Fructokinase is required for carbon partitioning to cellulose in aspen wood
2012 (English)In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 70, no 6, 967-977 p.Article in journal (Refereed) Published
Sucrose is the main transported form of carbon in several plant species, including Populus species. Sucrose metabolism in developing wood has therefore a central role in carbon partitioning to stem biomass. Half of the sucrose-derived carbon is in the form of fructose, but metabolism of fructose has received little attention as a factor in carbon partitioning to walls of wood cells. We show that RNAi-mediated reduction of FRK2 activity in developing wood of hybrid aspen (Populus tremula × tremuloides) led to the accumulation of soluble neutral sugars and a decrease in hexose phosphates and UDP-glucose, indicating that carbon flux to cell-wall polysaccharide precursors is decreased. Reduced FRK2 activity also led to thinner fiber cell walls with a reduction in the proportion of cellulose. No pleiotropic effects on stem height or diameter were observed. The results establish a central role for FRK2 activity in carbon flux to wood cellulose.
Place, publisher, year, edition, pages
2012. Vol. 70, no 6, 967-977 p.
IdentifiersURN: urn:nbn:se:umu:diva-54416DOI: 10.1111/j.1365-313X.2012.04929.xISI: 000305120400006PubMedID: 22288715OAI: oai:DiVA.org:umu-54416DiVA: diva2:523737