Hanna Susi


Description of research and teaching

Background and research interests

My main interest is to study pathogens in natural plant populations. I did my master’s thesis in plant virology and studied viruses on wild raspberries. I have background in horticulture, but during the master project I became enthused about molecular biology.

I started working in the Metapopulation Research Group in 2010 under supervision of Anna-Liisa Laine. In my PhD project I focus on within host competition of the pathogen strains in Plantago lanceolata –Podosphaera plantaginis system. I am interested in multiple pathogen genotypes infecting the same host. How different strains of the pathogen compete for the limited host’s resources and what is the outcome of competition, do more infective or sporulating strains take over the competition. Does the competitive success of the pathogen against other strains lead to increased virulence or transmission efficiency? Pathogen performance under multiple infection may also depend on the interaction between pathogen strains. Do the pathogens co-infect the host or does one pathogen exclude others leading to superinfection?

To understand the whole picture of within host competition, also the host responses need to be considered. The outcome of multiple infection may be mediated by the chemical defense reactions of the host primed by the first infection of the host. It is well-known that pathogens and herbivores induce a resistance reaction in the plant tissues. The reaction is systemic inducing a signaling cascade between the plants cells spreading the reaction the whole plant. Primed resistance is assumed to be costly for the host and there is limited data available on how durable this phenomenon is in field conditions and how much it will delay the spread of the pathogens. My aim is to test if the induced resistance occurs in the Plantago-Podosphaera system and how long it lasts. I will test if there is variation in the duration of the induced resistance between different strains and how does the transmission efficiency or infectivity of the pathogen affect the ability to induce systemic resistance.


Latest publications

  1. Molecular detection and characterisation of black raspberry necrosis virus and raspberry bushy dwarf virus isolates in wild raspberries

    Susi, H., Rajamäki, M. L., Artola, K., Jayaraj-Mallika, F. R. & Valkonen, J. P. T., Sep 2018, In : Annals of Applied Biology. 173, 2, p. 97-111 15 p.

    Research output: Contribution to journalArticleScientificpeer-review

  2. Local demographic and epidemiological patterns in the Linum marginale-Melampsora lini association: a multi-year study

    Susi, H., Thrall, P. H., Barrett, L. G. & Burdon, J. J., Sep 2017, In : Journal of Ecology. 105, 5, p. 1399-1412 14 p.

    Research output: Contribution to journalArticleScientificpeer-review

  3. Host resistance and pathogen aggressiveness are key determinants of coinfection in the wild

    Susi, H. & Laine, A-L., Aug 2017, In : Evolution. 71, 8, p. 2110-2119 10 p.

    Research output: Contribution to journalArticleScientificpeer-review

View all (12) »

Latest activities

  1. XVth ESEB Meeting

    Hanna Susi (Speaker: Presenter)
    9 Aug 201514 Aug 2015

    Activity: Participating in or organising an event typesPublic Talks

  2. CIRAD Montpellier

    Hanna Susi (Visiting researcher)
    17 May 201522 May 2015

    Activity: Visiting an external institution typesAcademic visit to other institution

  3. Finnish National Ecology Meeting

    Hanna Susi (Speaker: Presenter)
    10 Feb 201511 Feb 2015

    Activity: Participating in or organising an event typesPublic Talks

View all (17) »

ID: 9144586