What is it about?
Woody biomass has gained popularity as an environmentally friendly, renewable and sustainable resource for liquid fuel production. Here, we demonstrate biotechnological improvement of the quantity and quality of woody biomass by employing wood tissue-preferential production of gibberellin (GA), a plant hormone that positively regulates stem growth.
Why is it important?
In this study, we produced and characterized transgenic Arabidopsis and poplar plants expressing gibberellin-20 oxidase (GA20ox) gene isolated from Pinus densiflora (PdGA20ox1) under the control of either a 35S promoter or a wood tissue-specific promoter (DX15). Previously, PdGA20ox1 was successfully demonstrated to be an important candidate gene for accelerated stem growth. The DX15 promoter was isolated from a gene encoding FASCICLIN-like arabinogalactan protein in Populus trichocarpa, which is specifically and strongly expressed in developing xylem tissue (i.e., wood). Here, we provide experimental evidence that controlled production of GAs through a DX15 promoter can be utilized as an efficient biotechnological tool for producing enhanced plant biomass, minimizing undesirable effects.
The following have contributed to this page: Professor Jae-Heung Ko
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