Genetics of Resistance to Wheat Leaf Rust, Stem Rust, and Powdery Mildew in <i>Aegilops sharonensis</i>

Olivera, Pablo D.; Millet, E.; Anikster, Y.; Steffenson, Brian J.

doi:10.1094/phyto-98-3-0353

Cited by 18 publications

(12 citation statements)

References 26 publications

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“…A substantial contribution to reducing losses could be obtained if multiple independent R genes were cloned, shown to recognize distinct and relatively immutable and indispensable pathogen effectors, and transformed in a stack into an elite variety. Several groups around the world are now collaborating to achieve this goal, starting with resistance genes to Ug99 defined in wild relatives of wheat from the Sitopsis section of the Aegilops genus, such as Aegilops sharonensis [24,25] (). As genomics methods continue to be refined, and as knowledge of the genomes of crops and their relatives continues to expand, resistance gene isolation will get easier.…”

Section: Discussionmentioning

confidence: 99%

Elevating crop disease resistance with cloned genes

Jones

Witek

Verweij

et al. 2014

Phil. Trans. R. Soc. B

112

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Essentially all plant species exhibit heritable genetic variation for resistance to a variety of plant diseases caused by fungi, bacteria, oomycetes or viruses. Disease losses in crop monocultures are already significant, and would be greater but for applications of disease-controlling agrichemicals. For sustainable intensification of crop production, we argue that disease control should as far as possible be achieved using genetics rather than using costly recurrent chemical sprays. The latter imply CO2 emissions from diesel fuel and potential soil compaction from tractor journeys. Great progress has been made in the past 25 years in our understanding of the molecular basis of plant disease resistance mechanisms, and of how pathogens circumvent them. These insights can inform more sophisticated approaches to elevating disease resistance in crops that help us tip the evolutionary balance in favour of the crop and away from the pathogen. We illustrate this theme with an account of a genetically modified (GM) blight-resistant potato trial in Norwich, using the Rpi-vnt1.1 gene isolated from a wild relative of potato, Solanum venturii, and introduced by GM methods into the potato variety Desiree.

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Section: Discussionmentioning

confidence: 99%

Elevating crop disease resistance with cloned genes

Jones

Witek

Verweij

et al. 2014

Phil. Trans. R. Soc. B

112

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“…In an inheritance study of several Ae. sharonensis accessions to leaf rust, stem rust, and powdery mildew, Olivera et al (2008) detected dominant resistance alleles at genes with major effects. In individual accessions from different geographic regions, the authors found different genes that were effective against all of the P. triticina races evaluated.…”

Section: Resistance To Biotic Stressmentioning

confidence: 95%

Aegilops sharonensis:Origin, genetics, diversity, and potential for wheat improvement

Olivera

Steffenson

2009

Botany

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Aegilops sharonensis Eig (Sharon goatgrass; section Sitopsis) is an annual diploid grass species growing endemically in the coastal plains of Israel and southern Lebanon. It is a wild relative of wheat, with a genome closely related to the B genome of cultivated bread wheat. With the most limited distribution of any species in the genus Aegilops, Ae. sharonensis is rapidly losing its habitats, owing to the combined effects of modern agricultural intensification and expansion of urban and industrial areas. Aegilops sharonensis is known to be a rich source of genes providing resistance to important wheat diseases and abiotic stresses, but it has not been widely exploited. The presence of gametocidal genes that control preferential transmission of chromosome 4Ssh increases the difficulty of introgressing genes from Ae. sharonensis into wheat. However, successful introgression of the genes for resistance to leaf rust, stripe rust, and powdery mildew has been achieved. Studies on genetic and phenotypic diversity indicated that Ae. sharonensis is a highly diverse species, comparable with others that have a wider geographic distribution and more variable environments. Targeting the regions and sites with the highest diversity in Ae. sharonensis will facilitate the capture of the greatest variability and also the identification of novel and diverse genes for wheat improvement.

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“…sharonensis is great, as Olivera et al (2007) recently identified many accessions with resistance to the important wheat diseases of leaf rust, stem rust, stripe rust, powdery mildew, spot blotch, and tan spot. In another recent study, Olivera et al (2008) determined the genetic basis of resistance to wheat leaf rust, stem rust, and powdery mildew in Ae. sharonensis.…”

Section: Introductionmentioning

confidence: 99%

Development of a genetic linkage map for Sharon goatgrass (Aegilops sharonensis) and mapping of a leaf rust resistance gene

Olivera

Kilian²,

Wenzl³

et al. 2013

Genome

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Aegilops sharonensis (Sharon goatgrass), a diploid wheat relative, is known to be a rich source of disease resistance genes for wheat improvement. To facilitate the transfer of these genes into wheat, information on their chromosomal location is important. A genetic linkage map of Ae. sharonensis was constructed based on 179 F2 plants derived from a cross between accessions resistant (1644) and susceptible (1193) to wheat leaf rust. The linkage map was based on 389 markers (377 Diversity Arrays Technology (DArT) and 12 simple sequence repeat (SSR) loci) and was comprised of 10 linkage groups, ranging from 2.3 to 124.6 cM. The total genetic length of the map was 818.0 cM, with an average interval distance between markers of 3.63 cM. Based on the chromosomal location of 115 markers previously mapped in wheat, the four linkage groups of A, B, C, and E were assigned to Ae. sharonensis (S(sh)) and homoeologous wheat chromosomes 6, 1, 3, and 2. The single dominant gene (designated LrAeSh1644) conferring resistance to leaf rust race THBJ in accession 1644 was positioned on linkage group A (chromosome 6S(sh)) and was flanked by DArT markers wpt-9881 (at 1.9 cM distal from the gene) and wpt-6925 (4.5 cM proximal). This study clearly demonstrates the utility of DArT for genotyping uncharacterized species and tagging resistance genes where pertinent genomic information is lacking.

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Genetics of Resistance to Wheat Leaf Rust, Stem Rust, and Powdery Mildew in Aegilops sharonensis

Cited by 18 publications

References 26 publications

Elevating crop disease resistance with cloned genes

Elevating crop disease resistance with cloned genes

Aegilops sharonensis:Origin, genetics, diversity, and potential for wheat improvement

Development of a genetic linkage map for Sharon goatgrass (Aegilops sharonensis) and mapping of a leaf rust resistance gene

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