Journal
SCIENCE
Volume 350, Issue 6257, Pages 198-203Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac7446
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Funding
- CREATE grant
- Discovery grant
- Canadian Natural Sciences and Engineering Research Council
- NSF [MCB-1158372]
- Japan Society for the Promotion of Science KAKENHI [24114002, 25291062]
- Grants-in-Aid for Scientific Research [24114002, 24114001] Funding Source: KAKEN
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1158372] Funding Source: National Science Foundation
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Cellulose biosynthesis in plant secondary cell walls forms the basis of vascular development in land plants, with xylem tissues constituting the vast majority of terrestrial biomass. We used plant lines that contained an inducible master transcription factor controlling xylem cell fate to quantitatively image fluorescently tagged cellulose synthase enzymes during cellulose deposition in living protoxylem cells. The formation of secondary cell wall thickenings was associated with a redistribution and enrichment of CESA7-containing cellulose synthase complexes (CSCs) into narrow membrane domains. The velocities of secondary cell wall-specific CSCs were faster than those of primary cell wall CSCs during abundant cellulose production. Dynamic intracellular trafficking of endomembranes in combination with increased velocity and high density of CSCs, enables cellulose to be synthesized rapidly in secondary cell walls.
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