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ABSTRACT

The domestication of forest trees for a more sustainable fiber bioeconomy has long been hindered by the complexity and plasticity of lignin, a biopolymer in wood that is recalcitrant to chemical and enzymatic degradation. Here, we show that multiplex CRISPR editing enables precise woody feedstock design for combinatorial improvement of lignin composition and wood properties. By assessing every possible combination of 69,123 multigenic editing strategies for 21 lignin biosynthesis genes, we deduced seven different genome editing strategies targeting the concurrent alteration of up to six genes and produced 174 edited poplar variants. CRISPR editing increased the wood carbohydrate-to-lignin ratio up to 228% that of wild type, leading to more-efficient fiber pulping. The edited wood alleviates a major fiber-production bottleneck regardless of changes in tree growth rate and could bring unprecedented operational efficiencies, bioeconomic opportunities, and environmental benefits. Description Editor’s summary Trees provide an important natural resource, but breeding for optimal wood properties is time consuming and hindered by the complexity of tree genetics and diversity. Sulis et al. show that CRISPR technologies can be readily deployed to enhance wood properties and augment the sustainability of forest trees (see the Perspective by Zuin Zeidler). The authors generated multiplexed genetic alterations modifying wood composition in poplar with more desirable traits for fiber pulping and lower carbon emissions. This work demonstrates that genome editing can be harnessed for breeding more efficient trees, which will provide timely opportunities for sustainable forestry and a more efficient bioeconomy. —DJ Gene editing enables precise woody-feedstock design to enhance fiber production efficiency and sustainability in poplar trees.

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