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

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 thaliana Pea (Pisum sativum)

Contact person : Prof. Jorunn E. Olsen

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

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 ofgrowth retardants

Contact person : Prof. Jorunn E. Olsen, cooperation with Dr. Jihong Clarke, Bioforsk

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