Elucidating the genetic control of bacterial wilt resistance in Italian ryegrass
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2025-04-11
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Other Conference Item
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yes
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Abstract
Xanthomonas translucens pv. graminis (Xtg) causes bacterial wilt, one of the most important forage grass diseases in temperate grasslands. Molecular genetic and genomic tools have the potential to significantly benefit resistance breeding and to enable targeted resistance management. In the past, a major QTL for bacterial wilt resistance was identified in Lolium multiflorum and Xtg was shown to rely on a non-canonical type III secretion system for plant infection. A number of candidate genes for bacterial wilt resistance were identified using a bulked segregant analysis approach. Whole genome sequencing of susceptible and resistant pools of a large biparental F2 population revealed a ~330kb region associated to bacterial wilt resistance. Comparative genomics of different X. translucens pathovars allowed to identify virulence traits characteristic for Xtg. A high number of transposases were exclusively found in Xtg 25 and corresponded to 413 to 457 insertion/excision transposable elements per strain. These mobile 26 genetic elements are likely to be involved in the observed genomic plasticity and may play an important role in the adaptation of Xtg. The candidate plant resistance genes together with the bacterial virulence factors identified provide an invaluable resource for the development of genomics assisted selection strategies. In addition, the well characterised plant genotypes and bacterial strains serve as an ideal model system to fully understand the complex L. multiflorum - Xtg interaction.
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2025 Bacterial Leaf Streak Meeting Abstracts
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University of Minnesote, Department of Plant Pathology
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4th Annual Bacterial Leaf Streak Initiative Conference
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03969 - Studer, Bruno / Studer, Bruno
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Conference lecture held on April 11, 2025.
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Is part of: https://www.blsresearch.org/meetings/2025