PhD ceremony: Ms. P. Stevens, 13.15 uur, Academiegebouw, Broerstraat 5, Groningen
Thesis: Adaptation of Ralstonia solanacearum biovar 2 to temperate climates
Promotor(s): prof. J.D. van Elsas
Faculty: Mathematics and Natural Sciences
Ralstonia solanacearum biovar 2, the causative agent of potato brown rot, probably originates from the cradle of potato, the Andes and from there has incidentally spread to different regions of the world. In the Netherlands, bacterial wilt has been reported as from the mid-1990-ies. The organism can still be found in local waterways. Patricia Stevens hypothesized that the organism, which is of tropical and warm temperate origin, may have experienced conditions that are strongly selective for particular genotypic and/or phenotypic adaptations.
To investigate whether the Dutch R. solanacearum population has diversified, strains were isolated by Stevens from water, bittersweet plants and sediment from a high risk area. These newly obtained strains (n=42) were genetically and phenotypically analyzed and compared to two strains isolated from potato, i.e one Dutch and one tropical strain. Overall, the strains showed a clonal structure using a range of molecular methods. However, heterogeneity across strains was seen that appeared mostly related to recombination processes. Stevens identified a 17.6 Kb putative genomic island (PGI-1), which was deleted from the genome of environmental strain KZR-5. Although the exact set of functions harbored by PGI-1 is as yet unknown, the island encompasses two genes of potential ecological relevance, i.e. one encoding a hypothetical protein with a RelA/SpoT domain and a putative cellobiohydrolase. Stevens thus assessed the behavior of several strains under different environmental conditions. Her results indicate that environmental strain KZR-5 has incurred altered fitness, with divergent outcomes, i.e. enhanced tolerance to cold stress versus reduced competitiveness during growth and in plant invasion.
The timing, route, and destination for godwit migration is learned rather than innate. Researchers at the University of Groningen discovered this in a daring experiment, which has been published in the latest issue of the journal Current Biology.
The grant is worth EUR 500,000, of which Avraamidou and Sburlea receive around EUR 100,000.
George Azzopardi and Guru Swaroop Bennabhaktula from the Faculty of Science and Engineering have won the Ben Feringa Impact Award 2023 for their project ‘4NSEEK; Forensic Against Sexual Exploitation of Children’. In the ‘students’ category, Nine van...
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