1. Effect of temperature drop on shoot elongation and hormone balance Temperature drop reduces shoot elongation, which are the underlying mechanisms? Master work: –Study how gibberellin, auxin and brassinosteroid interact in control of shoot elongation by temperature drop –Do temperature drop in light and darkness affect the hormone balance differently? Methods: –growth studies, mutants, hormone studies, molecular work Contact person : Prof. Jorunn E. Olsen

2. Effect of temperature alternations on shoot elongation Environmentally and health friendly control of shoot elongation - energy saving in greenhouses Master work: –When in the diurnal cycle do plants exhibit highest – lowest sensitivity to temperature alternations? –Which are the mechanisms underlying the responses? Methods: –growth experiments (transducers), wild type and mutants, hormone studies, molecular work possible Arabidopsis thalianaPea (Pisum sativum) Contact person : Prof. Jorunn E. Olsen

3. Effect of light quality on hormonal control of shoot elongation in Poinsettia LED light – different light qualities Master work: –how does light quality affect shoot elongation and hormonal control? Methods: –growth experiments, hormone physiology studies Contact persons : Prof. Jorunn E. Olsen, Assoc. Prof. Sissel Torre

4. Control of shoot elongation in Poinsettia by changing the expression of genes in gibberellin metabolism Control of shoot elongation essential in Poinsettia culture. Can harmful growth retardants be replaced? Master work: –Change expression of genes in gibberellin metabolism Methods: –Molecular biology/biotechnology From labels of growth retardants Contact person : Prof. Jorunn E. Olsen, cooperation with Dr. Jihong Clarke, Bioforsk

5. Climatic adaptation in trees – Effects of light- temperature ineraction on light receptor localisation/ action Daylength control of growth cessation/dormancy cycling appears to be modified by temperature. Master work: –Study whether a temperature modification of daylength response is linked to modification of phytochrome localisation in cells or phytochrome action Methods: –Microscopy of Norway spruce material with phytochromes with fluorescent label (GFP). –Possible also with studies of expression of climatically regulated genes Contact person : Prof. Jorunn E. Olsen