Siv Lene Gangenes Skar

Research Scientist

(+47) 934 13 908


Visiting address
Reddalsveien 215, 4886 Grimstad


Graduated from NLH Norwegian Agricultureal University in Ås (now: NMBU) study field horticulture, content within plant production, plant physiology, biochemistry and tissue culture / in vitro progagation. The Master's thesis investigated plant growth and developmental plant physiology in regulated climate, consisting plant growth changes under different colors on artificial growth light. Different length of light waves were given, to give an external influence on the plant material. In the test setup, self-cultivated tissue in-vitro propagated mini-plants of Begonia x Cheimantha were used. 
Working in projects with topic of aquaponics, bioproduction with plants, new production systems, international networking, urban farming, plant physiology, building capacity and innovation.  

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Abstract Two field trials are reported on Jerusalem artichoke (Helianthus tuberosus L.). Firstly, twenty genetic variants were compared with respect to crop yield, morphology and content of sugars and FOS in order to find genotypes suitable for Norwegian production. The highest yield and highest number of tubers per plant was obtained in early flowering variants, e.g. the white variant ‘Tysnes" gave 1.72 kg tubers per plant (28.7 t haa-1). Such early variants had markedly lower portion of smooth tubers. Late variants gave the most preferable tuber shape, but the yield was only half of the most productive ones. Dry matter content (%DM) varied from 19.67 to 23.33. Only a weak correlation was found between dry matter content and total content of FOS (r = 0.255) in the tubers. The mean content of FOS including sucrose through all variants was found to be 11.6 g 100g-1 FW or 55.0 g 100g-1 DW by measurement of non-hydrolyzed plant. Average chain length of FOS in the tubers was found to be DP3.9. There was no difference in tuber FOS content between flowering and non flowering variants. A second trial investigated the above ground part of one flowering and two late or non flowering variants during the growing season. Highest biomass was found for the late or non flowering variants when harvested in September. Total dry matter at time of harvest were found to be 0.21, 0.55 and 0,44 kg plant-1 for the variants ‘Dagnoytral", ‘Elverum" and ‘Krogerup" respectively (5.4, 14.1 and 11.3 t haa-1). At time of harvest stalks of ‘Elverum" and ‘Krogerup" contained 1.25 and 0.77 % fructose (DM) and 3.40 and 1.91 % sucrose. The content of soluble carbohydrates was found to be highest in stalks in August (sucrose and FOS major compounds).