"Postdoctoral Researcher in Molecular Virology, Microbiology and Metagenomics/Metaviromics"

Discovering the benefits of plant growth-promoting bacteriophages

Microbial Ecology and Evolution Research group led by Professor Ville-Petri Friman at the Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki.

About the position:

Plant growth is not only determined by the plant genotype but also by the presence of beneficial microbes that can boost plant growth by providing access to nutrients, defending plants against invading pathogens, and producing plant growth-promoting hormones. While increasing evidence suggests that phages can shape the composition, diversity and functioning of rhizosphere bacterial communities, we lack an understanding of how these changes are associated with plant health and growth. The main aim of this project is to experimentally study how phages can boost plant growth and to determine the underlying genetic and molecular mechanisms of phage-mediated plant growth-promotion.

Even though phages do not directly interact with plants, they can indirectly affect plant growth by interacting with plant-associated rhizosphere bacteria. For example, lytic phages can infect and kill plant-pathogenic bacterial taxa and reduce their relative abundances alleviating plant disease symptoms. Selective killing of bacterial taxa can also lead to the enrichment of plant growth-promoting bacteria in the rhizosphere, which could result in improved plant growth. Moreover, by killing bacteria, lytic phages release nutrients in the rhizosphere, which could help plants sequester and assimilate resources to support their growth. Finally, temperate phages can integrate into bacterial chromosomes and provision bacteria with additional genes (auxiliary metabolic genes, or AMGs for short) that do not only improve bacterial survival but could also boost the expression of plant growth-promoting functions.

In this project, we will use a highly trackable tomato rhizosphere model system to directly study if phages can boost plant growth by interacting with rhizosphere bacterial communities in the plant roots. Specifically, we will focus on understanding the importance of three key mechanisms of phage-mediated plant growth-promotion: i Release of nutrients in the rhizosphere due to the killing of bacteria by phages, ii Selective enrichment of plant growth-promoting bacteria in the rhizosphere by phages, and iii Provisioning of bacteria with plant growth-promoting functional genes by temperate phages.

We are seeking a highly motivated and enthusiastic postdoctoral researcher with experience in molecular virology, microbiology and metagenomics/metaviromics to join our international team. The candidate should hold PhD degree in microbiology, bioinformatics or related field, and good written and verbal communication skills in English are necessary. The postdoctoral position is for 4 years starting in April 2026.

Requirements

• Doctoral degree in molecular biology, microbiology, genetics, bioinformatics or another relevant field. The degree requirement (doctoral degree) must be met by the beginning of the employment.
• Experience in bioinformatics and metagenomic and/or metaviromic analyses. Experience or knowledge in plant biology/pathology, plant-microbe interactions, microbial ecology, evolution or phage biology are desirable.
• Ability to conceive, execute, and complete research projects independently.
• Creativity and good group-working skills.
• Excellent written and verbal communication skills in English.

What we offer

• Competitive salary, high-quality local infrastructure and a top-level interdisciplinary and international collaboration network.
• State-of-art computational resources from the Finnish IT Center for Science (CSC).
• Additional training for microbial bioinformatics and plant pathology (if needed).
• Possibility to visit collaborators at the Nanjing Agricultural University, and other Universities, depending on training needs and candidate preferences.
• Supportive and non-discriminative working environment.

The salary of the postdoctoral researcher will be based on level 5 of the demands level chart for teaching and research personnel in the salary system of Finnish universities. In addition, the appointee will be paid a salary component based on personal performance. The starting salary of the postdoctoral researcher will be ca. 3600-3800 euros/month, depending on the appointees’ qualifications and experience. A six-month trial period will be applied. The workplace of the position is in Helsinki, Finland.

How to apply

Please submit your application as a single pdf file in English using the University of Helsinki Recruitment System. Please include the following in your application:

• A motivation letter (max. 2 pages) including descriptions of the candidate’s: background and methodological skills relevant for the position, research interest or a vision for the research conducted in this position, past experience on working in multidisciplinary groups or research environments
• CV that includes a list of publications
• Names and contact details of two referees

External applicants, please submit your application using the University of Helsinki Recruitment System via Apply Now button.

Applicants who have a helsinki.fi -username and a valid employment contract, a grant researcher’s contract or a visiting researcher’s contract at the University of Helsinki are requested to leave their application by using the Employee login.

The deadline for the applications is 2.2.2026 (at 23.59 EET), while the preferred start date is the 1.4.2026.

Further information

• The position: Professor Ville-Petri Friman (ville-petri.friman@helsinki.fi)
• University of Helsinki recruitment system: HR Specialist Mirkka Juntunen (via HR Services uni-help@helsinki.fi)