This is the first report on genetic analysis and genome mapping of major dominant genes for near non-host resistance to barley crown rust ( Puccinia coronata var. hordei ) in common wheat. Barley crown rust, caused by Puccinia coronata var. hordei, primarily occurs on barley (Hordeum vulgare L.) in the Great Plain regions of the United States. However, a few genotypes of common wheat (Triticum aestivum L.) were susceptible to this pathogen among 750 wheat accessions evaluated. To investigate the genetics of crown rust resistance in wheat, a susceptible winter wheat accession PI 350005 was used in crosses with two resistant wheat varieties, Chinese Spring and Chris. Analysis of F1 plants and F2 populations from these two crosses indicated that crown rust resistance is controlled by one and two dominant genes in Chris and Chinese Spring, respectively. To determine the chromosome location of the resistance gene Cr1 in Chris, a set of 21 monosomic lines derived from Chris was used as female parents to cross with a susceptible spring type selection (SSTS35) derived from the PI 350005/Chris cross. Monosomic analysis indicated that Cr1 is located on chromosome 5D in Chris and one of the crown rust resistance genes is located on chromosome 2D in Chinese Spring. The other gene in Chinese Spring is not on 5D and thus is different from Cr1. Molecular linkage analysis and QTL mapping using a population of 136 doubled haploid lines derived from Chris/PI 350005 further positioned Cr1 between SSR markers Xwmc41-2 and Xgdm63 located on the long arm of chromosome 5D. Our study suggests that near non-host resistance to crown rust in these different common wheat genotypes is simply inherited.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s00122-013-2245-z | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Characterisation of virulence of f. sp. in Australia in the 2023 growing season.
Plant Dis
January 2025
CSIRO, Agriculture and Food, Canberra, Australian Capital Territory, Australia;
Crown rust caused by the basidiomycete fungus f. sp. () results in significant crop losses worldwide.
View Article and Find Full Text PDFA high-resolution haplotype collection uncovers somatic hybridization, recombination and intercontinental movement in oat crown rust.
PLoS Genet
November 2024
Commonwealth Scientific and Industrial Research Organisation, Australian Capital Territory, Australia.
Article Synopsis
- The population structure and evolution of basidiomycetes, such as rust fungi, are shaped by complex reproductive strategies that include both asexual and sexual reproduction, which enhance their adaptability.
- Puccinia coronata f. sp. avenae (Pca), a significant oat pathogen, exhibits varied contributions from sexual reproduction, clonality, and genetic exchange to its evolution, leading to challenges in managing host resistance.
- Recent genome sequencing of Pca isolates from the USA, Australia, Taiwan, and South Africa revealed genetic recombination and somatic hybridization, indicating increased genetic diversity and potential intercontinental movement of strains, highlighting the need for global pathogen monitoring.
Stacking beneficial haplotypes from the Vavilov wheat collection to accelerate breeding for multiple disease resistance.
Theor Appl Genet
November 2024
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, Australia.
We revealed the neglected genetic relationships of resistance for six major wheat diseases and established a haploblock-based catalogue with novel forms of resistance by multi-trait haplotype characterisation. Genetic potential to improve multiple disease resistance was highlighted through haplotype stacking simulations. Wheat production is threatened by numerous fungal diseases, but the potential to breed for multiple disease resistance (MDR) mechanisms is yet to be explored.
View Article and Find Full Text PDFConfirmation of oat crown rust disease in Taiwan.
Plant Dis
October 2024
National Taiwan University, Department of Agronomy, Taipei, Taiwan;
Article Synopsis
- Oats are a minor forage crop in Taiwan, and previous records of oat rust disease in the country are limited, leading to a lack of understanding of the pathogen population.
- In 2019, a rust-like outbreak at National Taiwan University's Experimental Farm prompted researchers to collect samples and identify the responsible pathogen, suspected to be the oat crown rust fungus.
- The study successfully confirmed the pathogen's identity using phenotypic and molecular techniques, establishing it as the first molecular confirmation of this pathogen in Taiwan and noting its low virulence traits.
Genome-wide analysis of salicylic acid and jasmonic acid signalling marker gene families in wheat.
Plant Biol (Stuttg)
August 2024
UCD School of Biology and Environmental Science and Earth Institute, College of Science, University College Dublin, Dublin, Ireland.
Article Synopsis
- Jasmonic acid (JA) and salicylic acid (SA) are important phytohormones that help wheat plants manage stress, but research on the wheat genes linked to these hormones is limited.
- This study analyzed genomic and transcriptomic data from wheat, along with other plants, to identify the diversity and responsiveness of seven hormone-responsive gene families, ultimately selecting 14 candidate genes as potential markers.
- Key findings revealed that wheat has a significantly larger number of genes in these families compared to other species, and distinct responses to JA and SA treatments, with potential implications for monitoring stress responses in wheat.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!