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Featured researches published by Beat Keller.


International Journal of Molecular Sciences | 2010

Relationships among the A Genomes of Triticum L. species as evidenced by SSR markers, in Iran.

Mohammad Hosein Ehtemam; Mohammad Reza Rahiminejad; Hojjatollah Saeidi; Badraldin Ebrahim Sayed Tabatabaei; Simon G. Krattinger; Beat Keller

The relationships among 55 wheat accessions (47 accessions collected from Iran and eight accessions provided by the Institute of Plant Biology of the University of Zurich, Switzerland) belonging to eight species carrying A genome (Triticum monococcum L., T. boeoticum Boiss., T. urartu Tumanian ex Gandilyan, T. durum Desf., T. turgidum L., T. dicoccum Schrank ex Schübler, T. dicoccoides (Körn. ex Asch. & Graebner) Schweinf. and T. aestivum L.) were evaluated using 31 A genome specific microsatellite markers. A high level of polymorphism was observed among the accessions studied (PIC = 0.77). The highest gene diversity was revealed among T. durum genotypes, while the lowest genetic variation was found in T. dicoccoides accessions. The analysis of molecular variance (AMOVA) showed a significant genetic variance (75.56%) among these accessions, representing a high intra-specific genetic diversity within Triticum taxa in Iran. However, such a variance was not observed among their ploidy levels. Based on the genetic similarity analysis, the accessions collected from Iran were divided into two main groups: diploids and polyploids. The genetic similarity among the diploid and polyploid species was 0.85 and 0.89 respectively. There were no significant differences in A genome diversity from different geographic regions. Based on the genetic diversity analyses, we consider there is value in a greater sampling of each species in Iran to discover useful genes for breeding purposes.


Plant Pathology | 2018

Transcriptional profiling reveals no response of fungal pathogens to the durable, quantitative Lr34 disease resistance gene of wheat

Justine Sucher; F. Menardo; C. R. Praz; Rainer Boni; Simon G. Krattinger; Beat Keller

Durable resistance against fungal pathogens is highly valuable for disease management in agriculture. For its sustainable use, and to avoid pathogen adaptation, it is important to understand the underlying molecular mechanisms. Many studies on durable disease resistance in plants have focused exclusively on the host plant, whereas possible reactions and adaptations of pathogens exposed to this type of resistance have not been well researched. The wheat Lr34 gene, encoding a putative ABC-transporter, provides broad-spectrum and durable resistance against multiple fungal pathogens in wheat and is functional as a transgene in all major cereals. Lr34-based resistance is partial, meaning pathogens can grow and reproduce to some degree on Lr34-containing plants. Therefore, Lr34-expressing plants are ideal for studying the response of pathogens to partial resistance. Here, transcriptomic responses of the two fungal pathogens Blumeria graminis f. sp. hordei (barley powdery mildew) and Puccinia triticina (wheat leaf rust) during growth on their respective host plants containing Lr34 were compared to their responses on control plants without Lr34. Two different time points after inoculation were chosen for analysis of powdery mildew on barley and one time point for wheat leaf rust. Transcriptome analyses revealed that there were no differences in the expression patterns of the two pathogens growing on susceptible versus partially resistant plants, even though pathogen growth was reduced in the presence of Lr34. This reflects the absence of observable reaction in the pathogen to the presence of the Lr34 resistance gene and, consequently, no major alteration of fungal pathogen metabolism.


Archive | 2016

The functional transfer of the wheat gene Lr34 into rice and its resistance against rice blast. [P0395]

Justine Sucher; Simon G. Krattinger; Liselotte L. Selter; Harsh Chauhan; Bo Zhou; Mingzhi Tang; Narayana M. Upadhyaya; Delphine Mieulet; Emmanuel Guiderdoni; Denise Weidenbach; Ulrich Schaffrath; Evans Lagudah; Beat Keller


Archive | 2015

tpj13001-sup-0002-TableS1

Harsh Chauhan; Rainer Boni; Rahel Bucher; Benjamin M. Kuhn; Gabriele Buchmann; Justine Sucher; Liselotte L. Selter; Goetz Hensel; Jochen Kumlehn; Laurent Bigler; Gaétan Glauser; Thomas Wicker; Simon G. Krattinger; Beat Keller


Archive | 2015

tpj13001-sup-0001-FigS1-S12

Harsh Chauhan; Rainer Boni; Rahel Bucher; Benjamin M. Kuhn; Gabriele Buchmann; Justine Sucher; Liselotte L. Selter; Goetz Hensel; Jochen Kumlehn; Laurent Bigler; Gaétan Glauser; Thomas Wicker; Simon G. Krattinger; Beat Keller


Archive | 2015

tpj13001-sup-0008-Legends

Harsh Chauhan; Rainer Boni; Rahel Bucher; Benjamin M. Kuhn; Gabriele Buchmann; Justine Sucher; Liselotte L. Selter; Goetz Hensel; Jochen Kumlehn; Laurent Bigler; Gaétan Glauser; Thomas Wicker; Simon G. Krattinger; Beat Keller


Archive | 2014

CS-21.5 THE WHEAT RESISTANCE GENE Lr34 PROVIDES MULTI-PATHOGEN RESISTANCE IN BARLEY

Rainer Böni; Simon G. Krattinger; Harsh Chauhan; Liselotte L. Selter; Evans S. Lagudah; Beat Keller


Archive | 2014

Helminthosporium turcicum-resistant plant

Milena Ouzunova; Daniela Scheuermann; Beat Keller; Simon G. Krattinger; Thomas Wicker; Gerhard Herren; Severine Hurni; Bettina Kessel; Thomas Presterl; Carsten Knaak


Indian phytopathology | 2012

Mapping of Indian bread wheat population, HD 2189 × Agra Local for adult plant leaf rust resistance, Lr34

M.S. Saharan; R. Tiwari; Simon G. Krattinger; Beat Keller; Priyamvada


Archive | 2009

Transgenic plant cells with enhanced resistance to fungal pathogens

Evans Lagudah; Wolfgang Spielmeyer; Beat Keller; Simon G. Krattinger

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