Plant growth depends on intracellular and extracellular variables and their linkage, mediated by the cell membrane. Studying various organisms, e.g. autotroph and heterotroph cell cultures of Chenopodium and larvae of Tenebrio, our analyses involve arthropod plant interactions, plant biochemistry, cell physiology, membrane biology, olfactometry and statistics. Global warming causes various environmental stresses reducing plant growth. Thus, we are interested in plant cell responses to salt and hyper-osmotic stress, heat stress and insect biotic stress. The later can be mediated by compounds of the digested insect surface, the so-called elicitors, i.e. chitosans. Our olfactometry analysis of the negative feed-back of plant cells to chitosans revealed an interesting repellent activity (Fig. 1). Since the very efficient synthetic repellent N,N-diethyl-meta-toluamide (DEET) can affect human health, the enhancement and quantification of repellent activity in Chenopodium cells may represent a promising alternative. Multivariate analysis of proton flux in plant cell suspensions after salt stress and metabolite sensing is a further topic. The effects of salt stress, hyper-osmotic stress, ion channel inhibitors, salt stress modulator proline, amino acids, carboxylic acids and plant growth regulators characterize five principal components of extracellular proton flux. A component depending on the antagonistic regulation by ɣ-aminobutyric acid (GABA) and salicylic acid indicates a function of acid sensing ion channels (ASICs) in salt stress sensing. The extreme temperature-dependence of proton flux and its linkage to responses of the actin cytoskeleton are part of this field of research. Our new focus is urban biology in Bangkok (Anchalee Chaidee, Chulalongkorn University, Bangkok), Phayao (Chatchawal Wongchai, University Phayao) and Salzburg (Wolfgang Pfeiffer) in collaboration with Ilse Foissner (Division of Cellular Dynamics, Universität Salzburg). There, relationships between agriculture in paddy fields and mosquito control are of special interest. In total, we design analytical and practical tools for the improvement of living conditions in urban areas of developing countries. Especially, we search for the proof of principle at the organismic level, e.g. repellency (Fig. 1).

Barrierefreiheit: Kurzbeschreibung des Bildes
Fig. 1 Olfactometry method described by Wongchai C, Chaidee A, Pfeiffer W (2013) Arthropod-Plant Interactions 7: 69-82.

  • News
    As a result of the current situation the updated opening times for Salzburg University library will apply from the 17th November 2020.
    A study carried out by the sleep laboratory of the Faculty of Natural Sciences on the topic of sleep under the direction Prof. Dr. Manuel Schabus is dedicated to the changes in sleep during the Covid-19 lockdown in 6 different countries (Ö, AT, UK, GR, CU, BRA). The fear, which is worrying from a psychological point of view, and which is evident across society, is also reflected in this data: 78% of those surveyed feel threatened or worried by the Covid-19 pandemic.
    Online lecture on the subject of physiology or medicine: November 25, 2020 - 6 p.m. The 2020 Nobel Prize in Physiology or Medicine will go to Harvey J. Alter, Michael Houghton and Charles M. Rice for the discovery of the hepatitis C virus.
    A Pongauer by birth takes on the endowed professorship for human-computer interaction at the University of Salzburg - an interview with the researcher.
    Online lecture on chemistry: December 2nd 2020 - 6 p.m. Emmanuelle Charpentier and Jennifer Doudna received the 2020 Nobel Prize in Chemistry for the discovery of one of the sharpest tools in genetic engineering: the CRISPR / Cas9 genetic scissors. With this technology, researchers can modify the DNA of animals, plants and microorganisms with extremely high precision.
    In many countries the financial resources for investigative journalism are drying up noticeably. The CoViD-19 crisis has accelerated this trend. Smart media policy and public service media can effectively curb erosion.
    The PLUS Report 2020 has been published.
    Digitization has led to an enormous spread of different forms of mobile working. Corona has brought an additional boost and has introduced home office in areas and for activities that were previously unimaginable.
    During the time of Corona, in particular, it became clear just how important it is to support students digitally in their every day university life. The project „On Track“ – stay on track combines digital and social worlds. It is starting at the right time!
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  • 25.11.20 Nobelpreise 2020 - MEDIZIN (Hepatitis)
    26.11.20 Current research from the FB Psychology … related to COVID-19
    27.11.20 Update Immobilienertragsteuer sowie neue Grunderwerbsteuer und Gerichtsgebühren (ganztägig)
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