Plant Science Colloquium with Prof. Zhaohui Liu
At the next Plant Science Colloquium Associate Professor Zhaohui Liu will give a presentation on the topic „A type III effector from Xanthomonas translucens triggers host resistance in the accessions of Aegilops tauschii and triticale“.
Time
Friday, 10.07.26 - 12:15 PM
Event format
Talk
Topic
Xanthomonas translucens pv. undulosa (Xtu) is the causal agent of wheat bacterial leaf streak (BLS), which has become an important disease in the Midwestern United States and elsewhere. We recently discovered that Xtu strains differ in their avirulence on the Aegilops tauschii accession TA10105. A diverse set of Xtu strains was phenotyped on this accession, and representative virulent and avirulent isolates were selected for wholegenome sequencing. Comparative genomic analysis identified a single type III effector gene present exclusively in avirulent isolates. Targeted disruption of this gene in an avirulent strain resulted in a susceptible reaction on TA10105, confirming its role in avirulence. To identify the corresponding resistance gene, an F₂ population derived from a cross between TA10105 and a susceptible A. tauschii line was developed and used for genetic mapping. The resistance locus was mapped to chromosome 5D. Notably, the same effector also confers avirulence on the triticale line Siskiyou, which is previously known to carry the resistance gene Xct1 on chromosome 5R. These findings suggest that the same or a highly similar resistance gene is present in both triticale and Ae. tauschii accessions. Cloning of the resistance gene(s) is currently underway. This work will advance our understanding of host–pathogen interactions in wheat BLS and facilitate the development of resistant wheat cultivars.
Speaker
Associate Professor Zhaohui Liu, Department of Plantathology North Dakota State University
Target groups
Students
Researchers
Location
Nussallee 9
Room
Hörsaal X
Reservation
not required
Additional Information
Organizer
Pfanzenwissenschaftliches Kolloquium
Contact