spring wheat

Acta Phytopathologica Et Entomologica Hungarica, 2000

Meeting the challenge of yellow rust in cereal crops

Meeting the challenge of yellow rust in cereal crops: proceedings of the regional conference on Y... more Meeting the challenge of yellow rust in cereal crops: proceedings of the regional conference on Yellow Rust in the central and West Asia and North Africa region, 8-14 May 2001, Karaj, Iran , Meeting the challenge of yellow rust in cereal crops: proceedings of the regional conference on Yell... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Breeding winter wheat for yellow rust resistance in Tajikistan

Future approaches in biotechnology to wheat rust breeding at ICARDA

Improvement of wheat yellow rust resistance in Kazakhstan and Uzbekistan through sub-regional co-operation

The importance of yellow rust in rainfed-wheat areas of Central and West Asia and North Africa (CWANA)

Collaborative barley stripe rust resistance gene mapping and deployment efforts

Complementary resistance genes in wheat selection 'Avocet R' confer resistance to stripe rust

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, Jan 3, 2015

Complementary genes for resistance to wheat stripe rust in an Avocet selection mapped to chromoso... more Complementary genes for resistance to wheat stripe rust in an Avocet selection mapped to chromosome arms 3DL and 5BL. Susceptible Avocet selections lacked the 5BL gene due to a chromosomal deletion. This study reports the inheritance and genetic mapping of the YrA (temporary name of convenience to describe the specificity) seedling resistance to wheat stripe rust (caused by Puccinia striiformis f. sp. tritici; Pst) in a resistant selection of the Australian cv. Avocet [Avocet R (AvR)-AUS 90660]. Genetic analysis was performed on F2 populations and F3 generation families from crosses between wheats that carried and lacked the YrA resistance. Greenhouse seedling tests with two avirulent Pst pathotypes (104 E137 A- and 108 E141 A-) confirmed that the YrA resistance was inherited as two complementary dominant genes. Ninety-two doubled haploid (DH) lines from a cross between the Australian cv. Teal (Pst susceptible) and AvR were used for DArT-Seq genotypic analysis to map the seedling re...

Puccinia striiformis f.sp. tritici in Eastern Australia possible means of entry and implications for plant quarantine

Plant Pathology, 1987

Molecular genetic variability of Australian isolates of five cereal rust pathogens

Mycological Research, 2003

Rust fungi cause economically important diseases of cereals, and their ability to rapidly evolve ... more Rust fungi cause economically important diseases of cereals, and their ability to rapidly evolve new virulent races has hindered attempts to control them by genetic resistance. PCR-based molecular tools may assist in understanding the genetic structure of pathogen populations. The high multiplex DNA fingerprinting techniques, amplified fragment length polymorphisms (AFLP), selectively amplified microsatellites (SAM) and sequence-specific amplification polymorphisms (S-SAP) were assessed for their potential in investigations of the genetic relationships among isolates of the wheat rust pathogens, Puccinia graminis f. sp. tritici (Pgt), Puccinia triticina (Pt), and P. striiformis f. sp. tritici (Pst), the oat stem rust pathogen P. graminis f. sp. avenae (Pga), and a putative new P. striiformis special form tentatively designated Barley grass yellow rust (Bgyr). Marker information content, as indicated by the number of species-specific fragments, polymorphic fragments among pathotypes, percentage of polymorphic loci, and the marker index, was highest for the SAM assay, followed by the AFLP and S-SAP assays. UPGMA analysis revealed that all marker types efficiently discriminated the five different taxa and Mantel tests revealed significant correlations between the marker types. Within pathogen groups, the marker types differed in the amount of variation detected among isolates; however, the major differences were consistent and polymorphism was generally low. This was reflected by the AMOVA analysis that significantly partitioned 90 % of the genetic variation between taxa. Of the three marker types, SAMS were the most informative, and have the potential for the development of locus-specific microsatellites.

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Seedling resistances to rust diseases in international triticale germplasm

Crop and Pasture Science, 2010

Seedling resistances to stem rust, leaf rust and stripe rust were evaluated in the 37th Internati... more Seedling resistances to stem rust, leaf rust and stripe rust were evaluated in the 37th International Triticale Screening Nursery, distributed by the International Wheat and Maize Improvement Centre (CIMMYT) in 2005. In stem rust tests, 12 and 69 of a total of 81 entries were postulated to carry Sr27 and SrSatu, respectively. When compared with previous studies of CIMMYT triticale nurseries distributed from 1980 to 1986 and 1991 to 1993, the results suggest a lack of expansion in the diversity of stem rust resistance. A total of 62 of 64 entries were resistant to five leaf rust pathotypes. In stripe rust tests, ~93% of the lines were postulated to carry Yr9 alone or in combination with other genes. The absence of Lr26 in these entries indicated that Yr9 and Lr26 are not genetically associated in triticale. A high proportion of nursery entries (63%) were postulated to carry an uncharacterised gene, YrJackie. The 13 lines resistant to stripe rust and the 62 entries resistant to leaf r...

