Profiles

Aleksandra Losvik

Aleksandra Losvik

Doktorand

Visa sidan på svenska
Works at Department of Ecology, Environment and Plant Sciences
Telephone 08-16 37 56
Email aleksandra.losvik@su.se
Visiting address Svante Arrhenius väg 20 A
Room N404
Postal address Institutionen för ekologi miljö och botanik 106 91 Stockholm

About me

I am a PhD student in professor Lisbeth Jonsson's research group. I completed my Master's degree project in 2009 in Poland at the Intercollegiate Faculty of Biotechnology at the University of Gdańsk and Medical University of Gdańsk (https://en.biotech.ug.edu.pl/) where I worked on antibiotic properties of extracts from carnivorous plants.

Teaching

I have been working as a teaching assistant at the basic- and advanced-level Plant Physiology courses and during Molecular Plant-Microbe Interactions advanced course, held at Stockholm University. I was also involved in managing short-term individual projects as well as Master's thesis research projects.

Research

My research focuses on plant-aphid interactions and finding aphid resistant factors in plants. Untill now we were able to identify and characterize two genes in barley, CI2c encoding for protease inhibitor and LOX2.2 encoding for lipoxygenase, both shown to improvie plant resistance against aphids.

Publications

A selection from Stockholm University publication database
  • 2017. Aleksandra Losvik (et al.). International Journal of Molecular Sciences 18 (6)

    Aphids are phloem feeders that cause large damage globally as pest insects. They induce a variety of responses in the host plant, but not much is known about which responses are promoting or inhibiting aphid performance. Here, we investigated whether one of the responses induced in barley by the cereal aphid, bird cherry-oat aphid (Rhopalosiphum padi L.) affects aphid performance in the model plant Arabidopsis thaliana L. A barley cDNA encoding the protease inhibitor CI2c was expressed in A. thaliana and aphid performance was studied using the generalist green peach aphid (Myzus persicae Sulzer). There were no consistent effects on aphid settling or preference or on parameters of life span and long-term fecundity. However, short-term tests with apterous adult aphids showed lower fecundity on three of the transgenic lines, as compared to on control plants. This effect was transient, observed on days 5 to 7, but not later. The results suggest that the protease inhibitor is taken up from the tissue during probing and weakly inhibits fecundity by an unknown mechanism. The study shows that a protease inhibitor induced in barley by an essentially monocot specialist aphid can inhibit a generalist aphid in transgenic Arabidopsis.

Show all publications by Aleksandra Losvik at Stockholm University

Last updated: January 23, 2018

Bookmark and share Tell a friend