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 SweTree Technologies identifies genes influencing wood composition, fiber dimensions and biomass growth in trees. We currently test 300 genes annually. These genes are mainly selected on gene expression data from the growth zones of trees.
Increase fiber and biomass growth.
From our in-house research on fiber dimension and biomass we have identified a number of genes that, with altered gene expression, greatly increase growth and fiber length in trees.
From our collaboration with the Woodheads researchers we are further developing a technology where over-expression of GA-20 Oxidase increases the length and number of fibers in woody plants.
- These technologies will provide new transgenic trees that can grow taller and faster. We will develop trees with increased fiber length and stem biomass. Presently, we focus on poplar, eucalyptus and spruce.
A key gene involved in biomass growth comes from our collaboration with Mendel Biotechnology Inc. This company has an expert understanding of the function of plant transcription factors and has identified a gene, which, when over-expressed, gives increased biomass production in several plant species.
- This gene is present in poplar and other trees and has, in our first tests in poplar, shown a profound influence on biomass.
 Improve wood properties.
Through our in-house research we have identified a number of genes that, when gene expression is altered, can influence wood composition, such as strongly change the Klason lignin levels in trees.
We are also developing a technology, emanating from a Woodheads researcher, where a reduction in Pectin Methyl Esterase (PME) levels can produce trees with increased fibre length and improved pulping properties. PME is an enzyme involved in the de-methylation of pectin. We have discovered that a decrease in the PME activity increases the methylation of pectin, resulting in an easier extraction of lignin. The PME technology can also be used to produce trees with increased fiber length, improving paper strength and pulping properties.
- This technology can provide trees with more easily extractable lignin content. At the same time, it decreases the costs for delignification, maintains the same energy content in the lignin and increases the fiber length.
- These trees are also being tested for improved bioenergy properties, such as easier hydrolysis of the sugar polymers for subsequent production of ethanol.
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