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Detection and occurrence of a new pathotype of Puccinia triticina with virulence for Lr24 in Australia

Australian Journal of Agricultural Research, 2002

The leaf rust resistance gene Lr24 remained effective in Australia from at least 1983, when the f... more The leaf rust resistance gene Lr24 remained effective in Australia from at least 1983, when the first wheat cultivar with this gene was released, until 2000, when a virulent isolate of Puccinia triticina was detected. Results of comparative greenhouse studies were consistent with the hypothesis that the new virulent isolate developed from pathotype 104-1,2,3,(6),(7),11 by mutation to virulence for Lr24. The new pathotype was first detected in South Australia (October 2000), and was subsequently detected in southern New South Wales (November 2000), Victoria (March 2001), and Queensland (March 2001), suggesting that it originated in South Australia and then spread to other parts of the eastern Australian wheatbelt. Greenhouse tests of 28 Australian wheat cultivars possessing Lr24 revealed that all except Dennis, Giles, Petrie, and Sunsoft 98 were seedling susceptible to the new pathotype. Cultivars Giles, Petrie, and Sunsoft 98 were postulated to carry Lr13, whereas cv. Dennis carries...

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Wheat Rusts: An Atlas of Resistance Genes

Australasian Plant Pathology, 1996

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The development and application of near-isogenic lines for monitoring cereal rust pathogens

The purpose of monitoring cereal rust pathogens is to provide a basis for disease control strateg... more The purpose of monitoring cereal rust pathogens is to provide a basis for disease control strategies that include breeding for resistance, predicting disease response in commercial cultivars and responding to the dynamics of pathogen change. The means of achieving this vary from regular collection surveys based on assessments of sample collections in greenhouse tests, to monitoring and recording static trap plots. Factors governing the method of approach include the size of the target region, the available research resources and the experience of staff involved. This paper is a brief review of the development of near-isogenic lines as a means of monitoring cereal rust pathogens. Emphasis will be given to wheat stripe/ yellow rust and the development and application of a near-isogenic set of materials based on the spring wheat cultivar Avocet. This parent was selected because of its high degree of susceptibility to the disease, agronomic adaptability (semidwarf, spring habit, moderat...

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Genetic analysis of seedling stripe rust resistance in the Australian wheat cultivar 'Batavia

Batavia, an Australian wheat cultivars has high level of seedling and adult-plant resistance to s... more Batavia, an Australian wheat cultivars has high level of seedling and adult-plant resistance to stripe rust in Australia. Batavia x Avocet S cross was used to study the seedling resistance of Batavia. Parental cultivars, F1 hybrids and genetic populations were scored for seedling resistance to pathotypes 110 E143 A and 134 E16 A. The frequencies of seedling infection types of three F2 populations and a F3 population were a good fit to the expected segregation ratio for two genes. Chi-square values of individual F3 lines segregating for 12 and 23 c displayed a good fit for single gene segregation. The data provide support for the hypothesis that two genes confer the seedling resistance in Batavia and putative stripe rust resistance genes were designated as YrBat1 and YrBat2 conferring seedling infection types of 12 and 23, respectively. Interaction of these genes that were of intermediate IT shown in F1, produced a lower IT similar to the parent Batavia (IT;1) when combined in homozy...

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Chemical suppression of barley yellow rust

Molecular mapping as a tool for pre-emptive breeding for resistance to the exotic barley pathogen, Puccinia striiformis f. sp. hordei

Australian Journal of Agricultural Research, 2003

Barley stripe rust (BSR), caused by Puccinia striiformis f. sp. hordei, has been a major disease ... more Barley stripe rust (BSR), caused by Puccinia striiformis f. sp. hordei, has been a major disease problem to the barley industry worldwide that has not, to date, been detected in Australia. This paper describes the mapping of stripe rust resistance genes in Tallon/Kaputar (TK) and Arapiles/Franklin (AF) populations. The paper also reports on the usefulness of markers associated with alternative sources of resistance previously identified in the varieties Orca and Shyri in the USA. Stripe rust screening was conducted at the adult plant stage in Toluca, Mexico, for 2 years. Two major quantitative trait loci (QTLs) were found on chromosomes 2H and 5H in both populations. One region on chromosome 5H was highly significantly associated with resistance to stripe rust (R2 = 68% and 34% in TK and AF, respectively). The QTL on chromosome 2H accounted for 36% of the variation in TK and 10% of the variation in the AF population. These associations were consistent over both years. Further work w...

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